(English Medium) ICSE Class 10 - CISCE Question Bank Solutions

State the law of conservation of energy.

What do you mean by degradation of energy?

Explain degradation of energy by taking two examples of your daily life.

The diagram below shows a claw hammer used to remove a nail : 

(i) To which class of lever does it belong ?
(ii) Give one more example of the same class of lever mentioned by you in (i) for which the mechanical advantage is greater than one.

Its moment of a force scalar or a vector quantity?

Name the physical quantity whose SI unit is Nm.

What is meant by a translational motion? Give one example.

What is the relationship between Nm and dyne cm?

Why does a spanner have a long handle?

Draw a neat labeled diagram to show the direction of two forces acting on a body to produce rotation in it. Also mark the point about which rotation takes place.

Give two examples of couple actions in our daily life.

P, Q and R are three forces which act as shown in fig.

The point O lies in the same plane. Given, P = Q = R = 10N

(i) Which force has the least moment about O? Give a reason.

(ii)Which force has the greatest moment about O? Give a reason.

State the conditions of equilibrium for a rigid body.

A uniform circular motion is an accelerated motion. Justify it.

Explain the difference between a uniform linear motion and a uniform circular motion.

Is the motion of moon around the earth in circular path an accelerated motion?

Does the earth move around the sun with a uniform velocity?

Name the force acting away from the centre of circular path.

What is the purpose of a machine?

Give an example for each of the following uses of a machine:

to obtain gain in force,