Physics MCQs

Physics

Rotational and Circular Motion


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#41

Unit of angular momentum:

A) $\text{kg m}^{2}\text{s}^{-1}$

B) $\text{kg m s}^{-1}$

C) $\text{N m}$

D) $\text{J}$

Answer:   A
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#42

S.I. unit of moment of inertia:

A) $\text{kg m}^{2}$

B) $\text{kg m}$

C) $\text{kg m}^{-2}$

D) $\text{kg s}^{2}$

Answer:   A
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#43

Dimension of torque is same as:

A) work/energy

B) power

C) momentum

D) pressure

Answer:   A
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#44

But torque is different from work because:

A) it is an axial (pseudovector)

B) it has different unit

C) it is scalar

D) it is dimensionless

Answer:   A
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#45

Angular impulse equals change in:

A) angular momentum

B) kinetic energy

C) torque

D) moment of inertia

Answer:   A
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#46

$\omega$–$\alpha$ relation in constant angular acceleration:

A) $\omega^{2}=\omega_{0}^{2}+2\alpha\theta$

B) $\omega=\omega_{0}+\alpha\theta$

C) $\omega^{2}=\omega_{0}\alpha\theta$

D) $\omega=\alpha/\theta$

Answer:   A
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#47

Rotational kinematic equation:

A) $\theta=\omega_{0}t+\tfrac12\alpha t^{2}$

B) $\theta=\omega t^{2}$

C) $\theta=\tfrac12\omega t$

D) $\theta=\alpha/t$

Answer:   A
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#48

Tangential speed of a point on rim:

A) $v=\omega R$

B) $v=\alpha R$

C) $v=\dfrac{R}{\omega}$

D) $v=\dfrac{\omega}{R}$

Answer:   A
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