Work, Energy, and Power MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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The work-energy principle states that:
A. Work done on an object equals the change in its kinetic energy
B. Work is equal to force times distance
C. Energy is conserved in an isolated system
D. Work is always equal to energy
Answer: Work done on an object equals the change in its kinetic energy
The gravitational potential energy of an object increases when:
A. Its height increases
B. Its mass decreases
C. Its velocity increases
D. Its temperature increases
Answer: Its height increases
In which type of energy transformation is thermal energy usually produced?
A. Mechanical to electrical
B. Chemical to mechanical
C. Electrical to thermal
D. All energy transformations
Answer: All energy transformations
A machine has an efficiency of 80%. If 1000 J of work is put into the machine, how much work is output?
A. 800 J
B. 200 J
C. 1000 J
D. 500 J
Answer: 800 J
Which of the following best describes kinetic energy?
A. Energy stored in an object
B. Energy due to motion
C. Energy resulting from a chemical reaction
D. Energy created from electrical current
Answer: Energy due to motion
The power output of a 60 W light bulb running for 5 hours is:
A. 300 Wh
B. 120 Wh
C. 60 Wh
D. 240 Wh
Answer: 300 Wh
Which of the following best describes potential energy?
A. Energy due to motion
B. Energy stored in an object
C. Energy transferred by heat
D. Energy used to move objects
Answer: Energy stored in an object
Power is a measure of:
A. The rate at which work is done
B. The amount of force exerted
C. The distance over which work is done
D. The energy required to do work
Answer: The rate at which work is done
If a force of 50 N is applied to move a box 3 meters, the work done is:
A. 150 J
B. 100 J
C. 50 J
D. 200 J
Answer: 150 J