When we apply pressure on toothpaste tube, the toothpaste comes out due to the principle of:
Gravity
Inertia
Buoyancy
Pascal's law
Answer: d) Pascal's law
Which type of mirror is used in rear-view mirrors of vehicles?
Concave mirror
Convex mirror
Plane mirror
Spherical mirror
Answer: b) Convex mirror
The process of converting sunlight into electrical energy using
photovoltaic cells is known as:
Solar heating
Solar radiation
Solar power
Solar photovoltaics
Answer: d) Solar photovoltaics
When a glass rod is rubbed with a piece of silk cloth, it acquires an
electric charge. This phenomenon is known as:
Conduction
Induction
Electromagnetism
Static electricity
Answer: d) Static electricity
Which type of energy is possessed by an object when it is at rest?
Potential energy
Kinetic energy
Thermal energy
Chemical energy
Answer: a) Potential energy
Which substance is commonly used to put out small fires?
Water
Sand
Carbon dioxide
Fire extinguisher
Answer: a) Water
The process of boiling water is an example of:
Evaporation
Condensation
Sublimation
Melting
Answer: b) Condensation
Which phenomenon is responsible for the formation of rainbows?
Refraction
Reflection
Dispersion
Diffraction
Answer: c) Dispersion
Which device is used to measure atmospheric pressure?
Barometer
Thermometer
Hydrometer
Anemometer
Answer: a) Barometer
Why does an ice cube float in water?
Ice is lighter than water
Ice is denser than water
Ice is less buoyant than water
Ice is more buoyant than water
Answer: d) Ice is more buoyant than water
The process of converting a solid directly into a gas without passing
through the liquid state is called:
Sublimation
Evaporation
Condensation
Melting
Answer: a) Sublimation
What causes the tides in the oceans?
Rotation of the Earth
Gravitational pull of the Moon
Gravitational pull of the Sun
Earth's magnetic field
Answer: b) Gravitational pull of the Moon
Which gas is essential for the process of respiration in humans and
other animals?
Oxygen
Nitrogen
Carbon dioxide
Hydrogen
Answer: a) Oxygen
When a glass of cold water is left in a warm room, water droplets form
on the outside of the glass. This is due to:
Evaporation
Condensation
Sublimation
Melting
Answer: b) Condensation
What causes the sensation of heat when we touch a hot object?
Conduction
Convection
Radiation
Insulation
Answer: a) Conduction
Which gas is responsible for the characteristic smell of rotten eggs?
Oxygen
Nitrogen
Carbon dioxide
Hydrogen sulfide
Answer: d) Hydrogen sulfide
What causes the sound of thunder during a thunderstorm?
Lightning
Rainfall
Wind
Cloud formation
Answer: a) Lightning
Which type of lens is used in corrective eyeglasses for nearsightedness?
Convex lens
Concave lens
Bifocal lens
Plano lens
Answer: b) Concave lens
What is the process of plants converting sunlight into energy known as?
Photosynthesis
Respiration
Transpiration
Germination
Answer: a) Photosynthesis
Which property of a material allows it to be stretched or deformed under
stress?
Elasticity
Density
Hardness
Conductivity
Answer: a) Elasticity
What causes the phenomenon of a rainbow?
Reflection of light
Refraction of light
Diffraction of light
Dispersion of light
Answer: d) Dispersion of light
Which type of energy is associated with the motion of an object?
Potential energy
Kinetic energy
Thermal energy
Chemical energy
Answer: b) Kinetic energy
Why does a metal spoon feel colder than a wooden spoon when left in a
cup of hot water?
Metal conducts heat better than wood
Metal has a lower specific heat
capacity than wood
Metal absorbs more heat than wood
Metal has a higher thermal
conductivity than wood
Answer: d) Metal has a higher thermal conductivity than wood
What causes the seasons on Earth?
Tilt of the Earth's axis
Rotation of the Earth
Revolution around the Sun
Gravitational pull of the Moon
Answer: a) Tilt of the Earth's axis
Why does a can of carbonated soda fizz when opened?
Release of pressure
Chemical reaction
Introduction of air
Increase in temperature
Answer: a) Release of pressure
What is the process of a liquid changing into a gas at the surface called?
Evaporation
Condensation
Sublimation
Boiling
Answer: a) Evaporation
Which gas is essential for the process of combustion?
Oxygen
Nitrogen
Carbon dioxide
Hydrogen
Answer: a) Oxygen
What causes the phenomenon of auroras in the Earth's atmosphere?
Solar wind particles interacting with
the magnetic field
Refraction of light through ice
crystals
Scattering of sunlight by atmospheric
particles
Reflection of moonlight from the
Earth's surface
Answer: a) Solar wind particles interacting with the magnetic field
Why do objects immersed in water appear to be displaced?
Due to buoyancy
Due to refraction
Due to reflection
Due to absorption
Answer: b) Due to refraction
Which gas is released during the process of respiration in living
organisms?
Oxygen
Nitrogen
Carbon dioxide
Hydrogen peroxide
Answer: c) Carbon dioxide
What is the reason behind the formation of dew on the grass in the
morning?
Condensation of water vapor in the air
Evaporation of water from the grass
Sublimation of ice particles
Precipitation from the clouds
Answer: a) Condensation of water vapor in the air
Why do metal objects feel colder than wooden objects at room temperature?
Metals have a lower specific heat
capacity than wood
Metals conduct heat better than wood
Metals have a higher thermal
conductivity than wood
Metals have a higher boiling point
than wood
Answer: c) Metals have a higher thermal conductivity than wood
Why do we see our reflection in a mirror?
Due to the absorption of light
Due to the transmission of light
Due to the scattering of light
Due to the reflection of light
Answer: d) Due to the reflection of light
What causes the formation of fog?
Condensation of water vapor near the
ground
Evaporation of water from lakes and
rivers
Sublimation of ice particles in the
air
Precipitation from the clouds
Answer: a) Condensation of water vapor near the ground
Why does a glass of cold water appear to "sweat" on a hot day?
Due to the absorption of water from
the surroundings
Due to the evaporation of water from
the glass
Due to the condensation of water vapor
in the air
Due to the melting of ice inside the
glass
Answer: c) Due to the condensation of water vapor in the air
Why does a balloon stick to a wall after rubbing it against hair?
Due to the static electricity buildup
on the balloon
Due to magnetic attraction between the
balloon and the wall
Due to the buoyant force acting on the
balloon
Due to the adhesive properties of the
balloon
Answer: a) Due to the static electricity buildup on the balloon
Why does a metal spoon feel hotter than a wooden spoon when left in a
cup of hot water?
Metals have a lower specific heat
capacity than wood
Metals conduct heat better than wood
Metals absorb more heat than wood
Metals have a higher boiling point
than wood
Answer: b) Metals conduct heat better than wood
What causes the ringing sound when a metal spoon hits a glass?
Vibrations in the metal spoon
Vibrations in the glass
Resonance between the spoon and the
glass
Absorption of sound waves
Answer: c) Resonance between the spoon and the glass
Why does adding salt to water lower its freezing point?
Salt decreases the density of water
Salt increases the viscosity of water
Salt increases the boiling point of
water
Salt disrupts the formation of ice
crystals
Answer: d) Salt disrupts the formation of ice crystals
Why do we see colors in a soap bubble?
Due to the reflection of light
Due to the absorption of light
Due to the scattering of light
Due to the refraction of light
Answer: d) Due to the refraction of light
Why does a metal spoon feel hotter than a plastic spoon when both are
placed in hot soup?
Metals have a higher specific heat
capacity than plastic
Metals conduct heat better than
plastic
Metals have a higher boiling point
than plastic
Metals have a higher thermal expansion
coefficient than plastic
Answer: b) Metals conduct heat better than plastic
Why does a glass crack when hot liquid is poured into it?
Glass contracts when heated
Glass expands when heated
Glass is a poor conductor of heat
Glass is more brittle when heated
Answer: b) Glass expands when heated
Why does oil float on water?
Oil is less dense than water
Oil is more viscous than water
Oil is less adhesive than water
Oil has a lower boiling point than
water
Answer: a) Oil is less dense than water
Why does a balloon inflate when air is blown into it?
Air pressure inside the balloon
increases
Air molecules escape from the balloon
The balloon material expands upon
contact with air
The balloon material contracts upon
contact with air
Answer: a) Air pressure inside the balloon increases
Why does a magnet attract certain objects?
Due to the flow of electricity through
the magnet
Due to the repulsion of magnetic
fields
Due to the alignment of magnetic
domains in the object
Due to the release of magnetic energy
from the magnet
Answer: c) Due to the alignment of magnetic domains in the object
Why does a pencil appear bent when placed in a glass of water?
Due to the refraction of light
Due to the reflection of light
Due to the absorption of light
Due to the scattering of light
Answer: a) Due to the refraction of light
Why does an ice cube melt faster in warm water than in cold water?
Warm water has a higher density than
cold water
Warm water has a lower specific heat
capacity than cold water
Warm water transfers heat more rapidly
than cold water
Warm water has a higher boiling point
than cold water
Answer: c) Warm water transfers heat more rapidly than cold water
Why does a car skid on a wet road?
Due to the reduced friction between
the tires and the road
Due to the increased friction between
the tires and the road
Due to the change in tire pressure on
a wet surface
Due to the change in engine
performance on a wet surface
Answer: a) Due to the reduced friction between the tires and the road
Why does a metal spoon feel colder than a plastic spoon at room
temperature?
Metals have a higher specific heat
capacity than plastic
Metals conduct heat better than
plastic
Metals have a higher boiling point
than plastic
Metals have a higher thermal expansion
coefficient than plastic
Answer: b) Metals conduct heat better than plastic
Why does a fire need oxygen to burn?
Oxygen is a combustible gas
Oxygen supports the chemical reactions
that produce fire
Oxygen cools down the temperature of
the fire
Oxygen blocks the supply of fuel to
the fire
Answer: b) Oxygen supports the chemical reactions that produce fire
Why do we see lightning before hearing thunder during a thunderstorm?
