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JEE PHYSICS MCQ: MECHANICAL PROPERTIES OF FLUIDS

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Application +4 | -1

A raindrop with radius

1.5mm

falls from a cloud at a height

1200\mathrm{m}

from ground. The density of water is

1000kg/{m^3}

and density of air is

1.2kg/{m^3}

. Assume the drop was spherical throughout the fall and there is no air drag. The impact speed of the drop will be

View answer and explanation

Correct option: B

550km/h

Option B (

550km/h

) is correct because it calculates the impact speed of the raindrop assuming no air drag, using the formula derived from conservation of energy.

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=10^{-2}

poise. A liquid rises to a height of 2 cm in a capillary tube. The angle of contact between the solid and the liquid is zero. The tube is depressed more so that the top of capillary tube is only one cm above the liquid. Then the apparent angle of contact between the solid and liquid is An object weights

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d_1

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m_2

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