Which one of the following statements is NOT correct?

[amp_mcq option1=”In the conduction mode of transference of heat, the molecules of solid pass heat from one molecule to another without moving from their positions.” option2=”The amount of heat required to raise the temperature of a substance is called its specific heat capacity.” option3=”The process of heat transfer in liquids and gases is through convection mode.” option4=”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.” correct=”option2″]

This question was previously asked in

UPSC NDA-1 – 2017

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Statement B is incorrect. The amount of heat required to raise the temperature of *one unit mass* of a substance by one degree Celsius (or Kelvin) is called its specific heat capacity. The amount of heat required to raise the temperature of a substance by one degree Celsius (or Kelvin), without specifying the mass, is called its heat capacity or thermal capacity. Statement A correctly describes conduction in solids, Statement C correctly describes convection as the primary mode of heat transfer in fluids, and Statement D correctly describes radiation as heat transfer via electromagnetic waves not requiring a medium.

Specific heat capacity is an intrinsic property of a material (per unit mass), while heat capacity depends on both the material and its total mass.

Conduction is heat transfer through direct molecular contact and vibrations. Convection is heat transfer through the movement of fluids. Radiation is heat transfer through electromagnetic waves.

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