Question

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:

when we heated the iron ring expands making the hole Large when the iron cooled it would compress the slave making a stronger barrel wall

Answer 2

(1). Iron rim expands when it is heated.

(2). Changing in shape is one of the examples of a change caused by pressure.

(3). Gold expands on heating and contracts on cooling.

(4). Glass and concrete are examples of brittle substances.

(5). Some irreversible changes that take place due to heating are -

(i) Some objects get hot and also expand in size. Example - rubber.

(ii) Some objects get hot and begin to burn. Example - paper.

(6). Heat expansion is used in jet engine to seal the leakage in the fuel pipe as the metal expands on heating.