An inverted tube barometer is kept in an accelerating lift inside which the pressure is same as the atmospheric pressure

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In the lift is accelerating upwards the level of mercury in the barometer will fall

If the lift is accelerating downwards the level of mercury in the barometer will rise

If the lift is accelerating upwards the level of mercury in the barometer will rise

The level of mercury in the barometer will rise irrespective of direction of acceleration

answer is A, B.

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Detailed Solution

If the lift is accelerating upwards weight of the mercury is more than buoyant force acting on it, then the level of mercury will fall. If the lift is accelerating downwards weight of the mercury less than buoyant force acting on it, then the level of mercury in the barometer will rise

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