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Worksheets8/8. Thermal Processes Quiz
Total questions: 20
Worksheet time: 2hrs 40mins
What happens when two objects at different temperatures are placed in contact for a long period?
The colder object stops transferring energy to the hotter object.
The hotter object continues transferring energy indefinitely.
Energy is transferred from the hotter to the colder object until they reach the same temperature.
No energy is transferred at all.
What happens microscopically during conduction in a non-metal?
Free electrons carry energy.
Atoms vibrate and pass on energy to neighbouring atoms.
Atoms migrate to the colder region.
Molecules emit infrared radiation.
Which statement best describes conduction in a metal rod heated at one end?
Only atoms vibrate to transfer energy.
Free electrons and vibrating atoms both transfer energy.
Only free electrons transfer energy.
Atoms move from the hot end to the cold end.
Why does a metal spoon feel cooler than a plastic spoon in an air-conditioned room?
Metal is actually colder in temperature.
Metal conducts heat away from your hand faster.
Plastic absorbs heat from your hand more quickly.
Plastic emits more radiation.
Which of these materials is the worst conductor of heat?
Copper
Aluminium
Water
Air
When you heat the top of a test tube of water with ice placed at the bottom, the ice does not melt quickly. Why?
Water is a very good conductor of heat.
Convection carries heat to the bottom efficiently.
Water is a poor conductor, so heat does not easily reach the ice.
Radiation transfers heat to the ice cube rapidly.
What causes convection currents in fluids?
Vibrations of atoms alone.
Free electrons moving rapidly.
Changes in density due to heating.
Radiation from the surroundings.
When water at the bottom of a beaker is heated, what happens to that water?
Its density increases and it sinks.
Its density decreases and it rises.
It becomes heavier and stays at the bottom.
It cools and sinks.
In a rectangular flask of water, which region should be heated to create an anticlockwise convection current?
Top right
Bottom right
Top left
Middle
Which of the following is NOT a feature of convection?
Occurs in liquids and gases
Caused by density changes
Can occur in solids
Responsible for ocean currents
Why does a radiator placed at the bottom of a room effectively heat the entire room?
Heat rises by radiation.
Convection currents circulate warm air upwards.
Cold air naturally moves upward.
Only conduction occurs.
What is unique about energy transfer by radiation?
It requires a medium to travel through.
It can occur in a vacuum.
It only happens in liquids.
It relies on density changes.
Which surface is the BEST emitter of radiation?
Shiny and smooth
White and rough
Black and matte
Silver and polished
Why is the radiator of a car engine often painted black?
To reflect heat better.
To reduce radiation.
To absorb heat from the surroundings.
To emit heat more efficiently.
Two identical boxes are left in the sun. One is black and one is white. Which statement is correct?
The white box heats up faster.
The black box absorbs radiation faster.
Both absorb radiation at the same rate.
The black box reflects radiation.
Which factor does NOT affect the rate at which an object emits radiation?
Surface area
Surface colour
Temperature
Mass
Why does an ice cube melt at room temperature?
It emits radiation faster than it absorbs.
It absorbs more radiation from warmer surroundings than it emits.
Radiation has no effect.
The molecules move to warmer regions.
Which of the following statements about radiation is correct?
All objects emit only visible radiation.
Only hot objects emit infrared radiation.
All objects emit infrared radiation.
Radiation requires particles to travel.
Why do elephants flap their ears to cool down?
To conduct heat to the ground
To increase radiation of heat away from the large surface area
To stop absorbing heat
To create conduction currents
What is the main reason a solar water heater has many thin pipes rather than one big pipe?
To reduce radiation losses
To increase conduction
To increase surface area for absorbing radiation
To make the system heavier