Light travels faster than sound
Thunder is produced before lightning
Sound travels faster than light
Thunder and lightning occur
simultaneously
Answer: a) Light travels faster than sound
Why does a glass crack when hot liquid is poured into it?
Glass contracts when heated
Glass expands when heated
Glass is a poor conductor of heat
Glass is more brittle when heated
Answer: b) Glass expands when heated
Why do we see a rainbow after rain showers?
Water droplets in the air refract and
disperse sunlight
Water droplets in the air reflect
sunlight
Water droplets in the air absorb
sunlight
Water droplets in the air emit their
own light
Answer: a) Water droplets in the air refract and disperse sunlight
Why does a balloon stick to a wall after rubbing it against hair?
Due to the static electricity buildup
on the balloon
Due to magnetic attraction between the
balloon and the wall
Due to the adhesive properties of the
balloon
Due to the buoyant force acting on the
balloon
Answer: a) Due to the static electricity buildup on the balloon
Why does an apple turn brown when cut and exposed to air?
The apple oxidizes in the presence of
oxygen
The apple absorbs moisture from the
air
The apple releases enzymes that cause
discoloration
The apple reacts with sunlight
Answer: a) The apple oxidizes in the presence of oxygen
Why does a metal spoon feel hotter than a wooden spoon when left in a
cup of hot liquid?
Metals have a higher specific heat
capacity than wood
Metals conduct heat better than wood
Metals absorb more heat than wood
Metals have a higher thermal expansion
coefficient than wood
Answer: b) Metals conduct heat better than wood
Why does a ball bounce when dropped on the ground?
Due to the conservation of momentum
Due to the conservation of energy
Due to the elasticity of the ball
Due to the friction between the ball
and the ground
Answer: c) Due to the elasticity of the ball
Why does a camera use a lens to focus an image?
To increase the size of the image
To decrease the size of the image
To correct the color of the image
To bring the image into focus on the
film or sensor
Answer: d) To bring the image into focus on the film or sensor
Why do we feel lighter when swimming in water compared to standing on
land?
Water exerts an upward buoyant force
on our bodies
Water has a lower density than our
bodies
Water reduces the effects of gravity
Water absorbs our body weight
Answer: a) Water exerts an upward buoyant force on our bodies
Why does a compass needle point towards the Earth's magnetic north pole?
Due to the gravitational force of the
Earth
Due to the alignment of the needle
with Earth's rotation axis
Due to the magnetic properties of the needle
Due to the Earth's magnetic field
Answer: d) Due to the Earth's magnetic field
Why does a metal spoon feel colder than a wooden spoon at room
temperature?
Metals have a higher specific heat
capacity than wood
Metals conduct heat better than wood
Metals have a higher boiling point
than wood
Metals have a higher thermal expansion
coefficient than wood
Answer: b) Metals conduct heat better than wood
Why do objects appear smaller when viewed from a distance?
Due to the refraction of light
Due to the absorption of light
Due to the scattering of light
Due to the perspective effect
Answer: d) Due to the perspective effect
Why does ice float in water?
Ice is less dense than water
Ice has a higher boiling point than
water
Ice has a lower specific heat capacity
than water
Ice has a higher viscosity than water
Answer: a) Ice is less dense than water
Why does a paper towel soak up water?
Due to the cohesive properties of
water
Due to the adhesive properties of
water
Due to the capillary action of water
Due to the density of water
Answer: c) Due to the capillary action of water
Why does a candle flame flicker?
Due to the combustion of wax
Due to the presence of impurities in
the air
Due to the movement of air currents
Due to the melting of the candle wax
Answer: c) Due to the movement of air currents
Why does a bottle of carbonated drink bubble when opened?
Due to the release of carbon dioxide
gas
Due to the presence of dissolved
oxygen
Due to the change in temperature
Due to the interaction of light with
the liquid
Answer: a) Due to the release of carbon dioxide gas
Why do we see a full moon only once a month?
Due to the rotation of the Earth
Due to the revolution of the Moon
around the Earth
Due to the alignment of the Sun,
Earth, and Moon
Due to the scattering of sunlight
Answer: c) Due to the alignment of the Sun, Earth, and Moon
Why do we sweat on a hot day?
To cool down our body temperature
To conserve water in the body
To expel waste products from the body
To maintain electrolyte balance in the
body
Answer: a) To cool down our body temperature
Why does food cook faster in a pressure cooker?
Due to the increased temperature
inside the cooker
Due to the increased humidity inside
the cooker
Due to the reduced pressure inside the
cooker
Due to the increased heat transfer to
the food
Answer: a) Due to the increased temperature inside the cooker
Why do leaves of plants appear green?
Due to the reflection of green light
Due to the absorption of green light
Due to the scattering of green light
Due to the refraction of green light
Answer: b) Due to the absorption of green light
Why does a hot air balloon rise in the sky?
Due to the release of hot air from the
balloon
Due to the weight of the balloon
Due to the force of gravity pulling
the balloon upward
Due to the air pressure inside the
balloon
Answer: a) Due to the release of hot air from the balloon
Why does a can of soda explode when shaken and opened?
Due to the increase in temperature
inside the can
Due to the release of carbon dioxide
gas
Due to the change in atmospheric
pressure
Due to the interaction between light
and the liquid
Answer: b) Due to the release of carbon dioxide gas
Why does a metal spoon feel hot when left in a cup of hot tea?
Metals have a higher specific heat
capacity than tea
Metals conduct heat better than tea
Metals have a higher boiling point
than tea
Metals have a higher density than tea
Answer: b) Metals conduct heat better than tea
Why do we feel lighter when riding in an elevator that is going down?
Due to the decrease in atmospheric
pressure
Due to the decrease in gravitational
force
Due to the decrease in friction
Due to the increase in air resistance
Answer: b) Due to the decrease in gravitational force
Why does a glass crack when hot water is poured into it?
Glass expands when heated
Glass contracts when heated
Glass is a poor conductor of heat
Glass has low elasticity
Answer: a) Glass expands when heated
Why does a fan create a breeze in a room?
Due to the release of cold air from
the fan
Due to the production of static electricity
by the fan
Due to the rotation of the fan blades,
which moves air
Due to the generation of ultrasonic
waves by the fan
Answer: c) Due to the rotation of the fan blades, which moves air
Why do we see a sunset as red or orange?
Due to the reflection of red and
orange light by the atmosphere
Due to the absorption of red and
orange light by the atmosphere
Due to the scattering of red and
orange light by the atmosphere
Due to the refraction of red and
orange light by the atmosphere
Answer: c) Due to the scattering of red and orange light by the
atmosphere
Why does a metal spoon feel cold when left in the refrigerator?
Metals have a lower specific heat
capacity than the refrigerator
Metals conduct cold better than other
materials
Metals have a lower boiling point than
the refrigerator
Metals have low thermal conductivity
Answer: b) Metals conduct cold better than other materials
Why do we see our breath in cold weather?
Due to the release of water vapor from
our breath
Due to the condensation of moisture in
the air
Due to the reflection of light by our
breath
Due to the absorption of light by our
breath
Answer: b) Due to the condensation of moisture in the air
Why does a metal spoon feel hotter than a plastic spoon when both are
placed in hot soup?
Metals have a higher specific heat
capacity than plastic
Metals conduct heat better than
plastic
Metals absorb more heat than plastic
Metals have a higher thermal expansion
coefficient than plastic
Answer: b) Metals conduct heat better than plastic
Why does an ice cube melt faster on a metal plate compared to a wooden
surface?
Metals have a higher specific heat
capacity than wood
Metals conduct heat better than wood
Metals have a lower density than wood
Metals have a higher boiling point
than wood
Answer: b) Metals conduct heat better than wood
Why does a glass window become foggy when the weather is cold outside?
Due to the condensation of water vapor
on the glass surface
Due to the evaporation of water from
the glass surface
Due to the reflection of light by the
glass
Due to the absorption of heat by the
glass
Answer: a) Due to the condensation of water vapor on the glass surface
Why does a metal spoon feel colder than a plastic spoon at room
temperature?
Metals have a higher specific heat
capacity than plastic
Metals conduct heat better than
plastic
Metals have a lower boiling point than
plastic
Metals have a lower thermal expansion
coefficient than plastic
Answer: b) Metals conduct heat better than plastic
Why does a piece of paper crumple when crushed in the hand?
Due to the force of gravity acting on
the paper
Due to the decrease in air pressure
around the paper
Due to the elastic properties of the
paper
Due to the disruption of the paper's
structure
Answer: d) Due to the disruption of the paper's structure
Why does a car's windshield become foggy in rainy weather?
Due to the evaporation of water from
the windshield
Due to the reflection of light by the
windshield
Due to the absorption of heat by the
windshield
Due to the condensation of water vapor
on the windshield
Answer: d) Due to the condensation of water vapor on the windshield
Why does a ball roll downhill when released from the top?
Due to the force of gravity pulling
the ball downward
Due to the force of friction pushing
the ball forward
Due to the wind pushing the ball in
that direction
Due to the ball's shape and weight
Answer: a) Due to the force of gravity pulling the ball downward
Why does a rubber band stretch when pulled?
Due to the magnetic properties of
rubber
Due to the weight of the rubber band
Due to the elastic properties of
rubber
Due to the friction between the rubber
and the pulling force
Answer: c) Due to the elastic properties of rubber
Why does a person's voice sound different when recorded and played back?
Due to the amplification of sound
waves in the recording
Due to the change in pitch of the
voice
Due to the change in volume of the
voice
Due to the absence of resonance in the
recording
Answer: d) Due to the absence of resonance in the recording
Why does a boat float on water?
Due to the weight of the boat
Due to the force of gravity acting on
the boat
Due to the upward buoyant force
exerted by the water
Due to the density of the boat
Answer: c) Due to the upward buoyant force exerted by the water
Why does a soap bubble burst when touched?
