AP ECET PHYSICS Multiple Choice Questions (MCQs)
AP ECET Physics Unit 4: Work, Power and Energy - MCQs
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1. The SI unit of work is:
- a) Joule
- b) Newton
- c) Watt
- d) Meter
Answer: a) Joule
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2. Work done is defined as:
- a) Force × Distance
- b) Force ÷ Distance
- c) Distance ÷ Force
- d) Distance × Speed
Answer: a) Force × Distance
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3. Power is the rate at which work is done. Its SI unit is:
- a) Joule
- b) Watt
- c) Newton
- d) Meter
Answer: b) Watt
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4. The work done by a force when the displacement is in the direction of the force is:
- a) Positive
- b) Negative
- c) Zero
- d) Infinite
Answer: a) Positive
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5. Kinetic energy of an object is given by the expression:
- a) \( \frac{1}{2}mv^2 \)
- b) \( mv \)
- c) \( \frac{1}{2}m^2v \)
- d) \( mgh \)
Answer: a) \( \frac{1}{2}mv^2 \)
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6. Potential energy of an object is given by the expression:
- a) \( \frac{1}{2}mv^2 \)
- b) \( mv \)
- c) \( mgh \)
- d) \( \frac{1}{2}m^2v \)
Answer: c) \( mgh \)
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7. The total energy of a system is the sum of:
- a) Kinetic energy and work
- b) Potential energy and work
- c) Kinetic energy and potential energy
- d) Kinetic energy, potential energy, and power
Answer: c) Kinetic energy and potential energy
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8. Which of the following is an example of potential energy?
- a) A moving car
- b) A stretched spring
- c) A rotating wheel
- d) A flowing river
Answer: b) A stretched spring
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9. The law of conservation of energy states that:
- a) Energy can be created or destroyed
- b) Energy is always converted into work
- c) Energy cannot be created or destroyed, only converted from one form to another
- d) Energy decreases in every process
Answer: c) Energy cannot be created or destroyed, only converted from one form to another
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10. The work-energy theorem states that:
- a) Work is proportional to power
- b) Work is equal to the change in potential energy
- c) The work done on an object is equal to the change in its kinetic energy
- d) Work is equal to the force applied
Answer: c) The work done on an object is equal to the change in its kinetic energy
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11. If a force of 10 N is applied to move an object 5 meters in the direction of the force, the work done is:
- a) 50 Joules
- b) 5 Joules
- c) 100 Joules
- d) 500 Joules
Answer: a) 50 Joules
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12. If the velocity of an object is doubled, the kinetic energy of the object becomes:
- a) Half
- b) Double
- c) Four times
- d) Eight times
Answer: c) Four times
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13. The unit of energy in the SI system is:
- a) Newton
- b) Watt
- c) Joule
- d) Meter
Answer: c) Joule
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14. When a body falls freely from a height, its potential energy is converted into:
- a) Kinetic energy
- b) Heat energy
- c) Sound energy
- d) Light energy
Answer: a) Kinetic energy
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15. The energy possessed by a body due to its motion is called:
- a) Potential energy
- b) Kinetic energy
- c) Thermal energy
- d) Chemical energy
Answer: b) Kinetic energy
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