Question: Joule–second is the unit of: [PMT/NEET-1990]
a. Work
b. Momentum
c. Pressure
d. Angular momentum

Answer: d. Angular momentum
Solution: Torque

$ \tau = \dfrac{dL}{dt} \Rightarrow L=\int \tau\,dt $.

Since

$[\tau]=\text{N m}=\text{J}$, $[L]=\text{J}\cdot \text{s}$.

Also

$L=r\times p$ has unit $\text{kg m}^2\text{s}^{-1}=\text{J s}$.