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 3 of 9
- A. 25 J
- B. 200 J
- C. 287.5 J
- D. 50 J
Explanation: Work done = Area of triangle (0 to 10s)+Area of rectangle (10 to 30s)+Area of trapezium(30 to 35s)W=( 1/2×10×10)+(20×10)+(1/2) ×…
Correct answer: 287.5 J- A. 100 J
- B. 350 J
- C. 3430 J
- D. 5J
Explanation: The work done in climbing up the stairs is against gravity, therefore the work done is stored as potential energy, soWork = mghwhere m =…
Correct answer: 3430 J- A. 50 J
- B. 5 J
- C. 15 J
- D. 0 J
Explanation: The explanation of this question is: Work is a scalar quantity that can be represented as a dot product of 2 vector quantities force and…
Correct answer: 0 J- A. 3, 2, 1
- B. 2, 3, 1
- C. 2, 1, 3
- D. 1, 3, 2
Explanation: 1. Force and displacement are parallel to each other. So, θ =0, cosθ = 1 hence W1 = F2.
Correct answer: 3, 2, 1- A. 1 J
- B. 4 J
- C. 2 J
- D. 6 J
Explanation: From "X" to "Y" the displacement = 2(radius)= 2(20m) = 40mW = mgh = (0.01)(10)(40) = 4 J
Correct answer: 4 J- A. 38.2 J
- B. 39.2 J
- C. 392.1 J
- D. 3.92 J
Explanation: When a body is raised vertically, the work done against gravity is given by the formula:Work = Force × Distance × cos(θ).In this case, the…
Correct answer: 39.2 J- A. Zero
- B. 19.8 J
- C. 4.9 J
- D. 9.8 J
Explanation: W = F.dW = Fd cosθ = Fd cos90° = Fd (0) = 0Due to centripetal force the stone will move in a circular path.
Correct answer: Zero- A. 150 J
- B. 100 J
- C. 1500 J
- D. 750 J
Explanation: We know that, W=PE=mghP.E = mghP.E = (15)(10)(10) = 1500 J
Correct answer: 1500 J- A. Cyclic
- B. Free expansion
- C. Isochoric
- D. Adiabatic
Explanation: The correct answer is Isochoric. In an isochoric process, the volume of the system remains constant, which means there is no displacement…
Correct answer: Isochoric- A. 10.3 rad/s
- B. zero
- C. 100 rad/s
- D. 0.5 rad/s
Explanation: The work done in one complete revolution for a body moving at constant speed in a circular path is zero.
Correct answer: zero- A. Maximum
- B. Minimum
- C. Zero
- D. Negative
Explanation: The work done by a central force is zero because the force acts perpendicular to the displacement of the object it acts upon.
Correct answer: Zero- A. The Earth does zero work on satellite
- B. The Earth does positive work on satellite
- C. The Earth does negative work on satellite
- D. The concept of work is not applicable in circular motion.
Explanation: In the scenario of a satellite moving in a circular orbit at constant speed, the gravitational force exerted by the earth is always…
Correct answer: The Earth does zero work on satellite- A. 0
- B. mv.2πl
- C. (mv2/l).2πl
- D. (mv2/l).2πl2
Explanation: In uniform horizontal circular motion, the tension acts radially inward while the displacement is tangential, making the angle between…
Correct answer: 0- A. the body moves parallel to F
- B. the body move opposite to F
- C. the body move right angle to F
- D. centripetal and centrifugal balance each other
Explanation: Work done is defined as the product of force into the distance moved in the direction of force.
Correct answer: the body move right angle to F- A. 51 J
- B. Zero
- C. 31.42 J
- D. 500 J
Explanation: When the body completes one revolution, it comes back to its initial position, so its displacement becomes zero, and the work done will be…
Correct answer: Zero- A. Frictional force
- B. Elastic force
- C. Gravitattional force
- D. Centripetal force
Explanation: Option D is the correct answer. The centripetal force can do no work on the body on which it acts, as it keeps the object moving in a…
Correct answer: Centripetal force- A. 2125 J
- B. 2500 J
- C. 50 J
- D. 1125 J
Explanation: Work done = Force x parallel distance Force = mg : 50kg x 10 N/kg = 500 NDistance = 1.75m + 0.5m = 2.25 mW.D= 2.25m x 500 N = 1125 J
Correct answer: 1125 J- A. Zero.
- B. Positive.
- C. Variable.
- D. Negative.
Explanation: The work done by a force is calculated as the product of the force, the displacement, and the cosine of the angle between the force and…
Correct answer: Negative.- A. A
- B. B
- C. C
- D. D
Explanation: The correct answer is Option A. In a thermodynamic process, the system does zero work on its surroundings if there is no change in volume.
Correct answer: A- A. Zero.
- B. Infinity.
- C. Positive.
- D. Negative.
Explanation: In a marathon race, the runner is moving against the wind, which means the wind exerts a force opposite to the runner's motion.
Correct answer: Negative.