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The power of an engine is a measure of its:
A. Rate of doing work
B. Total energy output
C. Fuel efficiency
D. Force exerted
Answer: Rate of doing work
The total mechanical energy of an object is the sum of its:
A. Kinetic and potential energy
B. Kinetic and thermal energy
C. Potential and chemical energy
D. Thermal and chemical energy
Answer: Kinetic and potential energy
Which energy transformation occurs in a battery-powered flashlight?
A. Chemical to electrical to light
B. Mechanical to electrical to light
C. Electrical to chemical to light
D. Chemical to light
Answer: Chemical to electrical to light
The change in kinetic energy of an object is equal to the:
A. Work done on the object
B. Change in potential energy
C. Change in thermal energy
D. Change in gravitational energy
Answer: Work done on the object
The energy required to lift a 10 kg object to a height of 2 meters is:
A. 200 J
B. 20 J
C. 100 J
D. 50 J
Answer: 200 J
The energy conversion in a light bulb is primarily from:
A. Electrical to light and heat
B. Chemical to light
C. Mechanical to electrical
D. Electrical to mechanical
Answer: Electrical to light and heat
If a machine does 500 J of work in 25 seconds, its power is:
A. 20 W
B. 50 W
C. 500 W
D. 1000 W
Answer: 20 W
Which of the following is an example of elastic potential energy?
A. A compressed spring
B. A car moving
C. A book on a shelf
D. A battery
Answer: A compressed spring
The unit of work and energy in the International System of Units (SI) is:
A. Joule
B. Newton
C. Watt
D. Pascal
Answer: Joule