Due to the evaporation of water from
the bubble
Due to the absorption of light by the
bubble
Due to the force applied by the touch
Due to the elasticity of the bubble
membrane
Answer: c) Due to the force applied by the touch
Why does a metal object feel colder than a wooden object at the same
temperature?
Metals have a higher specific heat
capacity than wood
Metals conduct heat better than wood
Metals have a lower density than wood
Metals have a higher boiling point
than wood
Answer: b) Metals conduct heat better than wood
Why does the temperature decrease as you go higher in the atmosphere?
Due to the decrease in air pressure
Due to the increase in solar radiation
Due to the presence of clouds
Due to the absorption of heat by the
ground
Answer: a) Due to the decrease in air pressure
Why does a compass needle point towards the Earth's magnetic north pole?
Due to the presence of iron in the
compass needle
Due to the alignment of the needle
with Earth's magnetic field
Due to the rotation of the Earth
Due to the force of gravity acting on
the needle
Answer: b) Due to the alignment of the needle with Earth's magnetic
field
Why do objects appear blurry when they are out of focus?
Due to the absorption of light by the
objects
Due to the reflection of light by the
objects
Due to the scattering of light by the
objects
Due to the improper alignment of light
rays
Answer: d) Due to the improper alignment of light rays
Why does a balloon stick to a wall after being rubbed against hair?
Due to the static electricity
generated by rubbing
Due to the weight of the balloon
Due to the adhesion between the
balloon and the wall
Due to the absorption of light by the
balloon
Answer: a) Due to the static electricity generated by rubbing
Why does a metal spoon become hot when left in a cup of hot coffee?
Metals have a lower specific heat
capacity than coffee
Metals conduct heat better than coffee
Metals have a higher boiling point
than coffee
Metals have a higher density than
coffee
Answer: b) Metals conduct heat better than coffee
Why does a kite rise in the air when flown?
Due to the force of gravity pulling
the kite upward
Due to the force of friction pushing
the kite forward
Due to the wind pushing the kite in
that direction
Due to the shape and design of the kite
Answer: c) Due to the wind pushing the kite in that direction
Why do we see a rainbow after rainfall?
Due to the reflection of light by
water droplets in the air
Due to the absorption of light by
water droplets in the air
Due to the scattering of light by
water droplets in the air
Due to the refraction of light by
water droplets in the air
Answer: d) Due to the refraction of light by water droplets in the air
Why does a metal spoon feel heavier than a plastic spoon of the same
size?
Metals have a higher specific gravity
than plastic
Metals have a higher boiling point
than plastic
Metals have a higher mass than plastic
Metals have a higher elasticity than
plastic
Answer: c) Metals
Why does a glass of water placed in a room eventually reach the same temperature
as the room?
Due to the absorption of heat by the
glass
Due to the reflection of light by the
glass
Due to the conduction of heat from the
glass to the room
Due to the evaporation of water from
the glass
Answer: c) Due to the conduction of heat from the glass to the room
Why does a person's hair stand up when rubbed with a balloon?
Due to the change in hairstyle caused
by rubbing
Due to the static electricity
generated by rubbing
Due to the weight of the hair
Due to the absorption of light by the hair
Answer: b) Due to the static electricity generated by rubbing
Why does the Moon appear to change its shape (phases) during the month?
Due to the rotation of the Moon on its
axis
Due to the revolution of the Moon
around the Earth
Due to the reflection of sunlight by
the Moon
Due to the absorption of light by the
Moon
Answer: b) Due to the revolution of the Moon around the Earth
Why does a pencil placed in a glass of water appear bent?
Due to the refraction of light by the
water
Due to the absorption of light by the
pencil
Due to the reflection of light by the
pencil
Due to the diffraction of light by the
water
Answer: a) Due to the refraction of light by the water
Why does a metal spoon feel colder than a wooden spoon at the same
temperature?
Metals have a higher specific heat
capacity than wood
Metals conduct heat better than wood
Metals have a higher density than wood
Metals have a higher boiling point
than wood
Answer: b) Metals conduct heat better than wood
Why does a paperclip sink in water while a coin floats?
Paperclip has a higher density than
water, while the coin has a lower density
Paperclip has a lower density than
water, while the coin has a higher density
Paperclip has a higher mass than
water, while the coin has a lower mass
Paperclip has a lower mass than water,
while the coin has a higher mass
Answer: a) Paperclip has a higher density than water, while the coin has
a lower density
Why does a balloon stick to a wall after being rubbed with a cloth?
Due to the gravitational force between
the balloon and the wall
Due to the adhesion between the
balloon and the wall
Due to the static electricity
generated by rubbing
Due to the weight of the balloon
Answer: c) Due to the static electricity generated by rubbing
Why does a metal spoon feel colder than a ceramic spoon at room
temperature?
Metals have a lower specific heat
capacity than ceramics.
Metals conduct heat better than
ceramics.
Metals have a higher boiling point
than ceramics.
Metals have a higher thermal
conductivity than ceramics.
Answer: b) Metals conduct heat better than ceramics.
Why does a soda can feel colder to touch when taken out of a
refrigerator?
Soda has a lower specific heat
capacity than air.
Soda absorbs heat more quickly than
air.
Soda has a higher boiling point than air.
Soda has a lower density than air.
Answer: b) Soda absorbs heat more quickly than air.
Why do clouds form in the sky?
Due to the evaporation of water from
the ground.
Due to the condensation of water vapor
in the air.
Due to the reflection of sunlight by
the atmosphere.
Due to the absorption of light by the
clouds.
Answer: b) Due to the condensation of water vapor in the air.
Why does a metal spoon feel hotter than a plastic spoon when both are
placed in hot water?
Metals have a higher specific heat capacity
than plastic.
Metals conduct heat better than
plastic.
Metals absorb more heat than plastic.
Metals have a higher thermal expansion
coefficient than plastic.
Answer: b) Metals conduct heat better than plastic.
Why does a person's body shiver in cold weather?
To generate heat and keep the body
warm.
Due to the increase in metabolic rate.
To conserve energy.
Due to the decrease in blood
circulation.
Answer: a) To generate heat and keep the body warm.
Why does an apple turn brown when cut and left exposed to air?
Due to the absorption of light by the
apple.
Due to the release of enzymes in the
apple.
Due to the oxidation of compounds in
the apple.
Due to the evaporation of moisture
from the apple.
Answer: c) Due to the oxidation of compounds in the apple.
Why does a balloon stick to a wall after rubbing it against your hair?
Due to the gravitational force between
the balloon and the wall.
Due to the adhesion between the
balloon and the wall.
Due to the static electricity
generated by rubbing.
Due to the weight of the balloon.
Answer: c) Due to the static electricity generated by rubbing.
Why does a car's windshield fog up on a cold day?
Due to the absorption of moisture by
the windshield.
Due to the reflection of light by the
windshield.
Due to the condensation of water vapor
on the windshield.
Due to the evaporation of water from
the windshield.
Answer: c) Due to the condensation of water vapor on the windshield.
Why do leaves appear green in color?
Due to the absorption of green light
by the leaves.
Due to the reflection of green light
by the leaves.
Due to the transmission of green light
through the leaves.
Due to the scattering of green light
by the leaves.
Answer: b) Due to the reflection of green light by the leaves.
Why does a mirror reflect light?
Due to the absorption of light by the
mirror.
Due to the emission of light by the
mirror.
Due to the refraction of light by the
mirror.
Due to the smooth and reflective
surface of the mirror.
Answer: d) Due to the smooth and reflective surface of the mirror.Answer:
a) Due to the conduction of heat from the soup to the spoon
Why does a pencil appear bent when partially immersed in water?
Due to the reflection of light by the
water
Due to the absorption of light by the
pencil
Due to the refraction of light by the
water
Due to the diffraction of light by the
pencil
Answer: c) Due to the refraction of light by the water
Why does a metal spoon feel hotter than a wooden spoon when both are
placed in hot soup?
Metals have a higher specific heat
capacity than wood
Metals conduct heat better than wood
Metals absorb more heat than wood
Metals have a higher thermal expansion
coefficient than wood
Answer: b) Metals conduct heat better than wood
Why does a soda can fizz when opened?
Due to the release of carbon dioxide
gas dissolved in the soda
Due to the increase in pressure inside
the can
Due to the absorption of air by the
soda
Due to the expansion of the soda
caused by heat
Answer: a) Due to the release of carbon dioxide gas dissolved in the
soda
Why does a rainbow have different colors?
Due to the reflection of light by
water droplets in the air
Due to the absorption of light by
water droplets in the air
Due to the scattering of light by
water droplets in the air
Due to the refraction of light by
water droplets in the air
Answer: d) Due to the refraction of light by water droplets in the air
Why does a fire extinguisher spray foam?
Due to the release of compressed air
Due to the chemical reaction between
the foam and fire
Due to the expansion of gas inside the
extinguisher
Due to the force applied to the
extinguisher handle
Answer: a) Due to the release of compressed air
Why does a banana turn yellow as it ripens?
Due to the absorption of sunlight by
the banana
Due to the breakdown of chlorophyll in
the banana
Due to the production of ethylene gas
by the banana
Due to the loss of water from the
banana
Answer: c) Due to the production of ethylene gas by the banana
Why does a clock pendulum keep swinging back and forth?
Due to the force of gravity pulling
the pendulum downward
Due to the friction between the
pendulum and the air
Due to the transfer of energy from the
clock mechanism
Due to the elasticity of the
pendulum's material
Answer: c) Due to the transfer of energy from the clock mechanism
Why does a camera use a lens to focus light?
Due to the absorption of light by the
lens
Due to the reflection of light by the
lens
Due to the refraction of light by the
lens
Due to the diffraction of light by the
lens
Answer: c) Due to the refraction of light by the lens
Why does a plant grow towards the sunlight?
