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

A weight lifter lifted a load of 200 kgf to a height of 2.5 m in 5 s. Calculate:

1. the work done, and
2. the power developed by him. Take g = 10 N kg^-1

A machine raises a load of 750 N through a height of 16 m in 5 s. calculate:

1. energy spent by machine,
2. power at which the machine works.

A boy of weight 40 kgf climbs up the 15 steps, each 15 cm high in 10 s and a girl of weight 20 kgf does the same in 5 s. Compare:

1. the work done, and
2. the power developed by them. Take g = 10 N kg^-1.

A water pump raises 50 litres of water through a height of 25 m in 5 s. Calculate the power of the pump required.

(Take g = 10 N kg^-1 and density of water = 1000 kg m^-3)

Name the forms of energy which a wound-up watch spring possesses.

Name three factors on which the deviation produced by a prism depends and state how does it depend on the factors stated by you.

How does the deviation produced by a triangular prism depend on the colours (or wavelengths) of light incident on it?

Which colour of white light travels fastest in glass?

In following figure  shows a thin beam of white light from a source S striking on one face of a prism.

Complete the diagram to show effect of prism on the beam and to show what is seen on the screen.

In following diagram shows a thin beam of white light from a source S striking on one face of a prism.

A slit is placed in between the prism and the screen to pass only the light of green colour. What will you then observe on the screen?

In following diagram  shows a thin beam of white light from a source S striking on one face of a prism.

 What conclusion do you draw from the observation in part (b) above?

If a monochromatic beam of light undergoes minimum deviation through an equiangular prism, how does the beam pass through the prism, with respect to its base?

(i) Draw a diagram to show the splitting of white light by a prism into its constituent colour.
(ii) Draw another diagram to show how the colours of spectrum of white light can be combined
to give the effect of white light.

Write the approximate wavelengths for blue.

Why are the waves mentioned by you not audible to us?

To detect the obstacles in their path, bats produce ______.

Draw a graph between displacement from mean position and time for a body executing free vibrations in vacuum.

Mechanical advantage (M.A.), load (L) and effort (E) are related as ______.

State the incorrect statement: 

A force of 5 kgf is required to cut a metal sheet. A pair of shears used for cutting the metal sheet has its blades 5 cm long, while its handles is 10 cm long. What effort is needed to cut the sheet?