Conservative and Non Conservative Forces NEET Questions

Physics - Work, Energy, and Power
Conservative and Non Conservative Forces

Conservative and Non Conservative Forces MCQ Questions


13.
Work done by the cycle on the road in Q.12 is:
A.
0 J (road does not displace)
B.
+2000 J
C.
−2000 J
D.
−1000 J
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ANSWER :
A. 0 J (road does not displace)
14.
A body falls freely from height h. Work done by gravity on it is:
A.
Positive (+mgh)
B.
Zero (gravity is perpendicular to motion)
C.
Negative (gravity opposes fall)
D.
Depends on mass
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ANSWER :
A. Positive (+mgh)
15.
A block slides DOWN a rough inclined plane. Work done by friction is:
A.
Positive (friction acts downward like motion)
B.
Zero
C.
Negative (friction acts up the slope, opposing downward motion)
D.
Depends on angle of inclination
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ANSWER :
C. Negative (friction acts up the slope, opposing downward motion)
16.
A force F = (3î + 4ĵ − 5k̂) N acts on a body. Displacement d = (5î + 4ĵ + 3k̂) m. Work done is: [NCERT Ex 5.1]
A.
12 J
B.
16 J
C.
24 J
D.
0 J
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ANSWER :
B. 16 J
17.
A body constrained to move along the z-axis is subject to force F = (−î + 2ĵ + 3k̂) N. Work done in moving 4 m along z-axis is: [NCERT Ex 5.11]
A.
−4 J
B.
8 J
C.
20 J
D.
12 J
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ANSWER :
D. 12 J
18.
A force of 50 N acts at 60° to the displacement of 10 m. Work done is:
A.
500 J
B.
433 J
C.
288 J
D.
250 J
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ANSWER :
D. 250 J
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