Match the following. Column A Column B 1. Thermal expansion (a) electric iron 2. Bimetallic strip (b) fast 3. Boiling (c) slow 4. Evaporation (d) sensation of hotness or coldness 5. Heat (e) Gravesand's ball and ring experiment

1 - (e) Gravesand's ball and ring experiment. This experiment best illustrates that solid expands on heating. The apparatus consists of a metallic ring through which a metal ball can pass. After heating the metal ball at a high temperature, it can be seen that the ball is not able to pass the ring. 2 - (a) A bimetallic strip is made from two thin strips of different metals which expand by different amounts when heated. The automatic switch on and off system of an electric iron uses a thermostat that consists of a bimetallic strip. 3 - (b) Boiling is a fast process in which a substance changes its state from the liquid state to the gaseous state. It occurs at a temperature greater than the boiling point of the substance. 4 - (c) Evaporation is a slow process in which a substance changes its state from the liquid state to the gaseous state without boiling. The rate of evaporation depends on wind speed, temperature, humidity, and surface area. 5 - (d) Heat is a form of energy in transit, which enables the sensation of hotness and coldness. It transfers from a hot body to a cold body. Hence, the final answer is Column A Column B 1. Thermal expansion (e) Gravesand's ball and ring experiment 2. Bimetallic strip (a) electric iron 3. Boiling (b) fast 4. Evaporation (c) slow 5. Heat (d) sensation of hotness or coldness

E M B I B E

New Trends in ICSE Physics 8>Chapter 6 - Heat>EXERCISES>Q 3

EASY

8th ICSE

IMPORTANT

Earn 100

Choose the odd one out giving reason.
Solids, wood, liquids, gases.

Important Questions on Heat

MEDIUM

8th ICSE

IMPORTANT

New Trends in ICSE Physics 8>Chapter 6 - Heat>EXERCISES>Q 1

Match the following.

Column A	Column B
1. Thermal expansion	(a) electric iron
2. Bimetallic strip	(b) fast
3. Boiling	(c) slow
4. Evaporation	(d) sensation of hotness or coldness
5. Heat	(e) Gravesand's ball and ring experiment