Work, Energy, and Power MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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Which of the following is not a type of mechanical energy?
A. Kinetic energy
B. Potential energy
C. Thermal energy
D. Elastic energy
Answer: Thermal energy
The total energy in a closed system:
A. Always remains constant
B. Can be increased by doing work
C. Can be lost as heat
D. Always decreases over time
Answer: Always remains constant
The energy of an object at rest is called:
A. Kinetic energy
B. Potential energy
C. Thermal energy
D. Elastic energy
Answer: Potential energy
A weightlifter lifting a barbell over his head does work because:
A. A force is applied over a distance
B. Energy is being used
C. His arms are in motion
D. He is exerting force
Answer: A force is applied over a distance
Which of the following is an example of the conversion of potential energy to kinetic energy?
A. A roller coaster descending a hill
B. A car moving at a constant speed
C. A burning candle
D. A lightbulb being turned on
Answer: A roller coaster descending a hill
When a moving car comes to a stop, the kinetic energy is converted into:
A. Potential energy
B. Heat energy
C. Electrical energy
D. Chemical energy
Answer: Heat energy
The work done by a machine that exerts a force of 200 N over a distance of 4 meters is:
A. 800 J
B. 400 J
C. 200 J
D. 1000 J
Answer: 800 J
The unit of power in the International System (SI) is:
A. Joule
B. Newton
C. Watt
D. Pascal
Answer: Watt
The law of conservation of energy states that:
A. Energy cannot be created or destroyed
B. Energy is always increasing
C. Energy is constant when work is done
D. Energy can only be transferred as heat
Answer: Energy cannot be created or destroyed