Chapter 11 – Work And Energy

A man is carrying the heavy luggage from one platform to the other of a Railway station but still according to the logics of science his work done is said to be zero. Can you opt out the correct reason?

When a body falls freely towards the earth, then its total energy

When a body like earth is moving in a circular path the work done in that case is zero because:

A car is accelerated on a leveled road and attains a velocity 4 times of its initial velocity. In this process, the kinetic energy of the car

The momentum of a bullet of mass 20 g fired from a gun is 10 kg m/s. The kinetic energy of this bullet in kJ will be:

Which one of the following is not the unit of energy?

The form of energy possessed by a flying bird is:

In the dams water is stored in the high reservoirs and then made to fall down. This falling water then rotates the turbines to generate electricity. In this energy conversion process can you tell the initial and final energies respectively?

A man of mass 50 kg jumps to a height of 1 m. His potential energy at the highest point is(g = 10 m/s2):

The type of energy possessed by a simple pendulum, when it is at the mean position is:

A body is falling from a height h. After it has fallen to a height of h/2, it will possess:

Two objects of masses 1 × 10-3kg and 4 × 10-3 kg have equal momentum. What is the ratio of their kinetic energies?

The work done on an object does not depend upon the:

An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass 3.5 kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same:

A microphone converts:

Which of the following energy change involves frictional force?
i. Potential energy to sound energy
ii. Chemical energy to heat energy
iii. Kinetic energy to heat energy
iv. Chemical energy to heat energy

Choose the correct option among the following:

When a body falls freely towards the earth, then its total energy:

In case of negative work, the angle between the force and displacement is:

Water stored in a dam possesses:

Which one of the following is not the unit of energy?

A body is falling from a height h, After it has fallen a height \(\frac{h}{2}\), it will possess:

The capacity of a body to perform work is called:

The rate of work done is called:

The capacity to perform work is obtained from :

An object of mass, m moving with velocity v has a kinetic energy of:

The gravitational potential energy of an object of mass, m raised through a height, h from the earth’s surface is given by:

If the displacement of the object is zero then the work done on an object by a force would be:

What is the energy possessed by an object due to its motion?

1 kJ equals ______

_______ formulated a law for the heating effect of electric current.