Question

D. Very Short Answer Questions:
1. What happens when an iron rim is heated?
2. Give an example of a change caused by pressure.
3. Name one metal that expands on heating and contracts on cooling.
4. Name two brittle substances.
5. Give two examples of irreversible changes that take place due to heating.
6. Give one use of expansion of an object on heating.​

Answer 1

Answer:

1) When iron rim is heated it expands and again contracts...

2) Change in direction Ex. If a box is pushed with some pressure then its direction is changed.

3) Iron

4) Concrete and Glass

5) i) Burning of paper and it turns to Ash.

ii) Cooking food

Answer 2

Answer:

1. The iron rim expands on heating

2. Pressing sponge

3. Iron

4. Glass and biscuit

5. Burning of a paper

6. Thermal expansion which is used in air condition system and oven