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___________ is useful in determining gradient of water underground.

(a) Pressure meter

(b) Penetrometer

(c) Piezometer

(d) Hydrometer

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The correct option is (c) Piezometer

To explain I would say: Piezometer is used for long term investigation of ground water tables in cut and fill areas. They are also used to determine if there is upward or downward gradient of water.

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