Power and Energy NDA Questions

NDA Physics

Power and Energy MCQ Questions


13.
If a machine does 3000 J of work in 15 seconds, what is its power output?
A.
500 W
B.
450 W
C.
200 W
D.
300 W
😑 View Answer Rough Work Error
ANSWER :
C. 200 W
14.
What happens to the kinetic energy of an object in motion when its speed doubles?
A.
It remains the same
B.
It quadruples
C.
It doubles
D.
It triples
😑 View Answer Rough Work Error
ANSWER :
B. It quadruples
15.
A car accelerates from rest to 10 m/s in 5 seconds. What is its average power output?
A.
100 J/s
B.
100 W
C.
10 W
D.
1000 W
😑 View Answer Rough Work Error
ANSWER :
B. 100 W
16.
Which of the following is a source of energy used in a hydroelectric power plant?
A.
Nuclear fission
B.
Wind flow
C.
Water flow
D.
Coal combustion
😑 View Answer Rough Work Error
ANSWER :
C. Water flow
17.
A car engine has a power output of 500 W. How much work does it do in 10 seconds?
A.
5000 J
B.
2500 J
C.
50,000 J
D.
500 J
😑 View Answer Rough Work Error
ANSWER :
A. 5000 J
18.
Which of the following best describes the relationship between power and work done?
A.
Power is inversely proportional to time
B.
Power is directly proportional to work done
C.
Power is proportional to the square of work done
D.
Power is inversely proportional to work done
😑 View Answer Rough Work Error
ANSWER :
B. Power is directly proportional to work done