Current set NDA-I · 2018 Q1

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Q1 (NDA-I/2018) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Thermal physics Answer Verified

Which one of the following statements 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

Result

Your answer: — · Correct: A

Explanation

In thermodynamics, heat is strictly defined as energy in transit due solely to a macroscopic temperature difference between two systems or objects.

Option A: Correct. If energy is transferred by means other than a temperature difference (e.g., mechanical work, electrical work), it is not classified as heat.
Option B: Incorrect. Energy can be transferred via work without requiring any temperature difference.
Option C: Incorrect. Heating typically causes thermal expansion, which increases an object's length and volume.
Option D: Incorrect. Even when a temperature difference exists, energy can still be transferred simultaneously via work or mass transfer.

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Which one of the following statements is correct ?

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