Question

STUDY QUESTIONS

7. Why are the telephone or telegraph wires lac summer kept slightly loose while in winter he are kept tight?

8. Describe principle and function of fire alam

9 (a) Define thermal expansion of liquids

(b) How can you say expansion of gases is very large as compared to the solids or the liquids?

10. (a) Define thermal expansion of gases

(b) How can you say different liquids have different rates of expansion for the same se in temperature?​

Answer 1

Answer:

7.Telephone wires are kept slightly loose when they are laid because heat. Heat makes metallic