Work, Energy, and Power MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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A power tool does 2000 J of work in 10 seconds. What is its power rating?
A. 200 W
B. 20 W
C. 2000 W
D. 100 W
Answer: 200 W
What is the work done when lifting an object of 15 kg to a height of 4 meters? (Take g = 9.8 m/s²)
A. 588 J
B. 60 J
C. 392 J
D. 150 J
Answer: 588 J
In which case is work done by a force zero?
A. When the force is perpendicular to the direction of motion
B. When the force is parallel to the direction of motion
C. When the object is at rest
D. When the force and displacement are both zero
Answer: When the force is perpendicular to the direction of motion
Which of the following correctly describes a Joule?
A. The amount of work done when a force of one Newton displaces an object by one meter
B. The amount of power used when one Watt is applied for one second
C. The amount of energy required to lift a mass of one kilogram by one meter
D. The amount of force required to move a mass of one kilogram one meter
Answer: The amount of work done when a force of one Newton displaces an object by one meter
If a force of 60 N moves an object 3 meters and the direction of the force is parallel to the displacement, how much work is done?
A. 180 J
B. 60 J
C. 3 J
D. 20 J
Answer: 180 J
Which equation represents the work done on an object when a force is applied at an angle to the direction of motion?
A. W = Fd cos(θ)
B. W = Fd sin(θ)
C. W = Fd
D. W = Fd tan(θ)
Answer: W = Fd cos(θ)
What is the energy transformation in a wind-up toy?
A. Mechanical to Kinetic
B. Kinetic to Mechanical
C. Potential to Mechanical
D. Thermal to Mechanical
Answer: Potential to Mechanical
If a machine has a mechanical advantage of 10 and the input force is 50 N, what is the output force?
A. 500 N
B. 5 N
C. 50 N
D. 10 N
Answer: 500 N
Which of the following factors does not affect the amount of work done?
A. The magnitude of the force applied
B. The distance over which the force is applied
C. The direction of the force
D. The time taken to do the work
Answer: The time taken to do the work