Thermal Expansion in Solids

Q.

Solids ___________ on heating and __________ on cooling.

Q.

The decrease in volume of a substance due to cooling is called__________.

Q.

Why do telephone wires sag in summer?

Q. When a container's metal lid is stuck, we put it in hot water for a while and then it becomes easier to open it. Why is it so?

1. The hot water cleans it.
2. The hot water will polish the metal.
3. The heat expands the metal.
4. The heat contracts the metal.

Q.

Substances decrease in size on____________(heating/cooling) and contract.

Q. Solids expand on _________, and contract on ________.

1. heating, cooling
2. cooling, heating
3. cooling, crushing
4. heating, grinding

Q. Which of the following expands the most when heated?

1. Solids
2. Liquids
3. Gases
4. Sand

Q.

Solids contract on ________.

Q. When a container's metal lid is stuck, we put it in hot water for a while and then it becomes easier to open it. Why is it so?

1. The hot water cleans it.
2. The hot water will polish the metal.
3. The heat contracts the metal.
4. The heat expands the metal.

Q. In case of , heat transfer occurs predominantly through conduction.

1. liquids
2. gases
3. solids

Q. Solids and liquids expand on and contract on .

1. heating
2. crushing
3. grinding
4. cooling