Moment of a Force NEET Questions

Physics - Rotational Motion

Moment of a Force MCQ Questions


1.
The turning effect of a force about a fixed axis is called:
A.
Linear momentum
B.
Impulse
C.
Torque
D.
Power
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ANSWER :
C. Torque
2.
The SI unit of moment of force (torque) is:
A.
N·s
B.
kg·m/s²
C.
N·m
D.
J/s
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ANSWER :
C. N·m
3.
The dimensional formula of moment of a force is:
A.
[M L T⁻²]
B.
[M L² T⁻¹]
C.
[M L² T⁻²]
D.
[M L⁻¹ T⁻²]
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ANSWER :
C. [M L² T⁻²]
4.
Torque is a:
A.
Scalar quantity
B.
Vector quantity
C.
Dimensionless quantity
D.
Tensor of rank 0
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ANSWER :
B. Vector quantity
5.
The direction of the torque vector τ = r × F is:
A.
Along r
B.
Along F
C.
Perpendicular to the plane containing r and F
D.
Opposite to r
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ANSWER :
C. Perpendicular to the plane containing r and F
6.
Moment of a force vanishes (τ = 0) when:
A.
Force is maximum
B.
Line of action of the force passes through the axis of rotation
C.
Force is perpendicular to r
D.
Force acts at 45° to r
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ANSWER :
B. Line of action of the force passes through the axis of rotation