Moment of a Force NEET Questions

Physics - Rotational Motion

Moment of a Force MCQ Questions


7.
The magnitude of moment of a force F acting at a point whose position vector is r, where θ is the angle between r and F, is:
A.
rF cosθ
B.
rF tanθ
C.
rF sinθ
D.
rF
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ANSWER :
C. rF sinθ
8.
A door is most easily opened when force is applied:
A.
Near the hinges, perpendicular to the door
B.
At the middle of the door, parallel to the door
C.
At the outer edge, parallel to the door
D.
At the outer edge, perpendicular to the door
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ANSWER :
D. At the outer edge, perpendicular to the door
9.
Torque is the rotational analogue of:
A.
Mass
B.
Velocity
C.
Force
D.
Momentum
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ANSWER :
C. Force
10.
If r⊥ is the perpendicular distance of the line of action of force F from the axis, the moment of force is:
A.
F / r⊥
B.
r⊥² F
C.
r⊥ + F
D.
r⊥ × F (magnitude r⊥ F)
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ANSWER :
D. r⊥ × F (magnitude r⊥ F)
11.
A force of 10 N acts at a point whose position vector from the origin has a magnitude of 0.5 m, perpendicular to the force. The torque about the origin is:
A.
2 N·m
B.
5 N·m
C.
10 N·m
D.
0.5 N·m
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ANSWER :
B. 5 N·m
12.
A force F = 5 N is applied at a perpendicular distance of 0.4 m from a pivot. The moment of force about the pivot is:
A.
0.08 N·m
B.
20 N·m
C.
2 N·m
D.
12.5 N·m
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ANSWER :
C. 2 N·m