Work-Energy Theorem NEET Questions

Physics - Work, Energy, and Power

Work-Energy Theorem MCQ Questions


13.
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
14.
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)
15.
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
16.
A body of mass 5 kg is acted upon by a force F = (3î + 4ĵ) N. If the body is displaced from the point (1 m, 1 m) to the point (4 m, 5 m), the work done by the force is:

NEET - 2019

A.
25 J
B.
15 J
C.
20 J
D.
30 J
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ANSWER :
D. 30 J
17.
A cyclist stops in 10 m. Friction on cycle = 200 N, opposing motion. Work done by road on cycle is: [NCERT Ex 5.3]
A.
+2000 J
B.
0 J
C.
−2000 J
D.
+1000 J
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ANSWER :
C. −2000 J
18.
The work-energy theorem for a variable force F(x) is:
A.
Only valid for constant forces
B.
Kf − Ki = ∫F(x)dx from xᵢ to xf (integral form)
C.
Kf − Ki = F_avg × d
D.
Valid only in one dimension
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ANSWER :
B. Kf − Ki = ∫F(x)dx from xᵢ to xf (integral form)