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

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)

Find the kinetic energy of a body of mass 1 kg moving with a uniform velocity of 10 m s^-1.

A car is running at a speed of 15 km h^-1 while another similar car is moving at a speed of 45 km h^-1. Find the ratio of their kinetic energies.