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

What is the weight of a body placed at the centre of the earth?

What do you understand by work? Is work a scalar or a vector quantity?

In the following case write yes, if the work is being done and no if no work is being done.

A man trying to push a wall.

In the following case write yes, if the work is being done and no if no work is being done.

A man moving on the rough ground.

State two conditions when the work done by a force acting on a body is zero.

State the condition when the work done by the force is positive

State the condition when the work done by the force is negative.

A force F when acts on a body, displace it by a distance d in a direction at an angle θ with the direction of the force. Write down the expression for the work done by the force.

State two conditions for work to be done.

What is the S.I. unit of work? Define it.

Justify the statement. “Power can be expressed as the product of force and velocity.”

State the practical unit mainly used in mechanical engineering and write down its equivalent in watt.

What happens to the power if the time for doing work is reduced from t second to t/10 second?

State the S.I. and C.G.S. units of energy. How are they related?

Relate 1 KWh (kilowatt hour) with joule.

What is meant by equilibrium?

What do you mean by dynamic and static equilibrium? Give one example of each.

What is a couple?

One end of a spring is kept fixed while the other end is stretched by a force as shown in the diagram.

(i) Copy the diagram and mark on it the direction of the restoring force.
(ii) Name one instrument which works on the above principle.

A boy of mass 30 kg is fitting at a distance of 2 m from the middle of a see-saw. Where should a boy of mass 40 kg sit so as to balance the see-saw?