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 8 of 9
- 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- A. 1 : 1
- B. 2 : 1
- C. 4 : 1
- D. 1 : 2
Explanation: Correct option is A. Correct option is 1:1
Correct answer: 1 : 1- A. 45-degree
- B. 90 degree
- C. 0-degree
- D. 180 degree
Explanation: Work done is the dot product of force and displacement. Hence,Work done = F d cos θ.Since cos θ is maximum at 0 radians or degrees,the…
Correct answer: 0-degree- A. 20 J
- B. 21 J
- C. 22 J
- D. 23 J
Explanation: Explanation is given below.Small amount of work done dW in giving a small displacement dx is given by dW=x or dW=Fdxcos0∘ or…
Correct answer: 21 J- A. 0 J
- B. 10 J
- C. 45 J
- D. 20 J
Explanation: W=F.SW=(2i+3j+4k) . (5k)W= 4x5 = 20J Options A, B and C are incorrect
Correct answer: 20 J- A. 2000 J
- B. -2000 J
- C. 0 J
- D. 200 J
Explanation: The work done by a force on an object is given: W = F x d x cosθ where: W = work done by the force (in joules, J) F = magnitude of the…
Correct answer: -2000 J- A. It depends on time
- B. It is independent of time
- C. Both of these
- D. None of these
Explanation: The work done on an object is given by the equation: W = Fd cosθ where W is the work done, F is the force applied, d is the displacement…
Correct answer: It is independent of time- A. -10
- B. +10
- C. -18
- D. +18
Explanation: Work is a scalar quantity and work done is a dot product of force and displacement.The difference between the two pints will be our…
Correct answer: +10- A. 1500 J
- B. 3000 J
- C. 4500 J
- D. 5000 J
- E. 9, 500 J
Explanation: The thermodynamic work done is W = PdVAs dV = 0 for path b to c it will not contribute any work.The work done will come from path a to b…
Correct answer: 4500 J- A. 0°
- B. 60°
- C. 270°
- D. 360°
Explanation: The formula for work done is displacement multiplied by the force in the direction of the displacement thus we incorporate the angle…
Correct answer: 270°- A. Pushing a car to start it moving
- B. Lifting the weights.
- C. The moon Orbiting the earth.
- D. Writing an essay on a page.
Explanation: When the moon revolves around the earth, the displacement is normal to the direction of force on the moon.
Correct answer: The moon Orbiting the earth.