ICSE ICSE Class 8 - CISCE Question Bank Solutions for Physics

Two identical rods of copper are heated to different temperatures — one by 5°C and the other by 10°C. Which rod will expand more?

One rod of copper and another identical rod of iron are heated to the same rise in temperature. Which rod will expand more? Give reason.

In the ball and ring experiment, if the ball after heating is left to cool on the ring for sometime, the ball again passes through the ring. Explain the reason.

Iron rims are heated before they are fixed on the wooden wheels.

Why is one end of a steel girder in a bridge kept on rollers instead of fixing it in pillar?

A metal plate is heated. State three factors on which the increase in its area will depend.

A cubical metal solid block is heated. How will its volume change?

State one application of thermal expansion of liquids.

Describe an experiment to showthat air expands on heating.

An empty glass bottle is fitted with a narrow tube at its mouth. The open end of the tube is kept in a beaker containing water. When the bottle is heated, bubbles of air are seen escaping into water. Explain the reason.

Describe an experiment to show that same volume of different liquids heated to same rise in temperature expand by different amounts.

100 ml of each of the following liquid is heated from 10°C to 50°C. Which will expand more : (a) water (b) benzene (c) alcohol?

Water is heated from 0°C to 4°C. Will it expand?

An iron washer is heated. State the effect on its mass.

An iron washer is heated State the effect on its density.

An iron washer is heated. State the effect on its external.

An iron washer is heated. State the effect on its internal diameter.

A liquid exerts pressure in all directions.

Gases exert pressure in all directions.

Higher we go, greater is the air pressure.