Heat and Thermodynamics MCQ question and answer with solution

21

The heat required in calories to convert one gram of ice at 0°C to steam at 100°C is approximately

A) 80 B) 336 C) 720 D) 620

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Answer & Solution

Answer: Option C

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22

Cooling is done by

A) Flow of water B) Release of compressed gas C) Cooking gas D) Melting the solid

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Answer & Solution

Answer: Option B

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23

How much calories are there in a Joule?

A) 0.24 B) 0.48 C) 0.72 D) 0.96

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Answer & Solution

Answer: Option A

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24

14°F is equal to how many °C?

A) -10 B) +10 C) +20 D) -20

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Answer & Solution

Answer: Option A

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25

Steady state heat flow means-

A) Heat flow is negligible B) There is no temperature variation between the two bodies, the rate of heat flow is constant or the heat flow is not based on time C) The temperature of the bodies should rise evenly D) Body temperature rise at the same rate

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Answer & Solution

Answer: Option B

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26

Which one of the following statement is correct?

A) Any energy transfer that does not involve temperature difference in some way is not heat B) Any energy transfer always requires a temperature difference C) On heating, the length and volume of the object remain exactly the same D) Whenever there is a temperature difference, heat is the only way of energy transfer

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Answer & Solution

Answer: Option A

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27

Sun's heat reaches us by

A) conduction B) convection C) radiation D) reflection

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Answer & Solution

Answer: Option C

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28

Consider the following statements.
Assertion (A): If ice collects in the freezer, the cooling in the refrigerator is affected adversely.
Reason (R): Ice is a poor conductor.
Select the correct answer:

A) Both (A) and (R) are true and (R) is the correct explanation of (A) B) Both (A) and (R) are true, but (R) is not the correct explanation of (A) C) (A) is true, but (R) is false D) (A) is false, but (R) is true

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Answer & Solution

Answer: Option A

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29

Which statement is correct regarding the principle of energy conservation?

A) Energy can only be created B) Energy can only be destroyed C) Energy is created and also destroyed D) Energy is neither created nor destroyed

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Answer & Solution

Answer: Option D

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30

Heat transfer to any system is measured in the . . . . . . . .

A) Kilowatt B) Joule C) Degree Kelvin D) Ampere

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Answer & Solution

Answer: Option B

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Heat and Thermodynamics MCQ question and answer with solution | Physics Gk MCQs