Physics – Class 11 Practice Test 4

1. For a body moving from position Xa to position Xb under a variable force, what is the work done?

2. The kinetic energy of a body is ‘K’. If one-fourth of its mass is removed and velocity is doubled, the new kinetic energy will be _____

3. What are the types of kinetic friction?

4. A body is projected up vertically with a velocity of 60 m/s. What percentage of its initial kinetic energy is converted into potential energy after 3 seconds? (Take g = 10 m/s²)

5. For the given diagram, choose the correct statement. Consider frictional forces absent.

6. The area under the force (F) versus displacement (x) graph gives work.

7. A motor is used to deliver water through a pipe. Let the motor have a power P initially. To double the rate of flow of water through the pipe, the power is increased to P’. What is the value of P’/P?

8. The length of a smooth inclined plane of 30-degree inclination is 5 m. The work done in moving a 10 kg mass from the bottom of the inclined plane to the top is _____ Joules. (Assume g = 10m/s²)

9. An external force is acting on a system, the work done on the system is change in its kinetic energy.

10. For a body of mass “m” on a rough inclined plane with a constant but arbitrary coefficient of friction as shown in the figure, what is the angle of repose if the net downward force is donated as “F”. Let “g” be the acceleration due to gravity and “u” be the coefficient of friction.