Due to the attraction between the
plant and sunlight
Due to the emission of light by the
plant
Due to the absorption of light by the
plant
Due to the process of photosynthesis
in the plant
Answer: d) Due to the process of photosynthesis in the plant
Why does a magnifying glass make objects
appear larger?
Due to the
reflection of light by the magnifying glass
Due to the
absorption of light by the magnifying glass
Due to the
refraction of light by the magnifying glass
Due to the
diffraction of light by the magnifying glass
Answer: c) Due to the refraction of light
by the magnifying glass
Why does a thermometer use mercury or
alcohol as the working fluid?
Because mercury
and alcohol are easily available.
Because mercury
and alcohol have low boiling points.
Because mercury
and alcohol have high boiling points.
Because mercury
and alcohol expand and contract with temperature changes.
Answer: d) Because mercury and alcohol
expand and contract with temperature changes.
Why does a battery die over time?
Due to the loss
of electrons from the battery.
Due to the
decrease in chemical reactions within the battery.
Due to the
absorption of energy from the surroundings.
Due to the
increase in internal resistance of the battery.
Answer: b) Due to the decrease in chemical
reactions within the battery.
Why does the sound of thunder follow after
the flash of lightning?
Because light
travels faster than sound.
Because thunder
is produced before lightning.
Because
lightning creates a vacuum that produces sound.
Because thunder
is an echo of the lightning.
Answer: a) Because light travels faster
than sound.
Why does an ice cube float in water?
Because ice
cubes are less dense than water.
Because ice
cubes are more dense than water.
Because ice
cubes have a lower boiling point than water.
Because ice
cubes have a higher freezing point than water.
Answer: a) Because ice cubes are less dense
than water.
Why does a radio receive signals from
distant stations?
Because of the
amplification of signals by the radio.
Because of the
reflection of signals by the atmosphere.
Because of the
refraction of signals by the radio antenna.
Because of the
electromagnetic waves transmitted by the stations.
Answer: d) Because of the electromagnetic
waves transmitted by the stations.
Why does a rubber ball bounce higher than a
clay ball?
Because rubber
balls have more mass than clay balls.
Because rubber
balls have a higher elasticity than clay balls.
Because rubber
balls have a lower density than clay balls.
Because rubber
balls have a smoother surface than clay balls.
Answer: b) Because rubber balls have a
higher elasticity than clay balls.
Why does a candle flame flicker?
Due to the
absorption of air by the flame.
Due to the
reflection of light by the flame.
Due to the
conduction of heat by the flame.
Due to the
movement of air around the flame.
Answer: d) Due to the movement of air
around the flame.
Why does a seed need water to germinate?
Because water
provides nutrients to the seed.
Because water
activates enzymes in the seed.
Because water
provides oxygen to the seed.
Because water
protects the seed from pathogens.
Answer: b) Because water activates enzymes
in the seed.
Why does a metal spoon feel colder than a
plastic spoon at room temperature?
Metals have a
higher specific heat capacity than plastic.
Metals conduct
heat better than plastic.
Metals have a
lower boiling point than plastic.
Metals have a
lower thermal expansion coefficient than plastic.
Answer: b) Metals conduct heat better than
plastic.
Why does a pencil eraser remove pencil
marks from paper?
Due to the
absorption of pencil marks by the eraser.
Due to the
reflection of pencil marks by the eraser.
Due to the
friction between the eraser and the paper.
Due to the
chemical reaction between the eraser and pencil marks.
Answer: c) Due to the friction between the
eraser and the paper.
Why does a thermometer measure body
temperature?
Due to the
reflection of body heat by the thermometer.
Due to the
absorption of body heat by the thermometer.
Due to the
conduction of body heat through the thermometer.
Due to the
expansion of the liquid in the thermometer with temperature changes.
Answer: d) Due to the expansion of the
liquid in the thermometer with temperature changes.
Why does a camera flash produce a bright
light?
Due to the
reflection of light by the camera flash.
Due to the
absorption of light by the camera flash.
Due to the
emission of light by the camera flash.
Due to the
refraction of light by the camera flash.
Answer: c) Due to the emission of light by
the camera flash.
Why does a magnet attract certain
materials?
Due to the
absorption of magnetic field lines by the material.
Due to the
reflection of magnetic field lines by the material.
Due to the
conduction of magnetic field lines through the material.
Due to the
magnetic properties of the material aligning with the magnet's field.
Answer: d) Due to the magnetic properties
of the material aligning with the magnet's field.
Why does a plant bend towards the light
source?
Due to the absorption
of light by the plant.
Due to the
reflection of light by the plant.
Due to the
refraction of light by the plant.
Due to the
process of phototropism in the plant.
Answer: d) Due to the process of
phototropism in the plant.
Why does a metal spoon feel hot when left
in the sun?
Due to the
absorption of sunlight by the spoon.
Due to the
reflection of sunlight by the spoon.
Due to the
conduction of heat from the sun to the spoon.
Due to the
evaporation of moisture from the spoon.
Answer: c) Due to the conduction of heat
from the sun to the spoon.
Why does a clock lose time over a long
period?
Due to the
expansion of the clock's components.
Due to the
decrease in the clock's power supply.
Due to the
increase in friction within the clock.
Due to the
decrease in the clock's accuracy over time.
Answer: d) Due to the decrease in the
clock's accuracy over time.
Why does a pencil mark appear darker when
pressed harder on paper?
Due to the
reflection of light by the pencil mark.
Due to the
absorption of light by the pencil mark.
Due to the
scattering of light by the pencil mark.
Due to the
refraction of light by the pencil mark.
Answer: b) Due to the absorption of light
by the pencil mark.
Why does an ice cube melt when placed in a
glass of water?
Due to the absorption
of heat from the water.
Due to the
reflection of heat by the ice cube.
Due to the
conduction of heat through the ice cube.
Due to the
emission of heat by the ice cube.
Answer: a) Due to the absorption of heat
from the water.
Why does a balloon deflate over time?
Due to the
absorption of air by the balloon.
Due to the
reflection of air by the balloon.
Due to the
conduction of air through the balloon.
Due to the
escape of air through small pores in the balloon material.
Answer: d) Due to the escape of air through
small pores in the balloon material.
Why does a refrigerator keep food cold?
Due to the
reflection of cold by the refrigerator.
Due to the
absorption of cold by the refrigerator.
Due to the
conduction of cold through the refrigerator.
Due to the
removal of heat from the food by the refrigerator's cooling system.
Answer: d) Due to the removal of heat from
the food by the refrigerator's cooling system.
Why does a metal spoon feel colder than a
wooden spoon in the freezer?
Metals have a
higher specific heat capacity than wood.
Metals conduct
heat better than wood.
Metals have a
lower freezing point than wood.
Metals have a
higher thermal expansion coefficient than wood.
Answer: b) Metals conduct heat better than
wood.
Why does a person's hair stand up when
rubbed with a balloon?
Due to the
reflection of charges by the hair.
Due to the
absorption of charges by the hair.
Due to the
conduction of charges through the hair.
Due to the
transfer of charges from the balloon to the hair.
Answer: d) Due to the transfer of charges
from the balloon to the hair.
Why does a stone sink in water while a ship
floats?
Because the
stone is denser than water.
Because the
stone is less dense than water.
Because the
ship is denser than water.
Because the
ship is less dense than water.
Answer: b) Because the stone is denser than
water.
Why does a light bulb produce light?
Due to the
reflection of light within the bulb.
Due to the
absorption of light by the bulb.
Due to the
emission of light by the bulb's filament.
Due to the
refraction of light by the bulb's glass casing.
Answer: c) Due to the emission of light by
the bulb's filament.
Why does a mosquito bite cause itchiness?
Due to the
absorption of blood by the mosquito.
Due to the
reflection of itchiness by the skin.
Due to the
injection of an irritating substance by the mosquito.
Due to the
conduction of itchiness through the nerves.
Answer: c) Due to the injection of an
irritating substance by the mosquito.
Why does a glass crack when hot liquid is
poured into it?
Because glass
expands more than the liquid when heated.
Because glass
contracts more than the liquid when heated.
Because glass
and the liquid have different rates of expansion when heated.
Because glass
and the liquid have different coefficients of thermal conductivity.
Answer: a) Because glass expands more than
the liquid when heated.
Why does a rainbow appear after rain?
Due to the
absorption of light by raindrops.
Due to the
reflection of light by raindrops.
Due to the
scattering of light by raindrops.
Due to the
refraction and reflection of light by raindrops.
Answer: d) Due to the refraction and
reflection of light by raindrops.
Why does a guitar string produce sound when
plucked?
Due to the
absorption of sound waves by the string.
Due to the
reflection of sound waves by the string.
Due to the
conduction of sound waves through the string.
Due to the
vibration of the string creating sound waves.
Answer: d) Due to the vibration of the
string creating sound waves.
Why does a cloud form in the sky?
Due to the
absorption of water vapor by the atmosphere.
Due to the
reflection of sunlight by water droplets in the atmosphere.
Due to the
condensation of water vapor in the atmosphere.
Due to the
evaporation of water from the Earth's surface.
Answer: c) Due to the condensation of water
vapor in the atmosphere.
Why does a glass of cold water sweat?
Due to the
absorption of moisture from the air by the glass.
Due to the
reflection of heat by the glass.
Due to the
conduction of heat through the glass.
Due to the condensation
of water vapor on the cold glass.
Answer: d) Due to the condensation of water
vapor on the cold glass.
Why does a car's engine overheat?
Due to the
absorption of heat from the environment.
Due to the
reflection of heat by the engine.
Due to the
conduction of heat through the engine.
Due to the
inability to dissipate excess heat from the engine.
Answer: d) Due to the inability to
dissipate excess heat from the engine.
Why does a soap bubble burst when touched?
Due to the
absorption of air by the bubble.
Due to the
reflection of light by the bubble.
