In cities water supply from an overhead tank to.the houses is done due to:

difference in pressure

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gravitational force

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decrease of friction in pipes

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flow of liquid

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Solution

The correct option is C gravitational force
The water in an overhead tank has higher gravitational potential to compared to water which finally flows out of the taps in the houses.
The water moves due to this decrease in gravitational potential energy of water by flowing out of taps, or, the water is supplied by the gravitational force acting on water.

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