Q32 (NDA-I/2017) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Thermal physics Answer Verified

Which one of the following statements is NO'f con ect ?

In the conduction mode of transference of heat, the molcculcs of solid pass heat from one molecule to another without moving from their positions

The amount of heat required to raise the temperature of a substance is called its specific heat capacity

The process ofheatti'ansfer in liquids and gases is through convection mode

The process of heat transfer from a body at higher temperature to a body at lower temperature without heating the space between them is known as radiation •n

Result

Your answer: — · Correct: B

Explanation

Statement 2 is incorrect because it defines 'heat capacity' rather than 'specific heat capacity'. Specific heat capacity is the amount of heat required to raise the temperature of a unit mass (e.g., 1 kg) of a substance by one degree Celsius or Kelvin. Heat capacity, by contrast, is the heat required for the entire mass of the object. Statement 1 is correct; in conduction, heat is transferred through molecular interactions or vibrations without the particles moving from their fixed positions [2]. Statement 3 is correct as convection is the primary mode of heat transfer in fluids (liquids and gases) through the actual movement of particles [2]. Statement 4 is correct; radiation involves heat transfer via electromagnetic waves and does not require a material medium, meaning it can transfer heat without warming the intervening space [2].

Sources

[1] Science-Class VII . NCERT(Revised ed 2025) > Chapter 7: Heat Transfer in Nature > In a Nutshell > p. 101
[2] Science-Class VII . NCERT(Revised ed 2025) > Chapter 7: Heat Transfer in Nature > Why is it more comfortable to wear white or light-coloured clothes during summers and dark-coloured clothes during winters? > p. 97

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Which one of the following statements is NO'f con ect ?

Explanation

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