Moment of a Force NEET Questions

Physics - Rotational Motion

Moment of a Force MCQ Questions


1.
A uniform rod of length L and mass M is pivoted at one end and held horizontal. What is the initial angular acceleration when it is released?
A.
3g/2L
B.
g/L
C.
2g/3L
D.
g/2L
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ANSWER :
A. 3g/2L
2.
A force F is applied tangentially to a uniform circular disc of mass M and radius R, causing pure rolling motion. What is the torque about the center?
A.
FR
B.
2FR
C.
3FR/2
D.
FR/2
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ANSWER :
A. FR
3.
A meter scale is pivoted at its center. A force of 2 N is applied at the 25 cm mark, perpendicular to the scale. What is the torque about the pivot?
A.
0.25 N路m
B.
0.5 N路m
C.
1 N路m
D.
2 N路m
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ANSWER :
B. 0.5 N路m
4.
A door is pushed with force F at a distance x from its hinges. If the force is doubled and applied at x/2, how does the torque change?
A.
Increases
B.
Decreases
C.
Remains same
D.
Becomes zero
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ANSWER :
C. Remains same
5.
A uniform circular disc of mass M and radius R is rotating about a fixed axis with angular velocity 蠅. The moment of inertia about the axis is I. What is the torque required to bring it to rest in time t?
A.
I蠅/t
B.
I蠅/2t
C.
2I蠅/t
D.
I蠅虏/2t
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ANSWER :
A. I蠅/t
6.
A uniform beam of length L is hinged at one end and held horizontally. What is the moment of force due to its weight about the hinge?
A.
MgL/4
B.
MgL/2
C.
MgL/3
D.
MgL
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ANSWER :
B. MgL/2