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Heat and Thermodynamics - SS2 Physics Past Questions and Answers - page 4

31

The efficiency of a heat engine is given by:

A

The input heat divided by the output work.

 

B

The output heat divided by the input work.

 

C

The input work is divided by the output heat.

 

 

D

The output work is divided by the input heat.

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32

The Carnot cycle is an idealised thermodynamic cycle that consists of:

A

Two isothermal and two adiabatic processes.

 

B

Two isothermal and two isochoric processes.

 

C

Two isochoric and two adiabatic processes.

 

 

D

Two isochoric and two isobaric processes.

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33

The third law of thermodynamics states that:

A

It is impossible to reach absolute zero temperature.

 

B

The entropy of a perfect crystal at absolute zero is zero.

 

C

Energy is conserved in all thermodynamic processes.

 

D

Heat cannot be completely converted into work.

 

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34

A heat engine takes in 2000 J of heat from a high-temperature reservoir and produces 800 J of work. How much heat is rejected to the low-temperature reservoir?

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35

A refrigerator operates between two reservoirs at temperatures of 5°C and 25°C. The refrigerator removes 500 J of heat from the cold reservoir. How much work is required for this process?

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36

A heat engine has an efficiency of 50% and takes in 1000 J of heat. How much work does the engine produce?

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37

In a refrigeration system, which component is responsible for changing the refrigerant from a high-pressure gas to a high-pressure liquid?

A

Compressor

 

 

B

Condenser

 

C

Expansion valve

 

D

Evaporator

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38

Which of the following statements is true about the coefficient of performance (COP) of a refrigerator or heat pump?

A

The COP of a refrigerator is always greater than the COP of a heat pump.

 

B

The COP of a heat pump is always greater than the COP of a refrigerator.

 

C

The COP of a refrigerator and a heat pump are always equal.

 

D

The COP of a refrigerator and a heat pump depends on the temperature difference between the reservoirs.

 

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39

In a heat pump, which component is responsible for absorbing heat from the external environment and transferring it to the indoor space?

A

Compressor

 

 

B

Condenser

 

C

Expansion valve

 

D

Evaporator

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40

Which of the following statements is true about the Carnot refrigeration cycle?

A

It operates between two temperature reservoirs and has the highest possible efficiency.

 

B

It operates between two temperature reservoirs and has the lowest possible efficiency.

 

C

It operates between multiple temperature reservoirs and has the highest possible efficiency.

 

D

It operates between multiple temperature reservoirs and has the lowest possible efficiency.

 

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