Q

Which substance can have a higher optical density but a lower mass density?

RRB NTPC (10+2 level) (Stage-I) 18/08/2025 / Shift-II 2025
✓ Answer: B Turpentine oil
Optical density depends on the speed of light, while mass density is mass per unit volume. Turpentine oil illustrates that these quantities need not increase together.
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