Work, Energy and Power Test Online MCQs

1. If the water falls from a dam into a turbine wheel 19.6 m below, then the velocity of water at the turbines, is (take g = 9.8 m/s²)

2. If the force applied is F and the velocity gained is v, then the power developed is:

3. Which one of the following is true?

4. A particle of mass m moving with velocity v collides with a stationary particle of mass 2m. Then the speed of the system after collision is:

5. A body is allowed to slide down a frictionless track freely under gravity. The track end in a semicircular shaped part of a diameter D. The height (minimum) from which the body must fall so that it completes the circle, is

6. A body of mass 5 kg has momentum of 10 kg m/sec. When a force of 0.2 N is applied on it for 10 sec, the change in its kinetic energy is

7. A spring 40 mm long is stretched by applying a force. If 10 N force is required to stretch the spring through one mm, then work done in stretching the spring through 40 mm is:

8. If a spring extends by x on loading, then energy stored by the spring is (if T is the tension in spring and k is spring constant)

9. When a ball is thrown up vertically with velocity v₀ it reaches a maximum height of h. If one wishes to triple the maximum height then the ball should be thrown with velocity?

10. A mass of 1 Kg 1 kg is hanging from a spring constant 1 N/m. If Saroj pulls the mass down by 2m. The work done by Saroj is

11. For inelastic collision between two spherical rigid bodies:

12. Two bodies of masses 0.1 kg and velocities they stick together. In 10 sec the combined mass travels

13. A shell of mass m moving with velocity v suddenly breaks into 2 pieces. The part having mass m/3 remains stationary. The velocity of other part will be:

14. A bullet of mass 10g leaves a riffle at an initial velocity of 1000 m/sec and strikes the earth at the same level with a velocity of 500 m/sec. The work in overcoming the resistance of air will be:

15. The kinetic energy of a body becomes four times its initial value. The new linear momentum will be