Physics MCQs

Physics

Rotational and Circular Motion


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#1

Angular displacement is measured in:

A) radian

B) degree per second

C) meter

D) newton

Answer:   A
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#2

Angular velocity is:

A) rate of change of angular displacement

B) rate of change of linear velocity

C) angular displacement per unit arc length

D) torque per unit time

Answer:   A
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#3

$\omega$ has SI unit:

A) $\text{rad s}^{-1}$

B) $\text{rad}$

C) $\text{m s}^{-1}$

D) $\text{s}$

Answer:   A
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#4

Angular acceleration is:

A) $\alpha=\dfrac{d\omega}{dt}$

B) $\alpha=\dfrac{d\theta}{dt}$

C) $\alpha=\dfrac{dv}{dt}$

D) $\alpha=\omega\theta$

Answer:   A
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#5

Relation between linear and angular velocity:

A) $v=r\omega$

B) $v=\dfrac{\omega}{r}$

C) $v=\omega r^{2}$

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

Answer:   A
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#6

Centripetal acceleration magnitude is:

A) $a_{c}=\dfrac{v^{2}}{r}=r\omega^{2}$

B) $a_{c}=vr$

C) $a_{c}=\dfrac{r}{v^{2}}$

D) $a_{c}=\omega/v$

Answer:   A
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#7

Centripetal force on a mass $m$ moving with speed $v$ in radius $r$:

A) $F=\dfrac{mv^{2}}{r}$

B) $F=\dfrac{mr^{2}}{v}$

C) $F=\dfrac{rv}{m}$

D) $F=\dfrac{m}{rv^{2}}$

Answer:   A
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#8

Torque of a force $\vec F$ about point with position $\vec r$:

A) $\vec\tau=\vec r\times\vec F$

B) $\vec\tau=\vec F\times\vec r$

C) $\tau=rF\cos\theta$

D) $\tau=F/r$

Answer:   A
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