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

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IMPORTANT

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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:

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Important Questions on Surface Tension

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11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 13

A drop of liquid of diameter

2.8 mm

breaks up into

125

identical drops. The change in energy is nearly (S.T. of liquid

= 7.5 \times 10^{- 2} N m^{- 1}

) :

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ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 14

Two water drops coalesce into a larger drop. In this process:

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ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 15

A number of mercury droplets coalesce adiabatically to form a single drop. The temperature of the drop:

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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:

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ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 17

The soap bubbles have radii in the ratio

2 : 1

. The ratio of excess pressures inside them is:

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IMPORTANT

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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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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