Due to the
conduction of heat through the bubble.
Due to the
rupture of the bubble's thin film.
Answer: d) Due to the rupture of the
bubble's thin film.
Why does a fridge feel cold inside?
Due to the
absorption of cold air by the fridge.
Due to the
reflection of cold by the fridge.
Due to the
conduction of cold through the fridge.
Due to the
removal of heat from the inside of the fridge.
Answer: d) Due to the removal of heat from
the inside of the fridge.
Why does an egg float in saltwater but sink
in freshwater?
Because
saltwater is denser than freshwater.
Because
freshwater is denser than saltwater.
Because
saltwater has a higher boiling point than freshwater.
Because
saltwater has a higher freezing point than freshwater.
Answer: a) Because saltwater is denser than
freshwater.
Why does a rubber band stretch when pulled?
Due to the
absorption of tension by the rubber band.
Due to the
reflection of tension by the rubber band.
Due to the
conduction of tension through the rubber band.
Due to the
elasticity of the rubber band.
Answer: d) Due to the elasticity of the
rubber band.
Why does a matchstick light up when struck
against a rough surface?
Due to the
absorption of heat by the matchstick.
Due to the
reflection of light by the matchstick.
Due to the
conduction of heat through the matchstick.
Due to the
chemical reaction between the matchstick and the rough surface.
Answer: d) Due to the chemical reaction
between the matchstick and the rough surface.
Why does a compass point towards the North?
Due to the
absorption of Earth's magnetic field by the compass.
Due to the
reflection of Earth's magnetic field by the compass.
Due to the
conduction of Earth's magnetic field through the compass.
Due to the magnetic
properties of the compass aligning with Earth's magnetic field.
Answer: d) Due to the magnetic properties
of the compass aligning with Earth's magnetic field.
Why does a bubble rise to the surface in a
glass of soda?
Due to the
absorption of carbon dioxide by the bubble.
Due to the
reflection of light by the bubble.
Due to the
conduction of heat through the bubble.
Due to the
buoyancy of the bubble in the denser soda.
Answer: d) Due to the buoyancy of the
bubble in the denser soda.
Why does a metal spoon feel hotter than a
wooden spoon when left in hot soup?
Metals have a
higher specific heat capacity than wood.
Metals conduct
heat better than wood.
Metals have a
lower boiling point than wood.
Metals have a
higher thermal expansion coefficient than wood.
Answer: b) Metals conduct heat better than
wood.
Why does a rainbow have different colors?
Due to the
absorption of light by raindrops.
Due to the
reflection of light by raindrops.
Due to the
scattering of light by raindrops.
Due to the
refraction and dispersion of light by raindrops.
Answer: d) Due to the refraction and
dispersion of light by raindrops.
Why does a dog pant on a hot day?
Due to the
absorption of heat by the dog.
Due to the
reflection of heat by the dog.
Due to the
conduction of heat through the dog.
Due to the
evaporation of moisture from the dog's tongue.
Answer: d) Due to the evaporation of
moisture from the dog's tongue.
Why does a volcano erupt?
Due to the
absorption of magma by the volcano.
Due to the
reflection of heat by the volcano.
Due to the
conduction of heat through the volcano.
Due to the
release of built-up pressure and magma from the Earth's crust.
Answer: d) Due to the release of built-up
pressure and magma from the Earth's crust.
Why does a camera lens focus light to form
an image?
Due to the
absorption of light by the lens.
Due to the
reflection of light by the lens.
Due to the
conduction of light through the lens.
Due to the
refraction of light by the lens.
Answer: d) Due to the refraction of light
by the lens.
Why does a fire need oxygen to burn?
Due to the
absorption of oxygen by the fire.
Due to the
reflection of oxygen by the fire.
Due to the
conduction of oxygen through the fire.
Due to the
chemical reaction between oxygen and the fuel in the fire.
Answer: d) Due to the chemical reaction
between oxygen and the fuel in the fire.
Why does a car's tire grip the road?
Due to the
absorption of road friction by the tire.
Due to the
reflection of road friction by the tire.
Due to the
conduction of road friction through the tire.
Due to the
interaction between the tire's tread and the road surface.
Answer: d) Due to the interaction between
the tire's tread and the road surface.
Why does a helium balloon rise in the air?
Due to the
absorption of helium by the balloon.
Due to the
reflection of helium by the balloon.
Due to the
conduction of helium through the balloon.
Due to the
buoyancy of the lighter-than-air helium gas.
Answer: d) Due to the buoyancy of the
lighter-than-air helium gas.
Why does an apple turn brown when cut and
exposed to air?
Due to the
absorption of oxygen by the apple.
Due to the
reflection of light by the apple.
Due to the
conduction of oxygen through the apple.
Due to a
chemical reaction between enzymes in the apple and oxygen in the air.
Answer: d) Due to a chemical reaction
between enzymes in the apple and oxygen in the air.
Why does a thermometer measure temperature?
Due to the
absorption of temperature by the thermometer.
Due to the
reflection of temperature by the thermometer.
Due to the
conduction of temperature through the thermometer.
Due to the
expansion or contraction of a liquid or solid in the thermometer with
temperature changes.
Answer: d) Due to the expansion or
contraction of a liquid or solid in the thermometer with temperature changes.
Why does a bat use echolocation?
Due to the
absorption of sound by the bat.
Due to the
reflection of sound by the bat.
Due to the
conduction of sound through the bat.
Due to the
emission and reception of sound waves to navigate and locate objects.
Answer: d) Due to the emission and
reception of sound waves to navigate and locate objects.
Why does a compass needle align with
Earth's magnetic field?
Due to the
absorption of Earth's magnetic field by the needle.
Due to the
reflection of Earth's magnetic field by the needle.
Due to the
conduction of Earth's magnetic field through the needle.
Due to the
magnetic properties of the needle aligning with Earth's magnetic field.
Answer: d) Due to the magnetic properties
of the needle aligning with Earth's magnetic field.
Why does a seedling grow towards the light?
Due to the
absorption of light by the seedling.
Due to the
reflection of light by the seedling.
Due to the
conduction of light through the seedling.
Due to the
process of phototropism, in which the seedling bends toward the light source.
Answer: d) Due to the process of
phototropism, in which the seedling bends toward the light source.
Why does a metal spoon heat up when placed
in hot soup?
Due to the
absorption of heat from the soup.
Due to the
reflection of heat by the spoon.
Due to the
conduction of heat through the spoon.
Due to the
emission of heat by the spoon.
Answer: c) Due to the conduction of heat
through the spoon.
Why does a metal coin feel colder than a
paper bill on a winter day?
Metals have a
higher specific heat capacity than paper.
Metals conduct
heat better than paper.
Metals have a
lower freezing point than paper.
Metals have a
higher thermal expansion coefficient than paper.
Answer: b) Metals conduct heat better than
paper.
Why does a sponge absorb water?
Due to the
absorption of moisture by the sponge.
Due to the
reflection of water by the sponge.
Due to the
conduction of water through the sponge.
Due to the
capillary action and porous structure of the sponge.
Answer: d) Due to the capillary action and
porous structure of the sponge.
Why does an airplane stay in the air?
Due to the
absorption of air by the airplane.
Due to the
reflection of air by the airplane.
Due to the
conduction of air through the airplane.
Due to the
combination of lift generated by the wings and the forward motion of the
airplane.
Answer: d) Due to the combination of lift
generated by the wings and the forward motion of the airplane.
Why does a flower bloom in the spring?
Due to the
absorption of sunlight by the flower.
Due to the
reflection of light by the flower.
Due to the
conduction of heat through the flower.
Due to the
response of the flower to seasonal changes in temperature and daylight.
Answer: d) Due to the response of the
flower to seasonal changes in temperature and daylight.
Why does a pencil appear bent when
partially submerged in a glass of water?
Due to the
absorption of light by the water.
Due to the
reflection of light by the pencil.
Due to the
refraction of light at the interface between the air and water.
Due to the
diffraction of light passing through the water.
Answer: c) Due to the refraction of light
at the interface between the air and water.
Why does a metal spoon feel hotter than a
plastic spoon when placed in hot liquid?
Metals have a
higher specific heat capacity than plastic.
Metals conduct
heat better than plastic.
Metals have a
lower boiling point than plastic.
Metals have a
higher thermal expansion coefficient than plastic.
Answer: b) Metals conduct heat better than
plastic.
Why does a person feel dizzy after spinning
around rapidly?
Due to the
absorption of dizziness by the person.
Due to the
reflection of dizziness by the person.
Due to the
conduction of dizziness through the person.
Due to the
disturbance of the fluid in the inner ear, which affects the person's sense of
balance.
Answer: d) Due to the disturbance of the
fluid in the inner ear, which affects the person's sense of balance.
Why does a cloud of smoke rise into the
air?
Due to the
absorption of smoke by the air.
Due to the
reflection of smoke by the air.
Due to the
conduction of smoke through the air.
Due to the
buoyancy of the warm smoke in the cooler surrounding air.
Answer: d) Due to the buoyancy of the warm
smoke in the cooler surrounding air.
Why does a metal spoon feel colder than a
ceramic plate in the freezer?
Metals have a
higher specific heat capacity than ceramic.
Metals conduct
heat better than ceramic.
Metals have a
lower freezing point than ceramic.
Metals have a
higher thermal expansion coefficient than ceramic.
Answer: b) Metals conduct heat better than
ceramic.
Why does a balloon stick to a wall after
rubbing it against your hair?
Due to the
absorption of static electricity by the balloon.
Due to the
reflection of static electricity by the balloon.
Due to the
conduction of static electricity through the balloon.
Due to the
attraction between the charged balloon and the charged wall.
Answer: d) Due to the attraction between
the charged balloon and the charged wall.
Why does an ice cube float in a glass of
water?
Because ice is
less dense than water.
Because ice is
more dense than water.
Because ice has
a higher boiling point than water.
