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 6 of 9
- A. 100 J
- B. 1.875 J
- C. 18.75 J
- D. 187.5 J
Explanation: W.d= force x distance f= mg ; mass of snake will be used as work is being done on it and we should convert it to kg so m, 0.075 kg x 10 =…
Correct answer: 1.875 J- A. 200 J
- B. 50 J
- C. 20 J
- D. 100 J
Explanation: Work done = force x distance 20 x 5 = 100J
Correct answer: 100 J- A. 100 J
- B. 150 J
- C. 50 J
- D. 200 J
Explanation: WD = f x d cos θ For horizontal distance let θ be 90˚ 10 x 10 x cos90 = 0 For vertical distance, θ is 0˚ 10 x 10 x cos0 = 100 Net work…
Correct answer: 100 J- A. 9 J
- B. 0
- C. -9 J
- D. 20 J
Explanation: WD = f x d d =( 1i + 2j + 3k) - (2i +3 j + 4k) = (-1i -1j -1k) WD = (2i + 3j + 4k) + (-1i -1j -1k) (2x - 1) + (3x - 1) + (4x - 1) = -9J
Correct answer: -9 J- A. Zero
- B. More than zero
- C. Less than zero
- D. None of these options are correct
Explanation: In a conservative field, the work done is independent of path followed by a body in a closed path.
Correct answer: Zero- A. Positive
- B. Negative
- C. Zero
- D. None of these options are correct
Explanation: Since the applied force in the spring and the expansion of the spring is in the same direction.
Correct answer: Positive- A. 4.36kJ
- B. 5.17kJ
- C. 8.91kJ
- D. 9.82kJ
Explanation: Option A : Work done is 5.17kJ not 4.36kJ Option : B Option C : Work done is 5.17kJ not 8.91kJ . Option D : Work done is 5.17 kJ not 9.82kJ.
Correct answer: 5.17kJ- A. Positive
- B. Negative
- C. Zero
- D. None of these
Explanation: Option A : The car is moving and suddenly when brakes are applied, the car stops and before stopping it comes a little backwards with a…
Correct answer: Negative- A. 50 J
- B. 75 J
- C. 25 J
- D. 100 J
Explanation: Net force: 10NWork done:f x d=10 x 5=50N
Correct answer: 50 J- A. Positive
- B. Negative
- C. Zero
- D. None of these
Explanation: The force is perpendicular to the displacement. Hence, work done is zero.
Correct answer: Zero- A. 75°
- B. 60°
- C. 45°
- D. 35°
Explanation: W = fd cos θIf the force is being exerted at an angle θ to the displacement, the work done is W = fd cos θ.Re arranging the formula given…
Correct answer: 60°- A. 100J
- B. 50J
- C. -50J
- D. -100J
Explanation: At the initial position, x = 10, force f = 20. At the final position, x = 0, and f = 0.
Correct answer: -100J- A. 79.4J
- B. 97.54J
- C. 105.25J
- D. 81J
Explanation: Work done = 0.15*(60*9.8)*0.9 J = 79.4 J
Correct answer: 79.4J- A. 0 degrees
- B. 30 degrees
- C. 45 degrees
- D. 60 degrees
Explanation: Given that W = 25J, F = 5N, and s = 10m, cos = W / (Fs) cos = 25 / 50 cos = 1 / 2 θ = cos-1 (0.5) θ = 60o
Correct answer: 60 degrees- A. Maximum
- B. Zero
- C. Minimum
- D. Infinity
Explanation: According to the formula, Work Done = Force x Displacement In which force and displacement should be in same direction.
Correct answer: Zero- A. 13 J
- B. 15 J
- C. Zero
- D. -13 J
Explanation: .d = d2 + d1 d = 1i + 4j + 3k - ( 1j + 1k) d = 1i + 4j + 3k - 1j -1k d = 1i + 3j + 2k W = F d W = ( i + 2j + 3k ) ( i + 3j + 2k ) W = ( 1…
Correct answer: 13 J- A. 20 J
- B. 21 J
- C. 23 J
- D. 22 J
Explanation: Force is (0.5x + 10) which when multiplied by 2 gives us 21.
Correct answer: 21 J- A. Positive
- B. Zero
- C. Negative
- D. None of these
Explanation: because product of force and distance is zero
Correct answer: Zero- A. 50 J
- B. 49 J
- C. -49 J
- D. 55 J
Explanation: Option C is correct. Work=m(-g)h 1kg x -9.8 x 5= -49Joule
Correct answer: -49 J- A. 70
- B. 270
- C. 35
- D. 135
Explanation: he work W is equal to the force f times the distance d, or W = fd. If the force is being exerted at an angle θ to the displacement, the…
Correct answer: 135