Work, Energy and Power - Question Bank

1. What is the work done by a force if it causes no displacement?
A) Maximum positive
B) Maximum negative
C) Zero
D) Depends on the force magnitude
2. The energy possessed by an object due to its deformation, like a stretched rubber band, is called:
A) Gravitational Potential Energy
B) Kinetic Energy
C) Elastic Potential Energy
D) Thermal Energy
3. If the net force acting on an object is zero, then the net work done on the object is:
A) Always positive
B) Always negative
C) Always zero
D) Can be positive or negative
4. Which law states that energy cannot be created or destroyed, only transformed from one form to another?
A) Newton's First Law
B) Work-Energy Theorem
C) Law of Conservation of Energy
D) Law of Conservation of Momentum
5. What is the unit of power in the imperial system, often used for engines?
A) Joule per second
B) Kilowatt
C) Horsepower
D) Watt
6. A body is pushed along a frictionless horizontal surface. The work done by gravity on the body is:
A) Positive
B) Negative
C) Zero
D) Depends on the distance
7. If an object is moving, it possesses:
A) Potential energy only
B) Kinetic energy only
C) Both potential and kinetic energy
D) No energy
8. Which quantity measures the rate at which energy is transferred or converted?
A) Work
B) Power
C) Energy
D) Efficiency
9. The ability to do work is defined as:
A) Force
B) Power
C) Energy
D) Momentum
10. What is the work done by the centripetal force on an object moving in a circular path?
A) Positive
B) Negative
C) Zero
D) Depends on the speed
11. If the speed of a moving object is reduced to half, its kinetic energy will be:
A) Reduced to one fourth
B) Reduced to half
C) Doubled
D) Quadrupled
12. A machine does 500 J of work in 10 seconds. What is its power output?
A) 5 J/s
B) 50 J/s
C) 0.5 W
D) 50 W
13. The energy stored in a chemical bond is an example of:
A) Kinetic energy
B) Gravitational potential energy
C) Elastic potential energy
D) Chemical potential energy
14. Which type of energy is associated with the motion of atoms and molecules within a substance?
A) Kinetic energy
B) Potential energy
C) Thermal energy
D) Chemical energy
15. What is the work done by the gravitational force when an object is lifted vertically upwards by a height h?
A) mgh
B) -mgh
C) 0
D) mg/h
16. If an object's mass is halved and its velocity is doubled, its kinetic energy changes by a factor of:
A) 1/2
B) 1
C) 2
D) 4
17. What is the power rating of a light bulb that consumes 100 Joules of energy in 1 second?
A) 0.01 W
B) 1 W
C) 10 W
D) 100 W
18. Which principle relates work and energy in a system?
A) Newton's Third Law
B) Conservation of Momentum
C) Work-Energy Theorem
D) Conservation of Mass
19. When is the work done by a force negative?
A) When the force is in the direction of displacement.
B) When the force opposes the direction of displacement.
C) When the force is perpendicular to displacement.
D) When there is no displacement.
20. The energy required to change the state of motion of an object is directly related to the:
A) Work done on the object
B) Power exerted
C) Potential energy
D) Mass of the object only
21. A force is applied at an angle of 90 degrees to the direction of displacement. The work done by the force is:
A) Positive
B) Negative
C) Zero
D) Maximum
22. Which of the following statements is true about power?
A) It is the total energy consumed.
B) It is the rate at which work is done.
C) It is the energy stored in an object.
D) It is the force applied over a distance.
23. If the displacement of an object is zero, the work done by any force acting on it is:
A) Positive
B) Negative
C) Zero
D) Infinite
24. What is the power of a person who lifts 10 kg of mass to a height of 5 m in 10 seconds? (g = 9.8 m/s^2)
A) 4.9 W
B) 9.8 W
C) 49 W
D) 98 W
25. The potential energy stored in a spring is given by the formula:
A) kx
B) 1/2 kx
C) kx^2
D) 1/2 kx^2
26. A spring has potential energy stored in it when it is:
A) At its natural length
B) Compressed or stretched
C) Moving at constant velocity
D) At rest
27. Which quantity is conserved in an isolated system when only conservative forces are doing work?
A) Kinetic energy
B) Potential energy
C) Mechanical energy
D) Total energy
28. The work done in lifting a body of mass m to a height h is:
A) mgh
B) mg/h
C) mh/g
D) g/mh
29. If the velocity of an object is doubled, its kinetic energy becomes:
A) Half
B) The same
C) Double
D) Four times
30. What is the work done when a force of 5 N acts on a body and displaces it by 2 m, with the angle between force and displacement being 60 degrees?
A) 5 J
B) 10 J
C) 2.5 J
D) 7.5 J
31. Which of the following is a unit of energy but not an SI unit?
A) Joule
B) Kilowatt-hour
C) Watt-second
D) Erg
32. When a body falls freely under gravity, its mechanical energy:
A) Increases
B) Decreases
C) Remains constant
D) Becomes zero
33. If the net work done on an object is positive, its kinetic energy:
A) Decreases
B) Increases
C) Remains constant
D) Becomes zero
34. The Work-Energy Theorem states that the net work done on an object is equal to the change in its:
A) Potential energy
B) Kinetic energy
C) Total energy
D) Momentum
35. The work done by a non-conservative force, like friction, is typically:
A) Zero
B) Positive
C) Negative
D) Independent of displacement
36. The work done by a conservative force is:
A) Dependent on the path taken
B) Independent of the path taken
C) Always negative
D) Always positive
37. Which of the following is equivalent to 1 Watt?
A) 1 Joule per second
B) 1 Newton meter
C) 1 Joule per meter
D) 1 Newton per second
38. If 100 J of work is done in 5 seconds, what is the power?
A) 5 W
B) 20 W
C) 100 W
D) 500 W
39. Power is defined as the rate of doing work or the rate of transfer of:
A) Force
B) Momentum
C) Energy
D) Velocity
40. What is the SI unit of power?
A) Joule
B) Watt
C) Newton
D) Volt
41. An object of mass 2 kg is at a height of 10 m above the ground. What is its gravitational potential energy (g = 9.8 m/s^2)?
A) 19.6 J
B) 98 J
C) 196 J
D) 20 J
42. What is the formula for gravitational potential energy near the Earth's surface?
A) 1/2 mv^2
B) F * d
C) mgh
D) GMm/r
43. Potential energy is the energy possessed by an object due to its:
A) Motion
B) Position or configuration
C) Temperature
D) Charge
44. What is the SI unit of energy?
A) Watt
B) Joule
C) Newton
D) Erg
45. An object of mass 5 kg is moving with a velocity of 10 m/s. What is its kinetic energy?
A) 25 J
B) 50 J
C) 250 J
D) 500 J
46. What is the formula for kinetic energy?
A) mgh
B) 1/2 mv^2
C) F * d
D) P * t
47. Work done is defined as the product of force and:
A) Velocity
B) Acceleration
C) Displacement in the direction of the force
D) Time
48. If a force of 10 N is applied to an object over a distance of 5 m in the direction of the force, what is the work done?
A) 5 J
B) 15 J
C) 50 J
D) 2 N
49. Which of the following is a scalar quantity?
A) Force
B) Velocity
C) Work
D) Momentum
50. What is the SI unit of work?
A) Watt
B) Joule
C) Newton
D) Pascal
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