Why a spray pump dip in water is filled with liquid when the piston is pulled up

Force applied by piston on water sucks in the water

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Force applied by water on spray pump is more than pull force

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Pressure inside the spray pump reduces when the piston is pulled back forcing water into the cylinder

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Pressure inside the spray pump increases when the piston is pulled back forcing water into the cylinder

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Solution

The correct option is C Pressure inside the spray pump reduces when the piston is pulled back forcing water into the cylinder
When spray pump's piston is pulled up by external force, vacuum is created inside the cylinder causing a region of Low Pressure. Water outside is under influence of atmospheric pressure. Fluids from High Pressure to Low Pressure. Hence, water enters the cylinder of spray pump.

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