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Assume that a drop of liquid evaporates by decrease in its surface energy, so that its temperature remains unchanged. What should be the minimum radius of the drop for this to be possible? The surface tension is $T$ , density of liquid is $ρ$ and $L$ is its latent heat of vaporization.

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Important Questions on Surface Tension

HARD

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 12

A certain number of spherical drops of a liquid of radius

r

coalesce to form a single drop of radius

R

and volume

V

. If

T

is the surface tension of the liquid then:

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 16

The excess pressure inside a spherical drop is

6

units. If

8

such drops coalesce, the excess pressure inside the new drop will be:

HARD

11th ICSE

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ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 18

If two soap-bubbles of different radii are connected by a tube then :

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11th ICSE

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ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 19

A glass tube of uniform internal radius $(r)$ ) has a valve separating the two identical ends. Initially, the valve is in a tightly closed position. End- $1$ has a hemispherical soap bubble of radius $r$ . End- $2$ has a sub-hemispherical soap bubble as shown in the figure. Just after opening the valve.

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ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 24

Due to capillary action, a liquid will rise in a narrow tube if the angle of contact is :

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 26

Water rises in a capillary tube to a height of

4 cm

. If the area of cross-section of the tube is reduced to one-fourth, then up to what height will the water rise?

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11th ICSE

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ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 27

Water rises in a capillary tube of radius

r

up to a height

h

. The mass of water in the capillary tube is

m

. The mass of water that will rise in a capillary tube of radius

2 r

will be:

HARD

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 29

A glass capillary tube is of the shape of a truncated cone with an apex angle

α

so that its two ends have cross-sections of different radii. When dipped in water vertically, water rises in it to a height

h

, where the radius of its cross-section is

b

. If the surface tension of water is

T

, its density is

ρ

, and its contact angle with glass is

0

, the value of

h

will be : (

g

is the acceleration due to gravity)

Assume that a drop of liquid evaporates by decrease in its surface energy, so that its temperature remains unchanged. What should be the minimum radius of the drop for this to be possible? The surface tension is T, density of liquid is ρ and L is its latent heat of vaporization.

Important Questions on Surface Tension

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Assume that a drop of liquid evaporates by decrease in its surface energy, so that its temperature remains unchanged. What should be the minimum radius of the drop for this to be possible? The surface tension is $T$ , density of liquid is $ρ$ and $L$ is its latent heat of vaporization.