Because ice has
a lower freezing point than water.
Answer: a) Because ice is less dense than
water.
Why does a glass crack when hot water is
poured into it?
Due to the
absorption of heat by the glass.
Due to the
reflection of heat by the glass.
Due to the
conduction of heat through the glass.
Due to thermal
stress caused by the rapid temperature change.
Answer: d) Due to thermal stress caused by
the rapid temperature change.
Why does a microwave oven heat food faster
than a conventional oven?
Due to the
absorption of microwaves by the food.
Due to the
reflection of microwaves by the food.
Due to the
conduction of microwaves through the food.
Due to the
specific design and operation of the microwave oven that targets water
molecules in the food.
Answer: d) Due to the specific design and
operation of the microwave oven that targets water molecules in the food.
Why does a bicycle stay upright while
moving?
Due to the
absorption of balance by the bicycle.
Due to the
reflection of balance by the bicycle.
Due to the
conduction of balance through the bicycle.
Due to the
combined effects of forward motion, gravity, and the design of the bicycle.
Answer: d) Due to the combined effects of
forward motion, gravity, and the design of the bicycle.
Why does a metal spoon feel colder than a
wooden spoon when left in cold ice cream?
Metals have a
higher specific heat capacity than wood.
Metals conduct
heat better than wood.
Metals have a
lower freezing point than wood.
Metals have a
higher thermal expansion coefficient than wood.
Answer: b) Metals conduct heat better than
wood.
Why does a solar panel generate electricity
from sunlight?
Due to the
absorption of light by the solar panel.
Due to the
reflection of light by the solar panel.
Due to the
conduction of light through the solar panel.
Due to the
conversion of light energy into electrical energy by the photovoltaic cells in
the solar panel.
Answer: d) Due to the conversion of light
energy into electrical energy by the photovoltaic cells in the solar panel.
Why does a metal spoon feel hotter than a
plastic spoon when placed in hot water?
Metals have a
higher specific heat capacity than plastic.
Metals conduct
heat better than plastic.
Metals have a
lower boiling point than plastic.
Metals have a
higher thermal expansion coefficient than plastic.
Answer: b) Metals conduct heat better than
plastic.
Why does a car's radiator cool down the
engine?
Due to the
absorption of heat by the radiator.
Due to the
reflection of heat by the radiator.
Due to the
conduction of heat through the radiator.
Due to the
transfer of heat from the engine to the surrounding air through the radiator.
Answer: d) Due to the transfer of heat from
the engine to the surrounding air through the radiator.
Why does a soap bubble pop when touched?
Due to the
absorption of air by the soap bubble.
Due to the
reflection of light by the soap bubble.
Due to the
conduction of soap solution through the bubble.
Due to the
surface tension of the soap bubble being disrupted by the contact.
Answer: d) Due to the surface tension of
the soap bubble being disrupted by the contact.
Why does a flashlight produce light?
Due to the absorption
of light by the flashlight.
Due to the
reflection of light by the flashlight.
Due to the
conduction of light through the flashlight.
Due to the
conversion of electrical energy into light energy by the bulb or LED in the
flashlight.
Answer: d) Due to the conversion of
electrical energy into light energy by the bulb or LED in the flashlight.
Why does a clock pendulum swing back and
forth?
Due to the
absorption of time by the clock.
Due to the
reflection of time by the clock.
Due to the
conduction of time through the clock.
Due to the
force of gravity and the potential energy stored in the elevated position of
the pendulum.
Answer: d) Due to the force of gravity and
the potential energy stored in the elevated position of the pendulum.
Why does a lemon taste sour?
Due to the
absorption of sourness by the lemon.
Due to the
reflection of sourness by the lemon.
Due to the
conduction of sourness through the lemon.
Due to the
presence of citric acid in the lemon, which stimulates sour taste receptors.
Answer: d) Due to the presence of citric
acid in the lemon, which stimulates sour taste receptors.
Why does a helium-filled balloon rise in
the air?
Due to the
absorption of helium by the balloon.
Due to the
reflection of helium by the balloon.
Due to the
conduction of helium through the balloon.
Due to the
buoyancy of the lighter-than-air helium gas compared to the surrounding air.
Answer: d) Due to the buoyancy of the
lighter-than-air helium gas compared to the surrounding air.
Why does a coffee cup feel warm to the
touch when filled with hot coffee?
Due to the
absorption of heat by the coffee cup.
Due to the
reflection of heat by the coffee cup.
Due to the
conduction of heat through the coffee cup.
Due to the
transfer of heat from the hot coffee to the coffee cup and then to your hand.
Answer: d) Due to the transfer of heat from
the hot coffee to the coffee cup and then to your hand.
Why does a raincoat keep you dry in the
rain?
Due to the
absorption of rainwater by the raincoat.
Due to the
reflection of rainwater by the raincoat.
Due to the
conduction of rainwater through the raincoat.
Due to the
water-resistant or waterproof properties of the raincoat material.
Answer: d) Due to the water-resistant or
waterproof properties of the raincoat material.
Why does a metal spoon feel colder than a
plastic spoon when left in a refrigerator?
Metals have a
higher specific heat capacity than plastic.
Metals conduct
heat better than plastic.
Metals have a
lower freezing point than plastic.
Metals have a
higher thermal expansion coefficient than plastic.
Answer: b) Metals conduct heat better than
plastic.
Why does a rainbow form after rain?
Due to the
absorption of light by the raindrops.
Due to the
reflection of light by the raindrops.
Due to the
conduction of light through the raindrops.
Due to the
refraction, reflection, and dispersion of sunlight by the raindrops.
Answer: d) Due to the refraction,
reflection, and dispersion of sunlight by the raindrops.
Why does a battery-powered flashlight
become dim when the batteries are almost depleted?
Due to the
absorption of light by the flashlight.
Due to the
reflection of light by the flashlight.
Due to the
conduction of light through the flashlight.
Due to the
decrease in electrical energy available to power the light bulb or LED.
Answer: d) Due to the decrease in
electrical energy available to power the light bulb or LED.
Why does a mirror reflect light?
Due to the
absorption of light by the mirror.
Due to the
transmission of light through the mirror.
Due to the
conduction of light through the mirror.
Due to the
reflection of light by the smooth, polished surface of the mirror.
Answer: d) Due to the reflection of light
by the smooth, polished surface of the mirror.
Why does a sponge expand when soaked in
water?
Due to the absorption
of water by the sponge.
Due to the
reflection of water by the sponge.
Due to the
conduction of water through the sponge.
Due to the
expansion of the sponge's porous structure as it absorbs water.
Answer: d) Due to the expansion of the
sponge's porous structure as it absorbs water.
Why does a fire need oxygen to burn?
Due to the
absorption of oxygen by the fire.
Due to the
reflection of oxygen by the fire.
Due to the
conduction of oxygen through the fire.
Due to the
chemical reaction between the fuel and oxygen, which releases heat and light.
Answer: d) Due to the chemical reaction
between the fuel and oxygen, which releases heat and light.
Why does a metal spoon feel hot when left
in a cup of hot tea?
Due to the
absorption of heat by the spoon.
Due to the
reflection of heat by the spoon.
Due to the
conduction of heat through the spoon.
Due to the
transfer of heat from the hot tea to the spoon.
Answer: d) Due to the transfer of heat from
the hot tea to the spoon.
Why does a compass needle point north?
Due to the
absorption of Earth's magnetic field by the needle.
Due to the
reflection of Earth's magnetic field by the needle.
Due to the
conduction of Earth's magnetic field through the needle.
Due to the
alignment of the needle with Earth's magnetic field.
Answer: d) Due to the alignment of the
needle with Earth's magnetic field.
Why does a helium balloon deflate over
time?
Due to the
absorption of helium by the balloon.
Due to the
reflection of helium by the balloon.
Due to the
conduction of helium through the balloon.
Due to the
gradual diffusion of helium molecules through the balloon material.
Answer: d) Due to the gradual diffusion of
helium molecules through the balloon material.
Why does a bread dough rise when left to
rest?
Due to the
absorption of air by the dough.
Due to the
reflection of air by the dough.
Due to the
conduction of air through the dough.
Due to the
action of yeast fermenting sugars and releasing carbon dioxide gas.
Answer: d) Due to the action of yeast
fermenting sugars and releasing carbon dioxide gas.
Why does a metal spoon feel colder than a
ceramic spoon when both are at room temperature?
Metals have a
higher specific heat capacity than ceramics.
Metals conduct
heat better than ceramics.
Metals have a
lower freezing point than ceramics.
Metals have a
higher thermal expansion coefficient than ceramics.
Answer: b) Metals conduct heat better than
ceramics.
Why does a camera produce an image when a
photograph is taken?
Due to the
absorption of light by the camera.
Due to the reflection
of light by the camera.
Due to the
conduction of light through the camera.
Due to the
focusing of light onto a photosensitive surface, such as film or an image
sensor.
Answer: d) Due to the focusing of light
onto a photosensitive surface, such as film or an image sensor.
Why does a washing machine agitate the
clothes during a wash cycle?
Due to the
absorption of dirt by the clothes.
Due to the
reflection of dirt by the clothes.
Due to the
conduction of dirt through the clothes.
Due to the
back-and-forth motion of the agitator, which helps dislodge dirt from the
clothes.
Answer: d) Due to the back-and-forth motion
of the agitator, which helps dislodge dirt from the clothes.
Why does a metal spoon feel hotter than a
wooden spoon when left in a hot pot of soup?
Metals have a
higher specific heat capacity than wood.
Metals conduct
heat better than wood.
Metals have a
lower boiling point than wood.
Metals have a
higher thermal expansion coefficient than wood.
Answer: b) Metals conduct heat better than
wood.
Why does a kite fly in the sky?
Due to the
absorption of wind by the kite.
Due to the
reflection of wind by the kite.
Due to the
conduction of wind through the kite.
Due to the lift
generated by the airflow over the kite's shape.
