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The energy transformation in a battery-operated clock is from:
A. Chemical to Mechanical
B. Mechanical to Electrical
C. Electrical to Mechanical
D. Chemical to Electrical
Answer: Chemical to Electrical
Which of the following is an example of energy conversion from potential to kinetic energy?
A. A ball rolling down a ramp
B. A car speeding up on a straight road
C. A book on a shelf
D. A spinning top
Answer: A ball rolling down a ramp
If the work done on an object is 100 J and the time taken is 20 seconds, what is the power output?
A. 5 W
B. 10 W
C. 20 W
D. 50 W
Answer: 5 W
What is the kinetic energy of an object with a mass of 2 kg moving at a speed of 3 m/s?
A. 9 J
B. 18 J
C. 12 J
D. 6 J
Answer: 9 J
The efficiency of a machine is given by the ratio of:
A. Useful work output to total work input
B. Total work input to useful work output
C. Useful work output to mechanical advantage
D. Work input to work done
Answer: Useful work output to total work input
What is the work done to lift a 5 kg object to a height of 8 meters? (Take g = 9.8 m/s²)
A. 392 J
B. 490 J
C. 400 J
D. 100 J
Answer: 392 J
The energy possessed by a stationary object due to its position is called:
A. Potential energy
B. Kinetic energy
C. Mechanical energy
D. Thermal energy
Answer: Potential energy
If a machine has an efficiency of 80% and the useful output work is 400 J, what is the input work?
A. 500 J
B. 320 J
C. 400 J
D. 80 J
Answer: 500 J
Which of the following is an example of converting kinetic energy to potential energy?
A. A roller coaster climbing a hill
B. A pendulum swinging
C. A car accelerating on a straight road
D. A bicycle coasting downhill
Answer: A roller coaster climbing a hill