Free Work MCQs with Answers
169 Work 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 is done when a force produces displacement, with its value determined by the component of force along the displacement. The topic covers positive, negative and zero work, work by variable forces from force-displacement graphs, and the connection between net work and change in kinetic energy.
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169 questions · page 4 of 9
- 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: pAΔx- 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- A. Maximum
- B. Zero
- C. Minimum
- D. Negative
Explanation: This is correct because W = F·d·cosθ; when θ = 90°, cosθ = 0 ⇒ W = 0.
Correct answer: Zero- A. Nm
- B. kg·m²/s²
- C. J
- D. W
Explanation: This is correct because watt is the unit of power, not energy. Power is the rate of doing work.
Correct answer: W- A. 40 J
- B. 30 J
- C. 50 J
- D. 20 J
- E. 10 J
Explanation: The explanation for this question will be added soon.
Correct answer: 10 J- A. 50 units
- B. 75 units
- C. 125 units
- D. 155 units
- E. 200 units
Explanation: The explanation for this question will be added soon.
Correct answer: 200 units- A. The body moves parallel to F
- B. The body move opposite to F
- C. The body right angle to F
- D. Centripetal and centrifugal balance each other
Explanation: Option C is correct since the motion of the body moving in a circular path and the centripetal force act perpendicularly as shown in the…
Correct answer: The body right angle to F- A. 0.5 J
- B. 1 J
- C. 2 J
- D. 1.5 J
Explanation: When y = 0, F = 1 N. When y = 1, F = 2 N. Therefore the average value of F = (1 + 2)/2 = 1.5 N.
Correct answer: 1.5 J- A. Positive
- B. Negative
- C. Can be positive or negative
- D. None of these options are correct
Explanation: If a system is gaining energy / transfer of energy to the system occurs, then the work done on the system is said to be positive.
Correct answer: Positive- A. The body moves parallel to F
- B. The body moves opposite to F
- C. The body moves at right angle to F
- D. Centripetal and centrifugal balance each other
Explanation: For work to be done by a force, an object must move in the direction of the force.
Correct answer: The body moves at right angle to F- A. 5 J
- B. Zero
- C. 31.42 J
- D. 500 J
Explanation: No work is done on objects moving in circular motion. The reason for this is that the direction of motion of the body is perpendicular to…
Correct answer: Zero- A. Displacement
- B. Power
- C. Work
- D. Acceleration
Explanation: Area under any graph is the product of quantities on each axis. Since the product of Force and Displacement is work, option C is the…
Correct answer: Work- A. 250J
- B. 25J
- C. 2500J
- D. 25,000J
Explanation: Potential energy = Mgh Mg (weight) is given as 10N So, 250x10=2500.
Correct answer: 2500J