_____ is involved in filling up the liquid into the syringe.

Gravitational force

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Magnetic force

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Electrostatic force

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Atmospheric pressure

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Solution

The correct option is D Atmospheric pressure
When the plunger of the syringe is pulled up in the barrel, the pressure inside the barrel is much less than atmospheric pressure. As a result atmospheric pressure forces the liquid to rise up in the syringe.

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Why does the liquid rise in a syringe when its piston is pulled up?

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0.5 {ms}^{- 1}

(g = 10 {ms}^{- 2})

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