Moment of a Force NEET Questions

Physics - Rotational Motion

Moment of a Force MCQ Questions


7.
A force of 5 N acts perpendicularly at the end of a 2 m long rod pivoted at one end. What is the torque?
A.
5 N路m
B.
10 N路m
C.
2.5 N路m
D.
20 N路m
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ANSWER :
B. 10 N路m
8.
A wheel of radius R is rotating with angular velocity 蠅. If a force F is applied at the edge, what is the resulting torque?
A.
FR
B.
2FR
C.
FR/2
D.
F/R
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ANSWER :
A. FR
9.
A seesaw is balanced with a child of mass m sitting at a distance d from the pivot. What happens if the child moves closer?
A.
Torque increases
B.
Torque decreases
C.
Torque remains same
D.
Seesaw becomes unstable
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ANSWER :
B. Torque decreases
10.
A thin rod is pivoted at one end. If the rod is in equilibrium, what must be true about the sum of torques?
A.
Nonzero
B.
Maximum
C.
Zero
D.
Minimum
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ANSWER :
C. Zero
11.
The torque on a particle moving in a circular path with constant speed is
A.
Zero
B.
Maximum
C.
Constant
D.
Varies with time
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ANSWER :
A. Zero
12.
A rod of length 2m is pivoted at one end. If a force of 10N is applied at the free end at an angle of 90掳 to the rod, the torque about the pivot is
A.
10 N路m
B.
20 N路m
C.
5 N路m
D.
0 N路m
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ANSWER :
B. 20 N路m