Beta Question Bank for Medical: Physics>Chapter 14 - Viscosity and Surface Tension>Exercise (Conceptual Questions)>Q 15

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The excess pressure inside an air bubble of radius $r$ just below the surface of the water is $p_{1}$ . The excess pressure inside a drop of the same radius just outside the surface is $p_{2}$ . If $T$ is surface tension, then

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Important Questions on Viscosity and Surface Tension

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Beta Question Bank for Medical: Physics>Chapter 14 - Viscosity and Surface Tension>Exercise (Conceptual Questions)>Q 16

A water drop is divided into

8

equal droplets. The pressure difference between the inner and outer sides of the big drop

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Beta Question Bank for Medical: Physics>Chapter 14 - Viscosity and Surface Tension>Exercise (Conceptual Questions)>Q 17

A false statement is:

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Beta Question Bank for Medical: Physics>Chapter 14 - Viscosity and Surface Tension>Exercise (Conceptual Questions)>Q 18

If a capillary of the radius

r

is dipped in water, the height of water that rises in it is

h

and its mass is

M

. If the radius of the capillary is doubled the mass of water that rises in the capillary will be:

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Beta Question Bank for Medical: Physics>Chapter 14 - Viscosity and Surface Tension>Exercise (Conceptual Questions)>Q 19

On dipping a capillary of radius

r

in water, the water rises up to a height

H

and the potential energy of water is

u_{1}

. If a capillary of the radius

2 r

is dipped in water, then the potential energy is

u_{2}

. The ratio

\frac{u_{1}}{u_{2}}

is:

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Beta Question Bank for Medical: Physics>Chapter 14 - Viscosity and Surface Tension>Exercise (Conceptual Questions)>Q 20

A vessel, whose bottom has round holes with diameter of

0.1 mm

, is filled with water. The maximum height to which the water can be filled without leakage is (surface tension of water,

T = 75 dyne {cm}^{- 1}

,

g = 1000 cm s^{- 2}

)

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Beta Question Bank for Medical: Physics>Chapter 14 - Viscosity and Surface Tension>Exercise (Conceptual Questions)>Q 21

In a surface tension experiment with a capillary tube water rises up to

0.1 m

. If the same experiment is repeated on an artificial satellite, which is revolving around the earth, water will rise in the capillary tube up to a height of

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Beta Question Bank for Medical: Physics>Chapter 14 - Viscosity and Surface Tension>Exercise (Conceptual Questions)>Q 22

A soap bubble in vacuum has a radius of

3 cm

and another soap bubble in vacuum has a radius of

4 cm

.
If the two bubbles coalesce under isothermal condition, then the radius of the new bubble is

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Beta Question Bank for Medical: Physics>Chapter 14 - Viscosity and Surface Tension>Exercise (Conceptual Questions)>Q 23

The spherical shape of raindrops is due to _____.