MCQ
A vessel $A$ baa volume $V$ and a vessel $B$ has volume $2 V$ . Both contain some water which has a constant volume. The pressure in the space above water is $\mathrm{p}_{\mathrm{a}}$ for veesel $A$ and $\mathrm{p}_{\mathrm{b}}$ for vessel $B$.
  • $\mathrm{p}_{\mathrm{a}}=\mathrm{p}_{\mathrm{b}}$
  • B
    $\mathrm{p}_{\mathrm{a}}=2 \mathrm{p}_{\mathrm{b}}$
  • C
    $\mathrm{p}_{\mathrm{b}}=2 \mathrm{p}_{\mathrm{a}}$
  • D
    $\mathrm{p}_{\mathrm{b}}=4 \mathrm{p}_{\mathrm{a}}$

Answer

Correct option: A.
$\mathrm{p}_{\mathrm{a}}=\mathrm{p}_{\mathrm{b}}$
The maximum pressure attainable above the water will be saturated vapour pressure at that temperature. Since saturated vapour pressure does not depend upon volume, both the vessels will have same pressure.

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