Question

Chapter: heat. Class: VII

F) Answer the following questions in detail:

1. Why do we wear woollen clothes in winter?

2. Why is mercury used in thermometer?

3. Describe the construction and functions of thermos flask.

4. Give three practical applications of thermal expansion of solids.

5. Write three modes of flow of heat giving examples.

6. How can you show convection taking place in air?

7. Give an activity to show that solids expand on heating.

8. Describe the construction of a mercury thermometer.

9. What are the three temperature scales?

10. How will you show that black surface is a better absorber of heat?​

Answer 1

Just click on that attachment pics ❤️

Answer 2

Answer:

lucidity. Synonyms: clearness, good sense, rationality, sanity. Antonyms: aberration, alienation, craziness, delirium, dementia, derangement, frenzy, hallucination, insanity, lunacy, madness, mania, monomania.