Work-Energy Theorem NEET Questions

Physics - Work, Energy, and Power
Work-Energy Theorem

Work-Energy Theorem MCQ Questions


7.
A body of mass 2 kg moving at 6 m/s is brought to rest by a braking force in 4 m. The braking force is:
A.
3 N
B.
4 N
C.
6 N
D.
9 N
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ANSWER :
D. 9 N
8.
A 10 kg block is pushed 5 m along a horizontal surface by a force of 40 N (µₖ = 0.2, g = 10 m/s²). Change in KE of the block is:
A.
200 J
B.
100 J
C.
50 J
D.
150 J
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ANSWER :
B. 100 J
9.
A body of mass m moving at speed u is brought to rest by a constant retarding force F in distance s. The relation between these quantities is:
A.
Fs = mu
B.
Fs = ½mu²
C.
Fs = 2mu²
D.
F = mu/s
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ANSWER :
B. Fs = ½mu²
10.
A ball is projected vertically upward with speed u. At height h, its speed v satisfies (no air resistance):
A.
v² = u² + 2gh
B.
v² = u² − 2gh
C.
v² = u² + gh
D.
v = u − gt
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ANSWER :
B. v² = u² − 2gh
11.
A body falls freely from rest through height h. By the work-energy theorem, its speed at the bottom is:
A.
√(gh)
B.
√(2gh)
C.
√(3gh)
D.
2√(gh)
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ANSWER :
B. √(2gh)
12.
A raindrop (mass 1 g) falls from 1 km height and hits ground at 50 m/s. Work done by resistive force is: (g = 10 m/s²) [NCERT Ex 5.2]
A.
+8.75 J
B.
−8.75 J
C.
+10 J
D.
−10 J
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ANSWER :
B. −8.75 J
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