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  1. The velocity of falling rain drops attains a terminal value because of

    2. A.

     Surface tension
    B.

     Air current
    C.

     Upward thrust due to air
    D.

     Viscous force exerted by air

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    Answer : Option D

    Explanation :

    The velocity of falling rain drops attains a terminal value because of viscous force exerted by air.

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