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

A bullet fired against a window glass pane makes a hole in it without any cracks while a stone striking the same glass pane smashes it; explain with reason.

State the principle of moments.

Give the units of couple.

Define the term momentum.

Explain why It is easier to knock down a boy who is standing on one foot than one who is standing on two.

Explain when we carry weight, on one hand, we bend on the other side.

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?