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 8 of 38
- A. Gradient of the tangent of the curve of P-V graph
- B. Gradient of the tangent of the curve of P-T graph
- C. Area of the curve under the P-V graph
- D. Area of the curve under the P-T graph
Explanation: To calculate the work done on the object, we must calculate the area under the curve of a P-V graph.
Correct answer: Area of the curve under the P-V graph- A. W2 > W1 > W3
- B. W1 > W2 > W3
- C. W2 > W3 > W1
- D. W1 > W3 > W2
Explanation: Wisobaric > Wisothermal > Wadiabatic Isothermal Process: In an isothermal process, the expansion of the gas occurs at a constant…
Correct answer: W2 > W1 > W3- A. Isothermal
- B. Adiabatic
- C. Isochoric
- D. Isobaric
Explanation: The correct answer is D, 'Isobaric'. In an isobaric process, the pressure remains constant, and the work done by the system involves a…
Correct answer: Isobaric- A. PV
- B. 3PV
- C. 2PV
- D. 4PV
Explanation: Work done = area under the P-V curve. W = LM x MN W = (2P-P) x (2V - V) W = P x V W = 1PV
Correct answer: PV- A. P∆U
- B. P∆A
- C. P∆V
- D. All are correct
Explanation: P∆V is the correct expression for work done by gas because it represents the amount of energy required to move the piston against the…
Correct answer: P∆V- A. 90°
- B. 0°
- C. 30°
- D. 60°
Explanation: Solution:- Use relation; W= Fd cosθ If θ is 60 degrees, cos(60°) = 1/2 = 0.5.
Correct answer: 60°- 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. its total energy
- B. the change in its kinetic energy
- C. the change in its potential energy
- D. the power delivered to it
Explanation: Positive net work speeds the body up and negative net work, as from friction, slows it down, and the theorem holds whatever forces are…
Correct answer: the change in its kinetic energy- 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. Output of machine
- B. Input of machine
- C. Efficiency
- D. Work
Explanation: Output=load*distance through which the load moves
Correct answer: Output of machine- A. equal to its translational kinetic energy
- B. half than its translational kinetic energ
- C. Double than its translational kinetic energy
- D. Four times than its translational kinetic energy
Explanation: The rotational kinetic energy (K_rot) of a hoop is equal to its translational kinetic energy (K_trans).
Correct answer: equal to its translational kinetic energy- A. K.E of hoop= K.E of disc
- B. K.E of hoop= 2 K.E of disc
- C. K.E of hoop= 0.5 K.E of disc
- D. K.E of hoop= 0.4 K.E of disc
Explanation: The rotational kinetic energy (K_rot) depends on both the mass and the distribution of mass around the axis of rotation, but for objects…
Correct answer: K.E of hoop= K.E of disc- A. Half its translational kinetic energy
- B. twice its translational kinetic energy
- C. four times is translational kinetic energy
- D. The same as its translational kinetic energy
Explanation: For a hoop rolling without slipping, its rotational kinetic energy is equal to its translational kinetic energy.
Correct answer: The same as its translational kinetic energy