Power NEET Questions

Physics - Work, Energy, and Power
Power

Power MCQ Questions


13.
A vehicle of mass 1000 kg accelerates from rest to 20 m/s in 10 s. Average power delivered by engine (ignore friction) is:
A.
10000 W
B.
20000 W
C.
40000 W
D.
2000 W
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ANSWER :
B. 20000 W
14.
An elevator (max load 1800 kg) moves upward at constant 2 m/s, friction = 4000 N. Minimum motor power is: (g = 10 m/s²) [NCERT Ex 5.10]
A.
18000 W
B.
36000 W
C.
44000 W
D.
8000 W
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ANSWER :
C. 44000 W
15.
A pump on ground floor fills a tank (volume 30 m³) 40 m above ground in 15 min. Pump efficiency = 30%. Electric power consumed is: (g = 10 m/s², ρ_water = 1000 kg/m³) [NCERT Ex 5.15]
A.
4.44 kW
B.
13.3 kW
C.
44.4 kW
D.
133 kW
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ANSWER :
C. 44.4 kW
16.
A car moves at constant velocity 20 m/s. Engine force = 500 N. Power of engine is:
A.
25 W
B.
10000 W
C.
500 W
D.
100 W
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ANSWER :
B. 10000 W
17.
A car engine delivers constant power P. The car encounters resistance force f. Maximum speed v_max is:
A.
v_max = f/P
B.
v_max = P/f
C.
v_max = Pf
D.
v_max = √(P/f)
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ANSWER :
B. v_max = P/f
18.
A vehicle (resistance 500 N) engine delivers 25 kW. Maximum speed is:
A.
12.5 m/s
B.
50 m/s
C.
125 m/s
D.
0.02 m/s
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ANSWER :
B. 50 m/s
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