ICSE ICSE Class 8 - CISCE Question Bank Solutions

State the effect of force F in of the following diagram.

State the S.I. unit of moment of force.

It is easier to swim in sea water than in river water. Explain the reason.

State two factors on which affect moment of force.

Icebergs floating on sea water are dangerous for ships. Explain the reason.

Explain why it is easier to lift a stone under water than in air.

In Fig. a force F is applied in a direction passing through the pivoted point O of the body. Will the body rotate? Give reason to support your answer.

Write the expression for the moment of force about a given axis of rotation.

What is a submarine? How can it be made to dive in water and come to the surface of water?

State one way to decrease the moment of a given force about a given axis of rotation.

What do you mean by the clockwise and anti-clockwise moment of force?

The steering wheel of a vehicle is of large diameter.

The hand flour grinder is provided with a handle near the rim.

It is easier to open the door by pushing it at its free end.

A potter turns his wheel by applying a force through the stick near the rim of wheel.

The density of aluminium is 2.7 g cm³. Express it in kg m⁻³.

What is thrust?

On what factors does the effect of thrust on a surface depend?

The density of alcohol is 600 kg m^-3. Express it in g Cm^-3.

A piece of zinc of mass 438.6 g has a volume of 86 cm³. Calculate the density of zinc.