Suppose the pressure at the surface of mercury in a barometer tube is $P_{1}$ and the pressure at the surface of mercury in the cup is $P_{2}$ .

P_{1} = 0, P_{2} =

atmospheric pressure

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P_{1} =

atmospheric pressure,

P_{2} = 0

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P_{1} = P_{2} =

atmospheric pressure

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P_{1} = P_{2} = 0

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Solution

The correct option is A $P_{1} = 0, P_{2} =$ atmospheric pressure
In barometer there is nothing above the surface of mercury , so the pressure $P_{1}$ is zero.
But on the surface of mercury in the cup have atmosphere above it. Therefore $P_{2}$ is atmospheric pressure.
Hence option A is correct.

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Similar questions

Q. Suppose the pressure at the surface of mercury in a barometer tube is P₁ and the pressure at the surface of mercury in the cup is P₂.
(a) P₁ = 0, P₂ = atmospheric pressure
(b) P₁ = atmospheric pressure P₂ = 0
(c) P₁ = P₂ = atmospheric pressure
(d) P₁ = P₂ = 0

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Suppose the pressure at the surface of mercury in a barometer tube is P1 and the pressure at the surface of mercury in the cup is P2.

The correct option is A P1=0,P2= atmospheric pressureIn barometer there is nothing above the surface of mercury , so the pressure P1 is zero.But on the surface of mercury in the cup have atmosphere above it. Therefore P2 is atmospheric pressure.Hence option A is correct.

Suppose the pressure at the surface of mercury in a barometer tube is $P_{1}$ and the pressure at the surface of mercury in the cup is $P_{2}$ .

The correct option is A $P_{1} = 0, P_{2} =$ atmospheric pressure
In barometer there is nothing above the surface of mercury , so the pressure $P_{1}$ is zero.
But on the surface of mercury in the cup have atmosphere above it. Therefore $P_{2}$ is atmospheric pressure.
Hence option A is correct.