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JEE PHYSICS MCQ: MECHANICAL PROPERTIES OF FLUIDS

1 Hard

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Application +4 | -1

Eight identical drops of water, each of radius

2 \mathrm{~mm}

are falling through air at a terminal velocity of

8 \mathrm{~cm} \mathrm{~s}^{-1}.

If they coalesce to form a single drop, then the terminal velocity of combined drop will be:

View answer and explanation

Correct option: A

32 \mathrm{~cm} \mathrm{~s}^{-1}

Option A (

32 \mathrm{~cm} \mathrm{~s}^{-1}

) is correct because the terminal velocity is proportional to the square of the radius, and the radius doubles when eight drops coalesce.

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