Question

In solids transfer of heat occurs through

• A. convection
• B. conduction
• C. radiation
• D. vibration

Answer 1

The correct option is B

conduction

Correct option: (B)

Conduction

1. Heat transmission in solids occurs by conduction.
2. Through direct contact without mass mixing, heat is transferred from one body to another in this process.
3. Conduction is the method by which thermal energy is conveyed through collisions between surrounding atoms or molecules.

Explanation for incorrect options

(A): Convection

1. Convection involves the transfer of heat in the liquids and gases from a hotter location to a cooler one.
2. The actual movement of molecules or the transfer of mass both contribute to convection heat transfer.
3. For example: milk is heated in a pan.

(C): Radiation

1. The energy that emanates from a source and moves through space at the speed of light is referred to as radiation.
2. This energy has wave-like qualities and is accompanied by an electric field and a magnetic field.
3. Electromagnetic waves are another name for radiation.

(D): Vibration

1. A quick up-and-down or to-and-fro movement about a mean position is referred to as vibration.
2. Vibrations travel through a medium such as air and reach our ears where they are interpreted by the brain as sound.

Thus, in solids transfer of heat occurs through conduction.

Hence, option (B) is correct.