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 34 of 38
- 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- A. Parallel
- B. Perpendicular
- C. Anti parallel
- D. None of these
Explanation: When the direction of motion and force acting on body are opposite i.e anti parallel, the work done is said to be negative.
Correct answer: Anti parallel- A. 120 J
- B. 12 J
- C. 1.2 J
- D. 18 J
Explanation: Work done = Force x Distance moved. = 10 x (0.12) = 1.2 J
Correct answer: 1.2 J- A. 10,000 J
- B. -l000 J
- C. 12/31 J
- D. 500 J
Explanation: Work done, W is equal to the force f times the distance d, or W = fd.W = 50 x9.8x 20.W = "9,800 J".
Correct answer: 10,000 J- A. positive
- B. zero
- C. negative
- D. none of these
Explanation: B. The formula for work done on a body is; W = F × d cos θWhere,F = the force of gravitation applied by the earth.d = displacement between…
Correct answer: zero- A. Frictional force
- B. Gravitational force
- C. Centripetal force
- D. Elastic force
Explanation: Option C is correct since centripetal force acts on an object in a circular path. It always acts towards the center of the circular path.
Correct answer: Centripetal force- A. (M/2+m)gh
- B. (M+m)gh/2
- C. (M+ m/2)gh
- D. (M+m)gh
Explanation: Option D is correct since work done by man will be equal to the gravitational potential energy gained by bucket and rope.
Correct answer: (M+m)gh- A. 20 J
- B. 15 J
- C. 5 J
- D. 25 J
Explanation: The work done by the force F can be calculated using the formula W = ∫F.dy, where ∫F.dy represents the integral of the force F with…
Correct answer: 25 J- A. Reversible
- B. Non reversible
- C. Can be both
- D. None of them
Explanation: Remember that the work done by a conservative force is reversible.
Correct answer: Reversible- A. applied force is variable
- B. applied force is perpendicular to the motion
- C. applied force generated motion
- D. applied force is constant
Explanation: Work is equal to the product of force and displacement. So, work is only done by the applied force when this force produces motion.
Correct answer: applied force generated motion680. A force F = 7 - 2x + 3*x2 is applied on 2 kg body, work done to displace the body from x =0 to x=5 m
- A. 70 J
- B. 270 J
- C. 35 J
- D. 135 J
Explanation: To find the work done, we can integrate the force with respect to displacement.
Correct answer: 135 J