NEET UG PHYSICS Multiple Choice Questions (MCQs)
NEET UG Physics - Work, Energy, and Power
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46. Work done by a force is maximum when the angle between force and displacement is:
- a) 0°
- b) 90°
- c) 180°
- d) 45°
Answer: a
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47. The SI unit of work is:
- a) Joule
- b) Newton
- c) Watt
- d) Erg
Answer: a
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48. Which of the following is true about kinetic energy?
- a) It is inversely proportional to velocity.
- b) It depends on mass and the square of velocity.
- c) It is proportional to displacement.
- d) It is a scalar quantity independent of mass.
Answer: b
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49. The work-energy theorem states:
- a) Work done is equal to change in power.
- b) Work done is equal to the change in kinetic energy.
- c) Work done is equal to the total mechanical energy.
- d) Work done is equal to potential energy.
Answer: b
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50. The potential energy of a spring is given by:
- a) PE = 1/2 kx²
- b) PE = kx
- c) PE = 1/2 kx
- d) PE = kx²
Answer: a
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51. Power is defined as:
- a) Work done per unit time
- b) Force per unit time
- c) Displacement per unit time
- d) Energy per unit force
Answer: a
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52. Conservation of mechanical energy is valid when:
- a) Only conservative forces act.
- b) Non-conservative forces act.
- c) Frictional forces act.
- d) Gravitational force is absent.
Answer: a
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53. In a perfectly inelastic collision:
- a) Kinetic energy is conserved.
- b) Momentum is not conserved.
- c) Objects stick together after the collision.
- d) Velocity increases after the collision.
Answer: c
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54. In a vertical circle, the tension in the string is maximum at:
- a) The topmost point
- b) The bottommost point
- c) The midpoint
- d) A random point
Answer: b
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55. What is the work done by a force if displacement is zero?
- a) Infinite
- b) Maximum
- c) Zero
- d) Negative
Answer: c
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56. The power output of a machine is 500 W. How much work does it do in 10 seconds?
- a) 50 J
- b) 5000 J
- c) 500 J
- d) 50,000 J
Answer: b
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57. Which of the following is an example of a conservative force?
- a) Friction
- b) Air resistance
- c) Gravitational force
- d) Tension
Answer: c
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58. A body of mass m is moving with velocity v. Its kinetic energy is:
- a) mv
- b) 1/2 mv²
- c) mv²
- d) 1/2 v²
Answer: b
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59. In an elastic collision in one dimension:
- a) Both momentum and kinetic energy are conserved.
- b) Only momentum is conserved.
- c) Only kinetic energy is conserved.
- d) Neither momentum nor kinetic energy is conserved.
Answer: a
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60. Work done by a variable force can be calculated using:
- a) W = F · d
- b) W = ∫F dx
- c) W = F + d
- d) W = F ÷ d
Answer: b
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