Thermal Energy Test 2025

Front

What is convection?

Back

Convection is the transfer of heat through the movement of fluids (liquids and gases). Warm fluid rises while cool fluid sinks, creating a current.

Front

What is conduction?

Back

Conduction is the transfer of heat through direct contact between materials. It occurs best in solids where particles are closely packed.

Front

What is radiation?

Back

Radiation is the transfer of heat in the form of electromagnetic waves. It does not require a medium and can occur in a vacuum.

Front

What is thermal energy?

Back

Thermal energy is the total kinetic energy of particles in a substance, related to its temperature.

Front

How does heat transfer occur in a vacuum?

Back

Heat transfer in a vacuum occurs through radiation, as there are no particles to conduct heat.

Front

What is the role of air in convection currents?

Back

Air acts as a fluid in convection currents, where warm air rises and cool air sinks, creating a cycle.

Front

Why do solids conduct heat better than liquids and gases?

Back

Solids conduct heat better because their particles are closely packed, allowing for efficient energy transfer.

Front

What is an example of convection in everyday life?

Back

An example of convection is the heating of water in a pot, where warm water rises and cool water sinks.

Front

What happens to air temperature in a room as you move from the floor to the ceiling?

Back

The air temperature typically increases as you move from the floor to the ceiling due to convection.

Front

What is an example of radiation?

Back

An example of radiation is feeling warmth from the sun on your skin, even when you are not in direct contact with it.