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 35 of 38
- A. Negative
- B. Positive
- C. Zero
- D. Maybe positive, maybe negative
Explanation: Option D is correct since students must note that generally friction is considered to be a dissipative force in nature that generally acts…
Correct answer: Maybe positive, maybe negative- A. 0.5 J
- B. 1 J
- C. 2 J
- D. 1.5 J
Explanation: To calculate the work done by a force, we can use the formula: Work = Force × Displacement × cos(θ) In this case, the force is given by F…
Correct answer: 2 J683. Work is a _.
- A. Vector quantity
- B. Scalar quantity
- C. Sometime scalar some time vector
- D. None of these
Explanation: Work is given as; W = F × d Work is the product of Force, and displacement, both of which are vectors.
Correct answer: Scalar quantity- A. Friction is zero
- B. Contact force is zero
- C. Gravity is zero
- D. All of these
Explanation: Since mg and N are perpendicular to velocity v and s, work done by these force is zero.
Correct answer: All of these- A. Negative
- B. Zero
- C. Positive
- D. None of these
Explanation: Correct Option:CThis option is correct because in case of horse and cart the applied force and the direction of displacement is same that…
Correct answer: Positive- A. 9J
- B. 0J
- C. -9J
- D. 20J
Explanation: Correct Option:CAs the force is given as,F=2i+3j+4kThe displacement d with initial point (x1,y1z1) and terminal point…
Correct answer: -9J- A. 50J
- B. 20J
- C. 22J
- D. 10J
Explanation: The work done is calculated using the formula: Work = Force x Distance x Cosine(angle)As the force is applied in the horizontal direction…
Correct answer: 20J688. A variable force F = x is applied what will be the work done in moving the particle from X= 0 to 1
- A. 2 J
- B. 1 J
- C. 0.5 J
- D. 5 J
Explanation: The work done in moving a particle from x=0 to x=1 when a variable force F=x is applied can be found by integrating the force over the…
Correct answer: 0.5 J- A. Can be zero
- B. Can be positive
- C. Can be negative
- D. All of these options are correct
Explanation: Work done by friction is always negative.
Correct answer: Can be negative- A. 75˚
- B. 60˚
- C. 45˚
- D. 30˚
Explanation: Option B is correct since we know that, W = FS cosθ Cosθ = W / FS Cosθ = 25 / 50 Cosθ = 1 / 2 θ = 60 Options A, C, and D are incorrect…
Correct answer: 60˚- A. Zero
- B. 196 J
- C. -196 J
- D. 48 J
Explanation: Option A is correct since gravitational force only works perpendicular to the ground, so no work is done against gravitational force.
Correct answer: Zero- A. Zero
- B. 196 J
- C. -196 J
- D. 48 J
Explanation: Work done against the Gravitational Force is zero if a body moves perpendicular to the gravitational field lines i.e.
Correct answer: Zero- A. Positive
- B. Negative
- C. Zero
- D. None of these options are correct
Explanation: If a spring is stretched, then the direction of the applied force and the direction of displacement are the same, and the angle between…
Correct answer: Positive- A. 13 J
- B. 15 J
- C. 0 J
- D. 14 J
Explanation: Here, d = (1-0, 4-1, 3-1) and d = (1, 3, 2) We know that W = Fd cos θ = (1, 2, 3)(1, 3, 2) {all unit vectors will be canceled because unit…
Correct answer: 13 J- A. -2000 J, 2000 J
- B. -2000 J, 1000 J
- C. 0 J, 2000 J
- D. -2000 J, 0 J
Explanation: Work done by the road = Fd = -200 X 10 = -2000J As the road does not move, work done by bicycle = Fd = F x 0 = 0J The final answer will be…
Correct answer: -2000 J, 0 J- A. Zero
- B. Minimum
- C. Infinity
- D. Maximum
Explanation: Explanation:The work done is calculated as the scalar product of force vector and displacement vector.
Correct answer: Maximum- A. Negative
- B. Positive
- C. Zero
- D. None of these
Explanation: According to the formula, W = FdcosθIf both force and displacement are opposite in direction, then θ = 180o W = Fd cos180oWe know cos 180o…
Correct answer: Negative- A. Joule
- B. Newton
- C. Watt
- D. None of these
Explanation: The SI unit of work and energy is the joule (J). Joule is defined as the work done by a force of one newton causing a displacement of one…
Correct answer: Joule- A. The body moves parallel to F
- B. The body moves opposite to F
- C. The body moves at right angles to F
- D. The centripetal and centrifugal forces balance each other
Explanation: Work done is zero when force is perpendicular to the displacement. Work done = Fdcosθ where θ is the angle between force and displacement.
Correct answer: The body moves at right angles to F- A. 10 J
- B. 2 J
- C. 5 J
- D. 20 J
Explanation: Correct option is D. According to Given data: Applied force =2N Displacement=10m Formula: Work done = force × displacement W = 2N × 10m W=…
Correct answer: 20 J