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 29 of 38
- A. 10.3 rad/s
- B. zero
- C. 100 rad/s
- D. 0.5 rad/s
Explanation: The work done in one complete revolution for a body moving at constant speed in a circular path is zero.
Correct answer: zero- A. Maximum
- B. Minimum
- C. Zero
- D. Negative
Explanation: The work done by a central force is zero because the force acts perpendicular to the displacement of the object it acts upon.
Correct answer: Zero- A. The Earth does zero work on satellite
- B. The Earth does positive work on satellite
- C. The Earth does negative work on satellite
- D. The concept of work is not applicable in circular motion.
Explanation: In the scenario of a satellite moving in a circular orbit at constant speed, the gravitational force exerted by the earth is always…
Correct answer: The Earth does zero work on satellite- A. 0
- B. mv.2πl
- C. (mv2/l).2πl
- D. (mv2/l).2πl2
Explanation: In uniform horizontal circular motion, the tension acts radially inward while the displacement is tangential, making the angle between…
Correct answer: 0- A. the body moves parallel to F
- B. the body move opposite to F
- C. the body move right angle to F
- D. centripetal and centrifugal balance each other
Explanation: Work done is defined as the product of force into the distance moved in the direction of force.
Correct answer: the body move right angle to F- A. 51 J
- B. Zero
- C. 31.42 J
- D. 500 J
Explanation: When the body completes one revolution, it comes back to its initial position, so its displacement becomes zero, and the work done will be…
Correct answer: Zero- A. Frictional force
- B. Elastic force
- C. Gravitattional force
- D. Centripetal force
Explanation: Option D is the correct answer. The centripetal force can do no work on the body on which it acts, as it keeps the object moving in a…
Correct answer: Centripetal force- A. 2125 J
- B. 2500 J
- C. 50 J
- D. 1125 J
Explanation: Work done = Force x parallel distance Force = mg : 50kg x 10 N/kg = 500 NDistance = 1.75m + 0.5m = 2.25 mW.D= 2.25m x 500 N = 1125 J
Correct answer: 1125 J- A. Zero.
- B. Positive.
- C. Variable.
- D. Negative.
Explanation: The work done by a force is calculated as the product of the force, the displacement, and the cosine of the angle between the force and…
Correct answer: Negative.- A. A
- B. B
- C. C
- D. D
Explanation: The correct answer is Option A. In a thermodynamic process, the system does zero work on its surroundings if there is no change in volume.
Correct answer: A- A. Zero.
- B. Infinity.
- C. Positive.
- D. Negative.
Explanation: In a marathon race, the runner is moving against the wind, which means the wind exerts a force opposite to the runner's motion.
Correct answer: Negative.- A. Mass of the object.
- B. Weight of the object.
- C. Paths taken by the object.
- D. Change in height of the object.
Explanation: The correct answer is that the work done by the gravitational field is independent of the paths taken by the object.
Correct answer: Paths taken by the object.- A. I only.
- B. II only.
- C. III only.
- D. I and II.
Explanation: In physics, work done by a force on an object is positive when the force has a component in the direction of the object's displacement.
Correct answer: I only.- A. Zero
- B. Infinite
- C. Positive
- D. Negative
Explanation: In thermodynamics, when a system expands, it performs work on its surroundings.
Correct answer: Positive- A. I only
- B. II only
- C. I and II
- D. II and III
Explanation: The correct answer is Option D: II and III.II. Work done against the force of friction is negative because friction always acts in the…
Correct answer: II and III- A. Zero.
- B. Infinite.
- C. Positive.
- D. Negative.
Explanation: The correct answer is that the work done by the wind on the birds is positive.
Correct answer: Positive.- A. - pΔx
- B. - pAΔx
- C. pΔx
- D. pAΔx
Explanation: Work Done by a Gas: In thermodynamics, when a gas expands, it does work on its surroundings.
Correct answer: pAΔx578. The work done during expansion of a gas is independent of pressure if the expansion takes place
- A. isothermally
- B. adiabatically
- C. isobarically
- D. in none of the above cases
Explanation: In thermodynamics, work done during the expansion of a gas generally depends on pressure changes.
Correct answer: in none of the above cases- A. 100 J
- B. 150 J
- C. 200 J
- D. 250 J
Explanation: This is correct because work done = mgh = 5 × 10 × 4 = 200 J.
Correct answer: 200 J- A. 15 J
- B. 20 J
- C. 50 J
- D. 100 J
Explanation: This is correct because work = force × displacement = 10 × 5 = 50 J.
Correct answer: 50 J