Using Thermal Energy, Thermodynamics

Multiple Choice

What is the significance of thermal energy in everyday life?

• It helps in cooking food only

• It is used in heating systems, engines, and refrigerators

• It is only important for scientific experiments

• It is not useful in daily activities

Open Ended

Explain how thermal energy is transferred from a stove to the surrounding air in a heating system.

Multiple Choice

Which type of heating system uses ducts to distribute warm air throughout a building?

• Radiator system

• Electric heating system

• Forced-air system

• Solar heating system

Multiple Select

Select all the correct statements about passive solar heating systems.

• Materials inside a building absorb radiant energy from the Sun during the day.

• Thermal energy absorbed by materials helps keep the room warm at night.

• Solar collectors are used to absorb radiant energy from the Sun.

• A pump circulates hot water to radiators in rooms of the house.

Multiple Choice

Which statement best describes how thermal energy can be increased in a system according to the first law of thermodynamics?

• By adding heat or doing work on the system

• By removing heat from the system

• By isolating the system from its surroundings

• By converting all energy to mechanical energy

Multiple Select

Which of the following statements are true about isolated systems?

• No energy transfers occur across the boundary

• No work is done across the boundary

• Total energy remains constant

• Thermal energy can be converted to another form

Open Ended

Explain the difference between an isolated and a non-isolated system in terms of energy and work transfers.

Open Ended

Explain how thermal energy is converted to mechanical energy in a car engine, and why only a portion of the energy is used for mechanical work.

Multiple Choice

What is the main function of the crankshaft in an internal combustion engine?

• To burn fuel

• To move the piston up and down

• To convert the piston's up-and-down motion into rotational motion

• To cool the engine

Multiple Choice

What happens to the coolant gas after it absorbs thermal energy from inside the refrigerator?

• It is compressed and becomes warmer than the room

• It evaporates and cools the refrigerator

• It condenses and releases thermal energy into the room

• It is pumped out of the refrigerator

Open Ended

Describe the role of coolant in the functioning of a refrigerator and how its state changes during the refrigeration cycle.

Multiple Select

Which of the following are steps in the refrigeration cycle?

• Coolant absorbs thermal energy inside the refrigerator

• Coolant is compressed and becomes warmer than the room

• Coolant evaporates at a high temperature

• Coolant is pumped through condenser coils

Multiple Choice

Which statement best describes how an air conditioner operates?

• It cools warm air and returns it to the room, transferring thermal energy outdoors.

• It heats the air and returns it to the room, transferring thermal energy indoors.

• It absorbs cold air from outside and releases it inside.

• It only circulates air without changing its temperature.

Open Ended

Compare the operation of a heat pump in warm weather and cold weather. How does its function change?