Question

A loose woolen cloth keeps us warm in winter because :

• A. it produces large amount of heat.
• B. it prevents heat radiation from our body by conduction.
• C. it prevents heat radiation from our body by convection.
• D. it prevents heat radiation by the process of radiation.

Answer 1

The correct option is B

it prevents heat radiation from our body by conduction.

1. Conduction is the process of heat transfer from one point to another without the actual transfer of particles from their position.
2. The substances which allow the heat energy to flow through them easily are known as good conductors of heat.
3. The substances which do not allow the heat energy to flow through them easily are known as bad conductors of heat.
4. Woolen clothes are made up of woolen yarns, they contain a large amount of trapped air.
5. Since air is a bad conductor of heat it does not allow heat from our body to flow outward.
6. If the heat from our body is not flowing outward, our body feels warm after wearing woolen clothes.
   Hence option (B) is correct.