Work, Energy, and Power MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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Which of the following is an example of energy conversion from potential to kinetic energy?
A. A ball rolling down a ramp
B. A car speeding up on a straight road
C. A book on a shelf
D. A spinning top
Answer: A ball rolling down a ramp
If the work done on an object is 100 J and the time taken is 20 seconds, what is the power output?
A. 5 W
B. 10 W
C. 20 W
D. 50 W
Answer: 5 W
What is the kinetic energy of an object with a mass of 2 kg moving at a speed of 3 m/s?
A. 9 J
B. 18 J
C. 12 J
D. 6 J
Answer: 9 J
The efficiency of a machine is given by the ratio of:
A. Useful work output to total work input
B. Total work input to useful work output
C. Useful work output to mechanical advantage
D. Work input to work done
Answer: Useful work output to total work input
What is the work done to lift a 5 kg object to a height of 8 meters? (Take g = 9.8 m/s²)
A. 392 J
B. 490 J
C. 400 J
D. 100 J
Answer: 392 J
The energy possessed by a stationary object due to its position is called:
A. Potential energy
B. Kinetic energy
C. Mechanical energy
D. Thermal energy
Answer: Potential energy
If a machine has an efficiency of 80% and the useful output work is 400 J, what is the input work?
A. 500 J
B. 320 J
C. 400 J
D. 80 J
Answer: 500 J
Which of the following is an example of converting kinetic energy to potential energy?
A. A roller coaster climbing a hill
B. A pendulum swinging
C. A car accelerating on a straight road
D. A bicycle coasting downhill
Answer: A roller coaster climbing a hill
In a closed system, if the total mechanical energy is conserved, what is true about the kinetic and potential energy?
A. The sum of kinetic and potential energy remains constant
B. The sum of kinetic and potential energy decreases
C. The kinetic energy decreases while potential energy increases
D. The potential energy decreases while kinetic energy increases
Answer: The sum of kinetic and potential energy remains constant