Work, Energy, and Power MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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The energy conversion in an electric fan involves converting:
A. Electrical energy to mechanical energy
B. Mechanical energy to electrical energy
C. Thermal energy to electrical energy
D. Chemical energy to electrical energy
Answer: Electrical energy to mechanical energy
The energy required to heat water is an example of:
A. Thermal energy
B. Kinetic energy
C. Potential energy
D. Mechanical energy
Answer: Thermal energy
The energy stored in a stretched spring is an example of:
A. Elastic potential energy
B. Kinetic energy
C. Gravitational potential energy
D. Thermal energy
Answer: Elastic potential energy
The formula for calculating kinetic energy is:
A. KE = 1/2 mv^2
B. KE = mgh
C. KE = F × d
D. KE = 1/2 kx^2
Answer: KE = 1/2 mv^2
The energy conversion in a battery-operated flashlight involves converting:
A. Chemical energy to electrical and then to light
B. Mechanical energy to electrical and then to light
C. Electrical energy to chemical and then to light
D. Chemical energy to thermal and then to light
Answer: Chemical energy to electrical and then to light
The work done to lift an object is equal to its:
A. Change in potential energy
B. Change in kinetic energy
C. Change in thermal energy
D. Change in chemical energy
Answer: Change in potential energy
The energy of a moving object is an example of:
A. Kinetic energy
B. Potential energy
C. Thermal energy
D. Chemical energy
Answer: Kinetic energy
The total mechanical energy of an object is conserved if:
A. No external forces are acting on it
B. It is moving in a circle
C. It is losing heat
D. It is gaining speed
Answer: No external forces are acting on it
The energy required to start a vehicle engine is provided by:
A. The car battery
B. The fuel
C. The alternator
D. The air intake
Answer: The car battery