Woollen clothes are used in winter because they are :

Question

Accepted Answer

Woollen clothes are used in winter primarily because they are bad conductors of heat. This characteristic makes them effective at keeping us warm in cold weather. Here's a detailed explanation supporting Option 2 as the correct answer:

1. **Explanation for Option 2 (Bad conductor of heat):**
   Wool is a poor conductor of heat, meaning it does not easily allow heat to pass through it. This property is crucial in winter clothing because it helps to trap the body's heat, preventing it from escaping into the colder external environment. The fibers in wool create tiny air pockets that act as insulators, maintaining warmth and providing a comfortable barrier against the cold. This insulating property is why woollen clothes are preferred in winter, as they help maintain body temperature by minimizing heat loss.

2. **Explanation for why other options are incorrect:**

- **Option 1 (Good conductor of heat):** If wool were a good conductor of heat, it would allow heat to pass through it easily, which would result in the body losing heat to the colder environment. This would make woollen clothes ineffective for keeping warm in winter, contradicting their purpose.

- **Option 3 (Soft fibre):** While wool can be soft and comfortable, softness is not the primary reason woollen clothes are used in winter. The main function of winter clothing is to provide warmth, which is achieved through insulation rather than softness. Softness is a desirable quality for comfort but does not contribute to the thermal insulation properties of wool.

- **Option 4 (Resiliency):** Resiliency refers to the ability of a material to return to its original shape after being stretched or compressed. While wool does have some resiliency, this property is not related to its ability to keep us warm. Resiliency might contribute to the durability and longevity of woollen garments but does not affect their thermal insulation capabilities.

In conclusion, the primary reason woollen clothes are used in winter is due to their poor heat conductivity, which helps retain body heat and provides warmth. This makes Option 2 the correct answer.