Conservative and Non Conservative Forces NEET Questions

Physics - Work, Energy, and Power

Conservative and Non Conservative Forces MCQ Questions


13.
If both conservative and non-conservative forces are acting on a particle, the total work done is equal to the change in:

NEET - 2019

A.
Kinetic energy
B.
Potential energy
C.
Mechanical energy
D.
None of the above
😑 View Answer Rough Work Error
ANSWER :
C. Mechanical energy
14.
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 Rough Work Error
ANSWER :
C. Zero, since wall doesn't move (d = 0)
15.
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°
😑 View Answer Rough Work Error
ANSWER :
D. When angle between force and displacement is between 90° and 180°
16.
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 Rough Work Error
ANSWER :
D. −2000 J
17.
According to the work-energy theorem, the change in kinetic energy of a body is equal to the work done by:

NEET - 2020

A.
Non-conservative forces on the particle
B.
Conservative forces on the particle
C.
External forces on the particle
D.
All the forces on the particle
😑 View Answer Rough Work Error
ANSWER :
D. All the forces on the particle
18.
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
😑 View Answer Rough Work Error
ANSWER :
A. 0 J (road does not displace)