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

‘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.

Define the term heat.

Define the term calorie. How is it related to joule (the S.I. unit of heat)?

Define one kilo-calorie of heat.

A bullet of mass 0.5 kg slows down from a speed of 5 m s-1 to that of 3 m s-1. Calculate the change in kinetic energy of the ball.

How much energy is gained by a box of mass 20 kg when a man, carrying the box waits for 5 minutes for a bus?

State two advantage of producing hydroelectricity.

State two disadvantages of producing hydroelectricity.

State the energy transformation on the following:

Electricity is obtained from solar energy.