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

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

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Important Questions on Surface Tension

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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 20

Work done in increasing the size of a soap bubble from a radius of

3 cm

to

5 cm

is nearly (Surface tension of soap solution

= 0.03 N m^{- 1}

):

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ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 21

Two soap bubbles of radii

r_{1}

and

r_{2} (r_{1} > r_{2})

coalesce and become one. The radius

R

of the surface common to both the bubbles is :

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ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 22

A long glass cylinder has a small hole of radius

r

in its bottom. The depth to which it can be dipped vertically in the water of surface tension

T

and density

ρ

without any water entering the cylinder:

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ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 23

A vessel whose bottom has holes of diameter

0.1 mm

is filled with water (density

= 10^{3} kg m^{- 3}

, surface tension

7.5 \times 10^{- 2} {Nm}^{- 1}

). The maximum height up to which water can be filled without leakage is

(g = 10 m s^{- 2})

:

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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 :

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ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 25

A capillary tube is dipped vertically in a liquid. The meniscus of liquid in the capillary is in level with the liquid outside. The angle of contact is :

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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