Mechanics: motion, force, work and energy - Question Bank

1. A machine does 1000 J of work in 5 seconds. Its power is:
A) 200 W
B) 5000 W
C) 0.2 W
D) 100 W
2. Which quantity is conserved in an isolated system according to the law of conservation of momentum?
A) Kinetic Energy
B) Total Energy
C) Momentum
D) Angular Momentum
3. When a conservative force does positive work, the potential energy of the system:
A) Increases
B) Decreases
C) Remains constant
D) Becomes zero
4. If the speed of a body doubles, its kinetic energy becomes:
A) Half
B) The same
C) Double
D) Four times
5. Which of the following is a unit of power?
A) Joule/second
B) Newton-meter
C) Kilogram-meter/second
D) Newton-second
6. The work done by the centripetal force on an object in uniform circular motion is:
A) Positive
B) Negative
C) Zero
D) Variable
7. In uniform circular motion, the acceleration is directed:
A) Away from the center
B) Towards the center
C) Tangentially
D) Along the velocity
8. The change in momentum of an object is equal to the:
A) Force applied
B) Impulse
C) Work done
D) Power delivered
9. Which of the following is a vector quantity?
A) Mass
B) Time
C) Velocity
D) Energy
10. The product of force and velocity is related to:
A) Work
B) Power
C) Momentum
D) Impulse
11. A body at rest will remain at rest unless acted upon by an external force. This is:
A) Newton's First Law
B) Newton's Second Law
C) Newton's Third Law
D) Archimedes' Principle
12. Which law relates force, mass, and acceleration?
A) First Law
B) Second Law
C) Third Law
D) Law of Conservation of Energy
13. If mass is kept constant, doubling the acceleration will:
A) Halve the force
B) Double the force
C) Quadruple the force
D) Keep the force the same
14. Which quantity represents the rate of change of velocity?
A) Speed
B) Acceleration
C) Displacement
D) Momentum
15. What is the SI unit of acceleration?
A) m/s
B) m/s^2
C) kg m/s
D) N
16. The work done by a force perpendicular to the displacement is:
A) Positive
B) Negative
C) Zero
D) Infinite
17. A body moving with constant velocity has a net force of:
A) Zero
B) Positive
C) Negative
D) Variable
18. What is the term for the tendency of an object to resist changes in its state of motion?
A) Momentum
B) Inertia
C) Acceleration
D) Velocity
19. Which of the following is a non-contact force?
A) Friction
B) Tension
C) Gravitational force
D) Normal force
20. A body is in equilibrium if the net force acting on it is:
A) Zero
B) Maximum
C) Minimum
D) Constant but not zero
21. If a force is applied for a very short duration, the product of force and time is called:
A) Work
B) Power
C) Impulse
D) Momentum
22. Impulse is equal to the change in:
A) Kinetic energy
B) Potential energy
C) Momentum
D) Work
23. What is the unit of impulse?
A) Newton
B) Newton-meter
C) Newton-second
D) Joule
24. The force required to keep an object moving in a circular path is called:
A) Centrifugal force
B) Centripetal force
C) Tension
D) Gravitational force
25. Centripetal force is a force that acts:
A) Away from the center of circular motion
B) Towards the center of circular motion
C) Tangentially to the circular path
D) In the direction of motion
26. Which type of friction is generally the strongest?
A) Rolling friction
B) Sliding friction
C) Static friction
D) Fluid friction
27. Friction is a force that opposes:
A) Motion
B) Rest
C) Acceleration
D) Gravity
28. When a ball is thrown upwards, its potential energy increases as it goes higher, while its kinetic energy:
A) Increases
B) Remains constant
C) Decreases
D) Becomes zero at the highest point
29. The principle of conservation of energy states that energy:
A) Can be created but not destroyed
B) Can be destroyed but not created
C) Can neither be created nor destroyed
D) Can be converted into mass
30. The formula for gravitational potential energy near the Earth's surface is:
A) 1/2 mv^2
B) mgh
C) mv
D) F x d
31. Potential energy is the energy possessed by a body due to its:
A) Motion
B) Rest
C) Position or Configuration
D) Temperature
32. What is the SI unit of energy?
A) Watt
B) Newton
C) Joule
D) Pascal
33. The formula for kinetic energy is:
A) mgh
B) 1/2 mv^2
C) mv
D) F x d
34. Kinetic energy is the energy possessed by a body due to its:
A) Position
B) Motion
C) Mass
D) Temperature
35. If work is done in 10 seconds and power is 50 W, the work done is:
A) 5 J
B) 50 J
C) 500 J
D) 0.2 J
36. What is the SI unit of power?
A) Joule
B) Watt
C) Newton
D) Hertz
37. Power is the rate of doing:
A) Work
B) Force
C) Momentum
D) Energy
38. If a force of 10 N acts on a body and displaces it by 5 m in the direction of the force, the work done is:
A) 5 J
B) 15 J
C) 50 J
D) 0.5 J
39. What is the SI unit of work?
A) Newton
B) Watt
C) Joule
D) Pascal
40. Work done is defined as the product of force and:
A) Velocity
B) Time
C) Displacement in the direction of force
D) Acceleration
41. Newton's third law of motion states that for every action, there is an equal and:
A) Independent reaction
B) Smaller reaction
C) Opposite reaction
D) Delayed reaction
42. What is the SI unit of momentum?
A) Newton-second
B) Joule-second
C) Kilogram-meter per second
D) Newton-meter
43. Momentum is the product of mass and:
A) Acceleration
B) Force
C) Velocity
D) Energy
44. What is the SI unit of force?
A) Joule
B) Watt
C) Newton
D) Pascal
45. Force is defined as the product of mass and:
A) Velocity
B) Acceleration
C) Momentum
D) Displacement
46. Newton's first law of motion is also known as the law of:
A) Momentum
B) Action and Reaction
C) Inertia
D) Conservation of Energy
47. Acceleration is the rate of change of:
A) Distance
B) Speed
C) Velocity
D) Time
48. Which of the following is a scalar quantity?
A) Velocity
B) Force
C) Speed
D) Displacement
49. What is the SI unit of distance?
A) Kilogram
B) Meter
C) Second
D) Ampere
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