Question

C. Short Answer Questions
1. How do the woollen clothes keep us warm in winter?
2. Is the body temperature of every person 37°C? Why?
3. What are insulators? Give two examples of insulators in our daily life.
4. What are conductors? Give two examples.
5. What is the use of silvering the walls of thermos flask?
6. Discuss why wearing more layers of clothing during winter keeps us warmer than wearing just one
thick piece of cloth.
7. For setting curd, a small amount of curd is added to warm milk. The microbes present in the curd
help in setting if the temperature of the mixture remains approximately between 35°C to 40°C.
At places, where room temperature remains much below the range, setting of curd becomes
difficult. Suggest a way to set curd in such a situation.
[NCERT Exemplar]​

Answer 1

Answer:

woolen clothes keep us warm in winter because wool is poor contidor of heat and it has air trapped between the fibres