The graph between two quantities $P$ and $Q$ is a straight line passing through the origin when:
- A$P Q = \text{constant}$
- B$\frac{P}{Q} = \text{constant}$
- C$P Q^2 = \text{constant}$
- D$\frac{P}{Q^2} = \text{constant}$
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Match the physical quantities in Column-$I$ with those in Column-$II$ having the same dimensions. The correct matching is:
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| $A$. Entropy | $I$. Angular velocity |
| $B$. Young's modulus of elasticity | $II$. Boltzmann constant |
| $C$. Angular momentum | $III$. Energy density |
| $D$. Decay constant | $IV$. Planck's constant |
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