Which one of the following statements best defines the concept of heat?

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NDA-II 2024 (GAT) Official Paper (Held On: 01 Sept, 2024)
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  1. The transformation of energy from one form to another
  2. The conversion of energy into mass and vice-versa due to temperature difference
  3. The transfer of energy due to temperature difference
  4. The change in volume of a substance with temperature

Answer (Detailed Solution Below)

Option 3 : The transfer of energy due to temperature difference
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CONCEPT:

Heat

  • Heat is a form of energy transfer between systems or objects with different temperatures (thermal energy in transit).
  • It always flows from the hotter object to the cooler one, until thermal equilibrium is reached.
  • The SI unit of heat is the joule (J), but it is also commonly measured in calories (cal).

EXPLANATION:

  • Among the given options:
    • Option 1: "The transformation of energy from one form to another" is not specific to heat, as it applies to energy in general.
    • Option 2: "The conversion of energy into mass and vice-versa due to temperature difference" refers to a relativistic concept (E=mc2), not heat transfer.
    • Option 3: "The transfer of energy due to temperature difference" accurately describes heat.
    • Option 4: "The change in volume of a substance with temperature" refers to thermal expansion, not heat itself.

Therefore, the best definition for heat among the options provided is The transfer of energy due to temperature difference.

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