Answer: d) Due to the lift generated by the
airflow over the kite's shape.
Why does a glass crack when hot liquid is
poured into it?
Due to the
absorption of heat by the glass.
Due to the
reflection of heat by the glass.
Due to the
conduction of heat through the glass.
Due to thermal
stress caused by the rapid temperature change.
Answer: d) Due to thermal stress caused by
the rapid temperature change.
Why does a car's windshield fog up on a
rainy day?
Due to the
absorption of rainwater by the windshield.
Due to the
reflection of rainwater by the windshield.
Due to the
conduction of rainwater through the windshield.
Due to
condensation of water vapor from the air onto the cold windshield.
Answer: d) Due to condensation of water
vapor from the air onto the cold windshield.
Why does a pencil appear bent when
partially immersed in water?
Due to the
absorption of light by the pencil.
Due to the
reflection of light by the pencil.
Due to the
conduction of light through the pencil.
Due to the
refraction of light at the water-air interface, making the pencil appear bent.
Answer: d) Due to the refraction of light
at the water-air interface, making the pencil appear bent.
Why does a metal spoon heat up when placed
in a cup of hot coffee?
Due to the
absorption of heat by the spoon.
Due to the
reflection of heat by the spoon.
Due to the
conduction of heat through the spoon.
Due to the
transfer of heat from the hot coffee to the spoon.
Answer: c) Due to the conduction of heat
through the spoon.
Why does a soda can feel cold to the touch
when taken out of a refrigerator?
Due to the
absorption of cold by the soda can.
Due to the
reflection of cold by the soda can.
Due to the
conduction of cold through the soda can.
Due to heat
transfer from your hand to the colder soda can.
Answer: d) Due to heat transfer from your
hand to the colder soda can.
Why does an ice cube float in a glass of
water?
Due to the
absorption of water by the ice cube.
Due to the
reflection of water by the ice cube.
Due to the
conduction of water through the ice cube.
Due to the
lower density of ice compared to liquid water.
Answer: d) Due to the lower density of ice
compared to liquid water.
Why does a thunderstorm occur?
Due to the
absorption of lightning by the clouds.
Due to the
reflection of lightning by the clouds.
Due to the
conduction of lightning through the clouds.
Due to the
buildup of static electricity and the discharge of lightning in the atmosphere.
Answer: d) Due to the buildup of static
electricity and the discharge of lightning in the atmosphere.
Why does a metal spoon feel colder than a
wooden spoon at room temperature?
Metals have a
higher specific heat capacity than wood.
Metals conduct
heat better than wood.
Metals have a
lower freezing point than wood.
Metals have a
higher thermal expansion coefficient than wood.
Answer: b) Metals conduct heat better than
wood.
Why does a soap bubble burst after some
time?
Due to the
absorption of air by the soap bubble.
Due to the
reflection of light by the soap bubble.
Due to the
conduction of soap solution through the bubble.
Due to the
thinning of the soap film and the increasing surface tension, causing it to
rupture.
Answer: d) Due to the thinning of the soap
film and the increasing surface tension, causing it to rupture.
Why does a metal spoon feel warmer than a
plastic spoon when left in a cup of hot water?
Metals have a
higher specific heat capacity than plastic.
Metals conduct
heat better than plastic.
Metals have a
lower freezing point than plastic.
Metals have a
higher thermal expansion coefficient than plastic.
Answer: b) Metals conduct heat better than
plastic.
Why does a plant wilt when not watered for
a long time?
Due to the
absorption of water by the plant.
Due to the
reflection of water by the plant.
Due to the
conduction of water through the plant.
Due to the loss
of water through transpiration, leading to a loss of turgidity in plant cells.
Answer: d) Due to the loss of water through
transpiration, leading to a loss of turgidity in plant cells.
Why does a metal object feel cooler than a
wooden object at the same temperature?
Metals have a
higher specific heat capacity than wood.
Metals conduct
heat better than wood.
Metals have a
lower boiling point than wood.
Metals have a
higher thermal expansion coefficient than wood.
Answer: b) Metals conduct heat better than
wood.
Why does a refrigerator feel cold inside?
Due to the
absorption of cold by the refrigerator.
Due to the
reflection of cold by the refrigerator.
Due to the
conduction of cold through the refrigerator.
Due to the
removal of heat from the interior by the refrigeration system, lowering the
temperature.
Answer: d) Due to the removal of heat from
the interior by the refrigeration system, lowering the temperature.
Why does a pencil eraser rub off pencil
marks on paper?
Due to the
absorption of graphite by the eraser.
Due to the
reflection of graphite by the eraser.
Due to the
conduction of graphite through the eraser.
Due to the
frictional force exerted by the eraser particles on the graphite, causing it to
be lifted off the paper.
Answer: d) Due to the frictional force
exerted by the eraser particles on the graphite, causing it to be lifted off
the paper.
Why does a glass of water left uncovered
overnight taste different the next morning?
Due to the
absorption of air by the water.
Due to the reflection
of air by the water.
Due to the
conduction of air through the water.
Due to the
dissolution of atmospheric gases, such as carbon dioxide, in the water,
altering its taste.
Answer: d) Due to the dissolution of
atmospheric gases, such as carbon dioxide, in the water, altering its taste.
Why does a balloon stick to a wall after
rubbing it against your hair?
Due to the
absorption of air by the balloon.
Due to the
reflection of air by the balloon.
Due to the
conduction of air through the balloon.
Due to the
build-up of static electricity on the balloon's surface, creating an attractive
force between the balloon and the charged wall.
Answer: d) Due to the build-up of static
electricity on the balloon's surface, creating an attractive force between the
balloon and the charged wall.
Why does a metal coin feel colder than a
paper bill when both are at room temperature?
Metals have a
higher specific heat capacity than paper.
Metals conduct
heat better than paper.
Metals have a
lower freezing point than paper.
Metals have a
higher thermal expansion coefficient than paper.
Answer: b) Metals conduct heat better than
paper.
Why does a car's engine produce smoke when
it is overheating?
Due to the
absorption of smoke by the engine.
Due to the
reflection of smoke by the engine.
Due to the
conduction of smoke through the engine.
Due to the
burning of oil or coolant in the engine, resulting in smoke emission.
Answer: d) Due to the burning of oil or
coolant in the engine, resulting in smoke emission.
Why does a magnet attract certain metals?
Due to the
absorption of magnetism by the metals.
Due to the
reflection of magnetism by the metals.
Due to the
conduction of magnetism through the metals.
Due to the
presence of magnetic fields generated by the magnet, which induce magnetic
properties in the metals, causing attraction.
Answer: d) Due to the presence of magnetic
fields generated by the magnet, which induce magnetic properties in the metals,
causing attraction.
Why does a microwave oven heat food
quickly?
Due to the
absorption of heat by the oven.
Due to the
reflection of heat by the oven.
Due to the
conduction of heat through the oven.
Due to the
generation of microwaves that interact with water molecules in the food,
causing them to vibrate and generate heat.
Answer: d) Due to the generation of
microwaves that interact with water molecules in the food, causing them to
vibrate and generate heat.
Why does a compass needle point north?
Due to the
absorption of magnetism by the needle.
Due to the
reflection of magnetism by the needle.
Due to the
conduction of magnetism through the needle.
Due to the
alignment of the needle with Earth's magnetic field, where the north pole of
the needle is attracted to the magnetic south pole of the Earth's north pole.
Answer: d) Due to the alignment of the
needle with Earth's magnetic field, where the north pole of the needle is
attracted to the magnetic south pole of the Earth's north pole.
Why does a rainbow appear in the sky after
rain?
Due to the
absorption of light by raindrops.
Due to the
reflection of light by raindrops.
Due to the
conduction of light through raindrops.
Due to the
refraction and dispersion of sunlight by raindrops, creating a spectrum of
colors.
Answer: d) Due to the refraction and
dispersion of sunlight by raindrops, creating a spectrum of colors.
Why does an iron nail rust when exposed to
moisture?
Due to the
absorption of rust by the nail.
Due to the
reflection of rust by the nail.
Due to the
conduction of rust through the nail.
Due to the
reaction of iron with oxygen in the presence of moisture, forming iron oxide
(rust).
Answer: d) Due to the reaction of iron with
oxygen in the presence of moisture, forming iron oxide (rust).
Why does a fire need oxygen to burn?
Due to the
absorption of oxygen by the fire.
Due to the
reflection of oxygen by the fire.
Due to the
conduction of oxygen through the fire.
Due to the
chemical reaction of oxygen with the fuel in the fire, releasing heat and light
energy.
Answer: d) Due to the chemical reaction of
oxygen with the fuel in the fire, releasing heat and light energy.
Why does a bicycle stay upright while
moving?
Due to the
absorption of balance by the bicycle.
Due to the
reflection of balance by the bicycle.
Due to the
conduction of balance through the bicycle.
Due to the combination
of various factors, including the gyroscopic effect, the caster effect, and
rider input, which help maintain stability and balance.
Answer: d) Due to the combination of
various factors, including the gyroscopic effect, the caster effect, and rider
input, which help maintain stability and balance.
Why does a camera use a lens to focus an
image?
Due to the
absorption of light by the lens.
Due to the
reflection of light by the lens.
Due to the
conduction of light through the lens.
Due to the
refraction of light by the lens, which bends the light rays and focuses them
onto the camera's image sensor.
Answer: d) Due to the refraction of light
by the lens, which bends the light rays and focuses them onto the camera's
image sensor.
Why does a car's tires grip the road?
Due to the
absorption of grip by the tires.
Due to the
reflection of grip by the tires.
Due to the
conduction of grip through the tires.
Due to the
interaction between the tire's tread and the road surface, creating friction
that provides traction and grip.
Answer: d) Due to the interaction between
the tire's tread and the road surface, creating friction that provides traction
and grip.
Why does a paperclip sink in water while a
ship floats?
