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

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?

Define the term intensity of a sound wave. State the unit in which it is measured.

‘The force needed to push a load up an inclined plane is less than the force needed to lift it directly’ Give a reason.

How is it possible to recognize a person by his voice without seeing him?

Name a machine which is used to multiply speed ?

.A man raises a box of mass 50kg to a height of 2m in 20s, while another man raises the same box to the same height in 50s. Compare:

(i) the work done, and

(ii) the power developed by them.

The power of a motor is 40 kW. At what speed can the motor raise a load of 20,000 N?

MULTIPLE CHOICE TYPE

In an electric cell which in use, the change in energy is from:

A box of weight 150 kgf has gravitational potential energy stored in it equal to 14700 J. Find the height of the box above the ground. (Take g = 9.8 N kg^-1)

A body of mass 5 kg falls from a height of 10 m to 4 m. Calculate:

The loss in potential energy of the body, 

A boy weighing 25 kgf climbs up from the first floor at height 3 m above the ground to the third floor at height 9m above the ground. What will be the increase in his gravitational potential energy? (Take g = 10 N kg ^-1)

A vessel containing 50 kg of water is placed at a height 15 m above the ground. Assuming the gravitational potential energy at ground to be zero, what will be the gravitational potential energy of water in the vessel? (g = 10 m s^-2)