Question

A man is sitting inside a house during the winter season. The main mode of heat transfer from the man's body to the surroundings is

• A. Conduction
• B. Convection
• C. Radiation
• D. Evaporation

Hint:

Human body heat loss occurs by all three modes, but indoors during winter, \[ \boxed{ \text{Radiation is generally the dominant mode.} } \] Radiation does not require direct contact or a material medium.

Answer 1

The Correct Option is C

Step 1: Recall the modes of heat transfer. Heat can be transferred by
• Conduction,
• Convection,
• Radiation.

Step 2: Identify the dominant mode. A person sitting inside a room loses most of the body heat to the cooler surrounding walls and objects by thermal radiation. Hence, \[ \boxed{\text{Radiation}} \] is the dominant mode of heat transfer. Therefore, \[ \boxed{(C)} \] is the correct answer.