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 33 of 38
- A. Zero
- B. Minimum
- C. Infinity
- D. Maximum
Explanation: Work done is the dot product of force and displacement. Hence, W = FscosθWhere s is the displacement.Since, θ = 0°As force is parallel to…
Correct answer: Maximum- A. 100 J
- B. -100 J
- C. 0
- D. 50 J
Explanation: m=2kg v=5m/s r=2m Fc= mv2/r eq (1) Fc =(2)(52) / 2 =50/2 =25N Work done= W= F.d eq (2) Displacement in semi circle arc=2r=2 (2) =4m.
Correct answer: 100 J- A. 250 J
- B. 50 J
- C. -250 J
- D. 125 J
Explanation: The energy stored in the spring is given by? E = 1/2 kx2. E = ½ (10)(5)2 . E = "125J".
Correct answer: 125 J- A. 25 J
- B. -75 J
- C. 75 J
- D. 50 J
Explanation: Given that; F1 = 5 N. F2 = 15 N. Displacement = 5 m. The work done by that force is the Force x Displacement in the direction of the…
Correct answer: 75 J- A. 4 J
- B. 8 J
- C. 2 J
- D. 12 J
Explanation: The work done by force can be calculated by: Force x Displacement in the direction of the force (F x d).
Correct answer: 4 J646. Work is a:
- A. Vector quantity
- B. Scalar quantity
- C. Sometimes scalar, sometimes vector
- D. None of these options is correct
Explanation: Work is a scalar quantity. It's a measure of the energy transferred when a force acts on an object, causing it to move a certain distance.
Correct answer: Scalar quantity- A. Electric field
- B. Conservative field
- C. Magnetic field
- D. None of these options is correct
Explanation: work done by a conservative force on a "closed path" is zero; that is, the work done by a conservative force on an object is zero if the…
Correct answer: Conservative field- A. 100 J
- B. 50 J
- C. -100 J
- D. -50 J
Explanation: F= 10 NS= 20 m Theta Θ = 60 degreesWork done W = FS cos theta W= [10][20][cos 60°]W= 200 *½ as cos 60°= ½ or 0.5 W= 100 J
Correct answer: 100 J- A. Friction
- B. Electric
- C. Magnetic
- D. Gravitational
Explanation: A conservative force is a force applied in moving a particle from one point to another, such that the net amount of force is independent…
Correct answer: Friction- A. 15 J
- B. 9 J
- C. 8 J
- D. 18 J
Explanation: Work done= force x distance(i-2j-3k)(2i-5j+k) multiply the coefficients of i then j then k and add them.
Correct answer: 9 J- 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