Due to the
absorption of water by the paperclip.
Due to the
reflection of water by the paperclip.
Due to the
conduction of water through the paperclip.
Due to the
difference in density between the paperclip and the ship, where the ship has a
shape that allows it to displace more water, providing buoyancy and floating.
Answer: d) Due to the difference in density
between the paperclip and the ship, where the ship has a shape that allows it
to displace more water, providing buoyancy and floating.
Why does a light bulb produce light when
connected to a power source?
Due to the
absorption of light by the bulb.
Due to the
reflection of light by the bulb.
Due to the
conduction of light through the bulb.
Due to the
electrical current passing through the filament of the bulb, causing it to heat
up and emit light due to incandescence or through other processes such as
fluorescence or LED emission.
Answer: d) Due to the electrical current
passing through the filament of the bulb, causing it to heat up and emit light
due to incandescence or through other processes such as fluorescence or LED
emission.
Why does a needle float on the surface of
water when placed gently?
Due to the
absorption of water by the needle.
Due to the
reflection of water by the needle.
Due to the
conduction of water through the needle.
Due to surface
tension, where the cohesive forces between water molecules create an upward
force that allows the needle to float on the surface.
Answer: d) Due to surface tension, where
the cohesive forces between water molecules create an upward force that allows
the needle to float on the surface.
Why does a glass crack when hot liquid is
poured into it?
Due to the
absorption of heat by the glass.
Due to the
reflection of heat by the glass.
Due to the
conduction of heat through the glass.
Due to thermal
expansion, where the sudden temperature change causes uneven expansion of the
glass, leading to stress and ultimately cracking.
Answer: d) Due to thermal expansion, where
the sudden temperature change causes uneven expansion of the glass, leading to
stress and ultimately cracking.
Why does a musical instrument produce
sound?
Due to the
absorption of sound by the instrument.
Due to the
reflection of sound by the instrument.
Due to the
conduction of sound through the instrument.
Due to
vibrations produced by the instrument, which create sound waves in the
surrounding air.
Answer: d) Due to vibrations produced by
the instrument, which create sound waves in the surrounding air.
Why does a washing machine spin the clothes
during the wash cycle?
Due to the
absorption of spinning by the machine.
Due to the
reflection of spinning by the machine.
Due to the
conduction of spinning through the machine.
Due to the
rotation of the drum inside the washing machine, which agitates and moves the
clothes, helping to clean them more effectively.
Answer: d) Due to the rotation of the drum
inside the washing machine, which agitates and moves the clothes, helping to
clean them more effectively.
Why does a leaf appear green to our eyes?
Due to the
absorption of green by the leaf.
Due to the
reflection of green by the leaf.
Due to the
conduction of green through the leaf.
Due to the
presence of chlorophyll pigments in the leaf that absorb most of the light
spectrum, except for green wavelengths, which are reflected and detected by our
eyes.
Answer: d) Due to the presence of
chlorophyll pigments in the leaf that absorb most of the light spectrum, except
for green wavelengths, which are reflected and detected by our eyes.
Why does a fridge keep food cold?
Due to the
absorption of cold by the fridge.
Due to the
reflection of cold by the fridge.
Due to the
conduction of cold through the fridge.
Due to the refrigeration process, where a
refrigerant absorbs heat from the food and releases it outside the fridge,
keeping the interior cold.
Answer: d) Due to the refrigeration
process, where a refrigerant absorbs heat from the food and releases it outside
the fridge, keeping the interior cold.
Why does a kettle whistle when the water
boils?
Due to the
absorption of sound by the kettle.
Due to the reflection
of sound by the kettle.
Due to the
conduction of sound through the kettle.
Due to the
steam generated from boiling water, escaping through a small opening in the
kettle's spout, causing vibrations and producing a whistling sound.
Answer: d) Due to the steam generated from
boiling water, escaping through a small opening in the kettle's spout, causing
vibrations and producing a whistling sound.
Why does a camera use a flash in low-light
conditions?
Due to the
absorption of light by the flash.
Due to the
reflection of light by the flash.
Due to the
conduction of light through the flash.
Due to the need
for additional light to properly expose the photograph in low-light
environments, where the flash emits a burst of intense light to illuminate the
subject.
Answer: d) Due to the need for additional
light to properly expose the photograph in low-light environments, where the
flash emits a burst of intense light to illuminate the subject.
Why does a soap bubble pop?
Due to the
absorption of bubble by the soap.
Due to the
reflection of bubble by the soap.
Due to the
conduction of bubble through the soap.
Due to the
thinning of the soap film, where water molecules evaporate from the surface,
causing the bubble to shrink and eventually burst.
Answer: d) Due to the thinning of the soap
film, where water molecules evaporate from the surface, causing the bubble to
shrink and eventually burst.
Why does a car's windshield fog up in cold
weather?
Due to the
absorption of fog by the windshield.
Due to the
reflection of fog by the windshield.
Due to the
conduction of fog through the windshield.
Due to the
temperature difference between the inside and outside of the car, causing
moisture in the air to condense on the cold windshield, resulting in fogging.
Answer: d) Due to the temperature
difference between the inside and outside of the car, causing moisture in the
air to condense on the cold windshield, resulting in fogging.
Why does a balloon stick to a wall after
rubbing it against hair?
Due to the
absorption of stickiness by the balloon.
Due to the
reflection of stickiness by the balloon.
Due to the
conduction of stickiness through the balloon.
Due to static
electricity generated by rubbing the balloon against hair, creating an
imbalance of positive and negative charges that causes the balloon to stick to
the wall.
Answer: d) Due to static electricity
generated by rubbing the balloon against hair, creating an imbalance of
positive and negative charges that causes the balloon to stick to the wall.
Why does a metal spoon feel hotter than a
wooden spoon when both are placed in hot water?
Metals have a
higher specific heat capacity than wood.
Metals conduct
heat better than wood.
Metals reflect
heat more efficiently than wood.
Metals absorb
heat more readily than wood.
Answer: b) Metals conduct heat better than
wood.
Why does an ice cube float in a glass of
water?
Due to the
absorption of ice by the water.
Due to the
reflection of ice by the water.
Due to the
conduction of ice through the water.
Due to the
lower density of ice compared to water, causing it to float.
Answer: d) Due to the lower density of ice
compared to water, causing it to float.
Why does a plane generate lift and fly?
Due to the
absorption of lift by the plane.
Due to the
reflection of lift by the plane.
Due to the
conduction of lift through the plane.
Due to the
shape of the wings and the Bernoulli's principle, which create a pressure
difference, generating lift and allowing the plane to fly.
Answer: d) Due to the shape of the wings
and the Bernoulli's principle, which create a pressure difference, generating
lift and allowing the plane to fly.
Why does a compass needle point towards the
North?
Due to the
absorption of North by the compass needle.
Due to the
reflection of North by the compass needle.
Due to the
conduction of North through the compass needle.
Due to the
Earth's magnetic field, where the compass needle aligns itself with the
magnetic field lines and points towards the North pole.
Answer: d) Due to the Earth's magnetic
field, where the compass needle aligns itself with the magnetic field lines and
points towards the North pole.
Why does a microwave oven heat food
quickly?
Due to the
absorption of heat by the oven.
Due to the
reflection of heat by the oven.
Due to the
conduction of heat through the oven.
Due to the use
of microwaves, which are electromagnetic waves that cause water molecules in
the food to vibrate and generate heat.
Answer: d) Due to the use of microwaves,
which are electromagnetic waves that cause water molecules in the food to
vibrate and generate heat.
Why does a cork float on water while a
stone sinks?
Due to the
absorption of buoyancy by the cork.
Due to the
reflection of buoyancy by the cork.
Due to the
conduction of buoyancy through the cork.
Due to the
difference in density between the cork and the stone, where the cork has a
lower density and displaces more water, providing buoyancy and floating.
Answer: d) Due to the difference in density
between the cork and the stone, where the cork has a lower density and
displaces more water, providing buoyancy and floating.
Why does a magnifying glass make objects
appear larger?
Due to the
absorption of size by the magnifying glass.
Due to the
reflection of size by the magnifying glass.
Due to the
conduction of size through the magnifying glass.
Due to the lens of the magnifying glass
bending light rays, causing them to converge and creating a magnified image.
Why does a rainbow form after rain?
Due to the
absorption of rainbows by the atmosphere.
Due to the
reflection of rainbows by water droplets in the air.
Due to the
conduction of rainbows through the clouds.
Due to the
refraction, dispersion, and reflection of sunlight by water droplets in the
air, resulting in the formation of a spectrum of colors.
Answer: d) Due to the refraction,
dispersion, and reflection of sunlight by water droplets in the air, resulting
in the formation of a spectrum of colors.
Why does a metal spoon feel cold when left
outside on a cold day?
Due to the
absorption of cold by the spoon.
Due to the
reflection of cold by the spoon.
Due to the
conduction of cold through the spoon.
Due to metals
being good conductors of heat, the spoon quickly transfers heat away from the
hand, making it feel cold.
Answer: d) Due to metals being good
conductors of heat, the spoon quickly transfers heat away from the hand, making
it feel cold.
Why does a helium balloon rise in the air?
Due to the
absorption of rising by the balloon.
Due to the
reflection of rising by the balloon.
Due to the
conduction of rising through the balloon.
Due to the
buoyant force exerted on the balloon, as helium is lighter than air and causes
the balloon to float upwards.
Answer: d) Due to the buoyant force exerted
on the balloon, as helium is lighter than air and causes the balloon to float
upwards.
Why does a car's engine produce exhaust
fumes?
Due to the
absorption of fumes by the engine.
Due to the
reflection of fumes by the engine.
Due to the
conduction of fumes through the engine.
Due to the
combustion of fuel in the engine, which produces waste gases that are released
as exhaust fumes.
Answer: d) Due to the combustion of fuel in
the engine, which produces waste gases that are released as exhaust fumes.
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