Conservative and Non Conservative Forces NEET Questions

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

Conservative and Non Conservative Forces MCQ Questions


7.
A weightlifter holds a 150 kg mass stationary on his shoulder for 30 seconds. Work done by him on the load is:
A.
150 × 10 × 30 = 45000 J
B.
150 × 10 = 1500 J
C.
0 J (zero work)
D.
Cannot be determined
😑 View Answer Error
ANSWER :
C. 0 J (zero work)
8.
A block moves on a smooth horizontal table. Which force does ZERO work on the block?
A.
Applied horizontal force
B.
Gravitational force (mg)
C.
Both gravitational force and normal force
D.
None of the forces
😑 View Answer Error
ANSWER :
C. Both gravitational force and normal force
9.
A moon orbiting Earth in a perfectly circular orbit. Work done by Earth's gravitational force on the moon per orbit is:
A.
Equal to moon's kinetic energy
B.
Zero
C.
Equal to moon's potential energy
D.
Negative
😑 View Answer Error
ANSWER :
B. Zero
10.
A person pushes hard against a rigid brick wall. Work done by the person on the wall is:
A.
Positive, equal to force times time
B.
Very large, since large force is applied
C.
Zero, since wall doesn't move (d = 0)
D.
Negative, since person gets tired
😑 View Answer Error
ANSWER :
C. Zero, since wall doesn't move (d = 0)
11.
When is work done by a force NEGATIVE?
A.
When force is zero
B.
When displacement is zero
C.
When force and displacement are in the same direction
D.
When angle between force and displacement is between 90° and 180°
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ANSWER :
D. When angle between force and displacement is between 90° and 180°
12.
A cyclist comes to a skidding stop in 10 m. The stopping force (friction) on the cycle = 200 N. Work done by the road on the cycle is: [NCERT Ex 5.3]
A.
+2000 J
B.
0 J
C.
+1000 J
D.
−2000 J
😑 View Answer Error
ANSWER :
D. −2000 J
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