Question

Joule second is the unit of

• A. momentum
• B. angular momentum
• C. work
• D. pressure

Answer 1

Answer: (B)

Angular momentum of a body about an axis of rotation is given by
$J=I\omega$
where $I$ is moment of inertia, $\omega$ the angular velocity.
The SI unit of angular momentum is $kg{m}^2{s}^{-1}$ or Joule-second.
While momentum $p=mv$ has unit $kgm{s}^{-1}$, work has unit of Joule and pressure has unit dyne.