Work, Energy, and Power MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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Which of the following types of energy is stored in food?
A. Thermal energy
B. Chemical energy
C. Mechanical energy
D. Kinetic energy
Answer: Chemical energy
The mechanical advantage of a machine is:
A. The ratio of output force to input force
B. The ratio of input force to output force
C. The energy efficiency of a machine
D. The power produced by the machine
Answer: The ratio of output force to input force
In which of the following processes is no work done?
A. Lifting a book
B. Pushing a wall
C. Moving a car
D. Falling from a height
Answer: Pushing a wall
The power output of a machine that does 1000 J of work in 10 seconds is:
A. 100 W
B. 1000 W
C. 10 W
D. 500 W
Answer: 100 W
The kinetic energy of an object increases when:
A. Its velocity increases
B. Its height increases
C. Its mass decreases
D. Its velocity decreases
Answer: Its velocity increases
The efficiency of a machine is:
A. The ratio of output work to input work
B. The ratio of input work to output work
C. The ratio of input energy to output energy
D. The energy used by the machine
Answer: The ratio of output work to input work
The power generated by lifting a 50 kg object vertically by 10 meters in 5 seconds is approximately:
A. 1000 W
B. 500 W
C. 100 W
D. 2000 W
Answer: 1000 W
The energy stored in a stretched rubber band is called:
A. Kinetic energy
B. Elastic potential energy
C. Thermal energy
D. Chemical energy
Answer: Elastic potential energy
When a car engine converts fuel into motion, the energy transformation involved is:
A. Chemical to mechanical
B. Thermal to electrical
C. Electrical to chemical
D. Mechanical to chemical
Answer: Chemical to mechanical