Work Energy
Practice Work Energy MCQs from Physics — Science.
A spring is compressed by 0.1 m. If the spring constant is 100 N/m, the energy stored is:
A body of mass 10 kg is moving on a horizontal frictionless surface with velocity 5 m/s. Work done by gravity is:
A boy throws a ball of mass 200g vertically upwards. It reaches a height of 5m and comes back. Total work done by the boy is:
An engine of a vehicle delivers constant power P. The displacement of the vehicle from rest in time t is proportional to:
A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m. A force F is applied at one end of the rope. The work done by the rope on the block is:
A bullet of mass m hits a target and its velocity becomes half after penetrating a distance x. How much further will it penetrate before coming to rest?
A pump can lift 100 kg of water to a height of 100 m in 10 s. If efficiency is 50%, what is the input power?
A particle is moving in a circle of radius r under a force F = -k/r^2. The work done in one full revolution is:
A force F = (5i + 3j) N is applied on a body which displaces it by s = (2i - 1j) m. The work done is:
If the KE of a body is increased by 300%, by what percentage does the momentum increase?
The work done by a spring force when a spring is stretched from x1 to x2 is:
A body of mass m is thrown at an angle theta with the horizontal. At the highest point, its kinetic energy is:
A body is moved from rest along a straight line by a machine delivering constant power. The velocity at time t is proportional to:
The potential energy of a system increases if work is done:
If a body of mass m starts falling from point A at height h, what is its velocity at point B which is at height h/2?
A particle moves under the influence of a force F = cx from x=0 to x=x1. The work done is:
The stopping distance of a car is 40 m when moving at 20 m/s. If the same car moves at 40 m/s, the stopping distance is:
Water is falling from a waterfall at the rate of 100 kg/s on the blades of a turbine. If the height of the fall is 100 m, the power delivered to the turbine is (g=10):
A body of mass 5 kg is falling from a height of 10 m. What is its kinetic energy at the midpoint of its fall?