Work, Energy, and Power MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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The efficiency of a machine is a measure of:
A. The ratio of useful work done to total energy input
B. The power consumed
C. The total energy output
D. The distance moved
Answer: The ratio of useful work done to total energy input
The energy conversion in a hydroelectric power plant is:
A. Mechanical to electrical
B. Chemical to mechanical
C. Thermal to mechanical
D. Electrical to thermal
Answer: Mechanical to electrical
The formula for work done is:
A. W = F × d
B. W = mgh
C. W = 1/2 mv^2
D. W = P × t
Answer: W = F × d
The SI unit of energy is the:
A. Joule
B. Watt
C. Newton
D. Pascal
Answer: Joule
The power of a device is a measure of its:
A. Rate of energy transfer
B. Total energy used
C. Efficiency
D. Energy stored
Answer: Rate of energy transfer
The energy needed to start a car engine is provided by:
A. The car battery
B. The car's fuel
C. The alternator
D. The air intake
Answer: The car battery
The work done to stretch a spring is given by:
A. Hooke's Law
B. Newton's Law
C. Ohm's Law
D. Faraday's Law
Answer: Hooke's Law
The kinetic energy of a 5 kg object moving at 3 m/s is:
A. 22.5 J
B. 15 J
C. 30 J
D. 45 J
Answer: 22.5 J
Which of the following best describes work done?
A. Force applied over a distance
B. Energy converted to heat
C. Energy stored in a spring
D. Power used over time
Answer: Force applied over a distance