ICSE ICSE Class 8 - CISCE Question Bank Solutions

Write the numerical value of the atmospheric pressure on the earth surface in pascal.

We do not feel uneasy even under the enormous atmospheric pressure. Give a reason.

Describe a simple experiment to illustrate that air exerts pressure.

Give reason for the following:
 A balloon collapses when air is removed from it.

Give reason for the following:

Water does not run out of a dropper unless its rubber bulb is pressed.

Give reason for the following :
Two holes are made in a sealed oil tin to take out oil from it.

How does the atmospheric pressure change with altitude?

In the household electric circuit, if one bulb is fused in a room, the other bulbs keep glowing. Explain the reason.

Describe the process of condensation with examples.

The density of a liquid decreases with increase in its temperature.

Arrange the following substances in order of their increasing density:
Iron, Cork, Brass, Water, Mercury.

How does the density of a liquid (or gas) vary with temperature?

A given quantity of a liquid is heated. Which of the following quantity will vary and how?
(a) mass, (b) volume and (c) density

A balloon filled with hydrogen rises in air. Explain the reason.

The density of air is 1.28 g/Iitre. Express it in g cm^-3  

The density of air is 1.28 g/Iitre. Express it in kg m^-3 

The dimensions of a hall are 10 m × 7 m × 5 m. If the density of air is 1.11 kg m^-3, find the mass of air in the hall.

The energy stored in water of a dam is the kinetic energy.

The potential energy of a body is due to its state of ................... and kinetic energy of body is due to its ...............

A boy lifts a luggage from height 2 m to 4 m. The potential energy will become