ICSE ICSE Class 8 - CISCE Question Bank Solutions

What is potential energy? State its unit.

Give one example of a body that has potential energy, in each of the following:

1. due to its position at a height.
2. due to its elongated stretched state.

Name the form of energy stored in a wound up spring of a watch.

Can a body possess energy even when it is not in motion? Explain your answer with an example.

Name the type of energy (kinetic or potential) possessed by the following A moving cricket ball.

Name the type of energy (kinetic or potential) possessed by the following A stone at rest on the top of a building.

Name the type of energy (kinetic or potential) possessed by the following A compressed spring.

Name the type of energy (kinetic or potential) possessed by the following A moving bus.

Name the type of energy (kinetic or potential) possessed by the following A bullet fired from a gun.

Name the type of energy (kinetic or potential) possessed by the following Water flowing in a river.

Name the type of energy (kinetic or potential) possessed by the following  A stretched rubber band.

Give an example to show the conversion of potential energy to kinetic energy when put in use.

Give reasons for the following Hammer drives a nail into the wood only when it is lifted up and then struck.

The potential energy of a body of mass 0.5 kg increases by 100 J when it is taken to the top of a tower from ground. If force of gravity on 1 kg is 10 N, what is the height of the tower?

A body of mass 60 kg is moving with a speed 50 m s_1. Find its kinetic energy.

A truck of mass 1000 kg, increases its speed from 36 km h^-1 to 72 km h^-1. Find the increase is its kinetic energy.

.............. is a process that involves direct conversion of a solid into its vapour on heating.

Describe the process of sublimation with examples.

What do you mean by sublimation? Explain with an example.

Why does the size of naphthalene balls decrease when left open?