Work Done by a Constant Force and a Variable Force NEET Questions

Physics - Work, Energy, and Power

Work Done by a Constant Force and a Variable Force MCQ Questions


1.
Which of the following is the correct definition of a conservative force?
A.
A force that always acts in the direction of motion
B.
A force for which work done depends only on the initial and final positions, not the path taken
C.
A force that conserves momentum
D.
A force that does zero work on any body
😑 View Answer Rough Work Error
ANSWER :
B. A force for which work done depends only on the initial and final positions, not the path taken
2.
Work done by a conservative force along a closed path is:
A.
Positive
B.
Negative
C.
Zero
D.
Depends on the speed of the body
😑 View Answer Rough Work Error
ANSWER :
C. Zero
3.
Which of the following forces is NON-CONSERVATIVE?
A.
Gravitational force
B.
Spring (elastic) force
C.
Frictional force
D.
Electrostatic force
😑 View Answer Rough Work Error
ANSWER :
C. Frictional force
4.

A force F (in newtons) acting on a particle moving in a straight line varies with distance d (in metres) according to F = 2d + 3. The work done by the force in displacing the particle from d = 0 to d = 12 m is:

A.

168 J

B.

192 J

C.

180 J

D.

156 J

😑 View Answer Rough Work Error
ANSWER :

C. 180 J

5.
For a conservative force F(x), the potential energy function V(x) is related by:
A.
F(x) = dV/dx
B.
F(x) = −dV/dx
C.
F(x) = V(x) · x
D.
F(x) = −V(x)/x
😑 View Answer Rough Work Error
ANSWER :
B. F(x) = −dV/dx
6.
A block is pushed along a rough horizontal surface from point A to point B by two different paths. The work done by friction:
A.
Is the same for both paths
B.
Is greater for the longer path
C.
Is zero for both paths
D.
Depends only on the endpoints A and B
😑 View Answer Rough Work Error
ANSWER :
B. Is greater for the longer path