Free Work and Energy MCQs with Answers
748 Work and Energy MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Work transfers energy when a force causes displacement, while kinetic energy, gravitational potential energy and power describe motion, position and the rate of energy transfer. The work-energy theorem links net work with change in kinetic energy, and efficiency accounts for energy losses rather than treating them as energy destruction.
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Read the Work and Energy notesFree MDCAT chapter notes with key terms748 questions · page 21 of 38
- A. 10 KW
- B. 20 kW
- C. 1000 W
- D. 10 MW
Explanation: To calculate the power of the engine, we can use the formula: Power = Force × Velocity First, let's find the force exerted by the engine…
Correct answer: 10 KW- A. 190 J
- B. 160 J
- C. 150 J
- D. 20 J
Explanation: The explanation of this question is given below;
Correct answer: 150 J- A. Zero
- B. 0.89 m/s
- C. 3.1 m/s
- D. 4.3 m/s
Explanation: In this kind of questions, we need to apply the principle of CONSERVATION OF MECHANICAL ENERGY.
Correct answer: 4.3 m/s- A. 11/15
- B. 11/9
- C. 15/11
- D. 9/11
Explanation: The explanation of this question has been added.
Correct answer: 15/11- A. 2J
- B. 4J
- C. 1J
- D. 8J
Explanation: The explanation of this question is given below:
Correct answer: 4J406. A particle of mass m at rest is acted upon by a force F for a time t. Its K.E after an interval t is
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: The explanation of this question Is given below:
Correct answer: Option C- A. 5880 watt
- B. 4410 watt
- C. 2205 watt
- D. 1960 Watt
Explanation: The explanation of this question is given below;
Correct answer: 1960 Watt- A. 2000 litre
- B. 1000 litre
- C. 1200 litre
- D. 100 litre
Explanation: The explanation of this question is: Power (P) is defined as the rate at which work is done, and it is measured in watts (W).
Correct answer: 1200 litre- A. 2000 W
- B. 22500 W
- C. 5000 W
- D. 2250 W
Explanation: The explanation for the question is: To calculate the average power of the engine during the given period, we can use the formula: Average…
Correct answer: 22500 W- A. 2/1
- B. 1/2
- C. 1
- D. 4/1
Explanation: The explanation of this question is: Let us assume that both men do W work.
Correct answer: 2/1- A. 10J
- B. 90J
- C. 270 J
- D. 180 J
Explanation: The explanation for the question is: To calculate the kinetic energy of the body we use the equation K.E = 1/2mv2By given data we will…
Correct answer: 270 J- A. 25%
- B. 15%
- C. 45%
- D. 75%
Explanation: The explanation of this question is: Since the car wastes 45kJ of energy, it uses 60 - 45 = 15 kJ Efficiency = output energy/input energy…
Correct answer: 25%- A. 20 J
- B. 10 J
- C. 5 J
- D. 0 J
Explanation: The explanation of this question is: Work = force x distance Force = mass x acceleration F = 2 x 5 = 10N W = 10 x 2 = 20J
Correct answer: 20 J- A. 1kwh>1erg>1J
- B. 1J>1erg>1kwh
- C. 1kwh>1J>1erg
- D. 1kwh=1J=1erg
Explanation: The explanation of this question is: 1KWh=3.6 ×106joules 1 joule=107 erg hence 1KWh>1joule>1erg
Correct answer: 1kwh>1J>1erg- A. The path taken by the suitcase
- B. The time taken by you in doing work
- C. Weight of the suitcase
- D. A and B
Explanation: let's explain each option: Option A The work done on an object does depend on the path taken.
Correct answer: A and B- A. Its potential energy increases and kinetic energy decreases during the falls
- B. Its potential energy is equal to the kinetic energy during the fall.
- C. The potential energy decreases and the kinetic energy increases during the fall
- D. The potential energy and kinetic energy is maximum while it is falling
Explanation: As the ball falls, its height decreases therefore potential energy P.E decreases, which converts into kinetic energy K.E by law of…
Correct answer: The potential energy decreases and the kinetic energy increases during the fall- A. Force
- B. Time
- C. Displacement
- D. All of these
Explanation: Option b) Time is the correct option that work is independent of. Let's explain each option: a) Force: Work is defined as the product of…
Correct answer: Time- A. Negative
- B. Constant
- C. Positive
- D. Zero
Explanation: Option d) Zero is the correct option. The work done by the centripetal force on a body moving in a circular path is zero.
Correct answer: Zero- A. 1100 watts
- B. 1300 watts
- C. 1000 watts
- D. 1200 watts
Explanation: To calculate the power of the pump, we can use the formula: Power (P) = Work done (W) / Time taken (t) The work done by the pump is equal…
Correct answer: 1200 watts- A. The light body
- B. The K.E. are equal
- C. The heavy body
- D. Data is incomplete
Explanation: If both their momenta are equal, this means the lighter body has more velocity, hence possesses greater kinetic energy.
Correct answer: The light body