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 11 of 38
- A. 4/5
- B. 5/4
- C. 5/6
- D. 1
Explanation: To find the power generated by each person, we use the formula: P = mgh/t, where m is mass, g is gravitational acceleration (constant for…
Correct answer: 1- A. Momentum increases 4 times and K.E increases 2 times
- B. Momentum and K.E remain the same
- C. Momentum increases 2 times and K.E increases constantly
- D. Momentum increases 2 times and K.E increases 4 times
Explanation: Option D is correct. When velocity is doubled, the momentum, which is calculated using p = m.v, increases by a factor of 2.
Correct answer: Momentum increases 2 times and K.E increases 4 times- A. Greatest at point 1
- B. Greatest at point 2
- C. Greatest at point 3
- D. The same at all points
Explanation: Using principle of conservation of energy. the loss in gravitational potential energy = gain in kinetic energy at all times.
Correct answer: The same at all points- A. 400 J
- B. 500 J
- C. 800 J
- D. 625 J
Explanation: %efficency=(output work/input work)*100 input work =(output work/%efficency)*100output work=Fd=50*10=500 putting values in the above…
Correct answer: 625 J- A. 3 m
- B. 6 m
- C. 9 m
- D. 10 m
Explanation: After the impact the 25% of energy is lost while 75% of its initial energy is left behind.P.E2 = 0.75P.E1mgh2= 0.75mgh1h2 = 0.75h1 =…
Correct answer: 9 m- A. Momentum and force
- B. Change of momentum and velocity
- C. Force and velocity
- D. All of these
Explanation: Option B is correct.The kinetic energy (KE) is also defined as the dot product of average momentum and velocity.
Correct answer: Change of momentum and velocity- A. 0.5 J
- B. 1.0 J
- C. 2.0 J
- D. 3 J
Explanation: K.E = (1/2) m v . v= (1/2) (0.1) (2 i + 4 j) . (2 i + 4 j)= (1/2) (0.1) (4 + 16) = (1/2) (0.1) (20) = 1 J
Correct answer: 1.0 J- A. Velocity
- B. Momentum
- C. Potential energy
- D. Kinetic energy
Explanation: A moving body need not have "c) Potential energy."A moving body may have velocity and momentum due to its motion, but it does not…
Correct answer: Potential energy- A. 100 W
- B. 980 W
- C. 50 W
- D. 5000 W
Explanation: To calculate the average power required to lift a mass, we can use the formula: Average Power = Work / Time The work done to lift a mass…
Correct answer: 980 W- A. Proton
- B. Electron
- C. Neutron
- D. alpha-particle
Explanation: The momentum of a particle is given by the product of its mass and velocity.
Correct answer: Electron- A. Horse power
- B. Electron volt
- C. Watt
- D. kW
Explanation: 1 horse power = 746 W1 kilo watt = 1000 W1 electron volt = 1.6 × 10-19 JThus the correct option is electron volt.
Correct answer: Electron volt- A. May increase
- B. May decrease
- C. Must increase
- D. Must decrease
Explanation: When gravity does -ve work "h" increases hence P.E increases.
Correct answer: Must increase- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Option D is correct as work done by the spring force = -1/2 kx² This work is done on both the blocks.
Correct answer: Option D- A. 9 kg
- B. 4/5 kg
- C. 2/5 kg
- D. 3/14 kg
Explanation: To find out how much coal is needed for 1 kWh, we start by converting kWh to kcal.
Correct answer: 2/5 kg- A. Work done by the boy against the gravitational force acting on the block
- B. Loss of energy stored in the spring minus the work done by the tension in the spring
- C. Work done on the block by the boy plus the loss of energy stored in the spring
- D. Work done on the block by the boy minus the work done by the tension in the spring
Explanation: Let xo be the initial extension of the spring. Then the initial energy stored in the spring is: ½kxo2The gain in gravitational potential…
Correct answer: Work done on the block by the boy plus the loss of energy stored in the spring- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Understanding the ProblemWe are given a force vector and the acceleration it produces.We need to find the mass of the body.Newton's second…
Correct answer: Option B- A. The Taj Mahal was commissioned by Shah Jahan in 1631, to be built in the memory of his wife Mumtaz Mahal, a Persian princess.
- B. Taj Mahal was commissioned by Shah Jahan in 1631, to be built in memory of his wife Mumtaz Mahal, a Persian princess.
- C. The Taj Mahal was commissioned by Shah Jahan in the 1631, to be built in memory of his wife Mumtaz Mahal, the Persian princess.
- D. Taj Mahal was commissioned by Shah Jahan in 1631, to be built in the memory of his wife Mumtaz Mahal, the Persian princess.
Explanation: The sentence is structured correctly, using the definite article "The" before the monument's name, and the preposition "in" before the year.
Correct answer: The Taj Mahal was commissioned by Shah Jahan in 1631, to be built in the memory of his wife Mumtaz Mahal, a Persian princess.- A. Ecstatic
- B. Belated
- C. Composed
- D. Contemporary
Explanation: The word that best fits in the blank is "ecstatic."So the complete sentence is:"As soon as the home team scored, the fans became ecstatic…
Correct answer: Ecstatic- A. The James Dillingham Young was very proud of two things which they owned.
- B. The James Dillingham Youngs was very proud of two things which theyowned
- C. The James Dillingham Youngs were very proud of two things which he owned.
- D. The James Dillingham Youngs were very proud of two things which they owned.
Explanation: The James Dillingham Youngs were very proud of two things which they owned.This option is correct.
Correct answer: The James Dillingham Youngs were very proud of two things which they owned.- A. Within hours, realizing that one may have gone too far, the victim handed himself in.
- B. Within hours, realizing that he may have gone too far, the victim handed him in.
- C. Within hours, realizing that he may have gone too far, the victim handed himself in.
- D. Within hours, realizing that he may have gone too far, the victim handed oneself in.
Explanation: Option (C) is the correct choice as it uses the reflexive pronoun "himself" appropriately to describe the victim's action of surrendering…
Correct answer: Within hours, realizing that he may have gone too far, the victim handed himself in.