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

Name the CGS unit of work.

A boy pulls a box up to 10 m with a force of 5 kgf. Calculate the work done by him.

Calculate the amount of work done by a child carrying a bag of 20 kg when he moves a distance of 40 m in
(a) Vertical direction, and
(b) Horizontal direction

(a) Define power and name its unit.
(b) A girl weighting 50 kg climbs up 60 steps each of 20 cm height in 5 minutes. Calculate the power developed.

When an elevator starts to move down suddenly we experience 'weightlessness'. Explain.

A block of mass 20 kg is pulled up a slope (fig.12) with a constant speed by applying a force of 500 N parallel to the slope. A and B are initial and final positions of the block.
(a)    Calculate the work done by the force in moving the block from A and B.
(b)    Calculate the potential energy gained by the block.

How fast should a boy weighting 30 kg run so that his kinetic energy is 375 joule?

List any six forms of energy and write a short note on each of them.

What do you understand by 'potential energy' and 'Kinetic energy'? Give three examples of each to illustrate your answer.

A girl of mass 50 kg runs up a flight of 40 steps in 20 seconds. If each step in 20 cm high, calculate the power developed by the girl. (g= 10 ms^-2).

A bullet is of mass 'm' g and is moving with a velocity 'v' m/s. Find the kinetic energy of the bullet when
(a) The mass is doubled,
(b) The velocity is tripled.

Fill in the boxe to show the corresponding energy transformation.