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 sub-hemispherical soap bubble as shown in figure. Just after opening the valve,

air from end 1 flows towards end 2 . Volume of the soap bubble at end 1 decreases.

air from end 1 flows towards end 2 . There is no change in the volume of the soap bubbles.

air from end 2 flows towards end 1 . Volume of the soap bubble at end 1 increases.

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A ring having radius $2.5 cm$ and mass $10 gram$ floats on a liquid surface having surface tension $0.06 N m^{- 1}$ . Find the force required to just lift the ring from liquid surface.

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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 (Analytical Questions)>Q 5

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.

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End $1$ has a hemispherical soap bubble of radius $r$ . End $2$ has sub-hemispherical soap bubble as shown in figure. Just after opening the valve,

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Beta Question Bank for Medical: Physics>Chapter 14 - Viscosity and Surface Tension>Exercise (Analytical Questions)>Q 6

When a large bubble rises from the bottom of a lake to the surface, its radius doubles. If atmospheric pressure is equal to that of column of water height H, then the depth of lake is

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Beta Question Bank for Medical: Physics>Chapter 14 - Viscosity and Surface Tension>Exercise (Analytical Questions)>Q 8

If the difference between pressure inside and outside a soap bubble is

6 mm

of water and its radius is

8 mm

, what is the surface tension in

dynes per cm

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Beta Question Bank for Medical: Physics>Chapter 14 - Viscosity and Surface Tension>Exercise (Analytical Questions)>Q 9

An air bubble is lying just below the surface of water. The surface tension of water is

70 \times 10^{- 3} N m^{- 1}

and atmospheric pressure is

1.013 \times 10^{5} N m^{- 2}

. If the radius of bubble is

1 mm

, then the pressure inside the bubble will be,

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Beta Question Bank for Medical: Physics>Chapter 14 - Viscosity and Surface Tension>Exercise (Analytical Questions)>Q 10

Which one of the following will make its way most easily through the tiny space between the fibre of the clothing?

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Beta Question Bank for Medical: Physics>Chapter 14 - Viscosity and Surface Tension>Exercise (Analytical Questions)>Q 11

The diameters of two limbs of a U-tube are

2 mm

and

5 mm

and surface tension is

70 dyne {cm}^{- 1}

. If the density of water is

1000 kg m^{- 3}

and

g = 10 m s^{- 2}

, then water level difference in both the tubes will be,

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Beta Question Bank for Medical: Physics>Chapter 14 - Viscosity and Surface Tension>Exercise (Assertion & Reason)>Q 1

A capillary tube of radius

r

is immersed in water and water rises in it to a height

h

. The mass of water in the capillary tube is

5 g

. Another capillary tube of radius

2 r

is immersed in water. The mass of water that will rise in this tube is,

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Beta Question Bank for Medical: Physics>Chapter 14 - Viscosity and Surface Tension>Exercise (Assertion & Reason)>Q 2

Assertion: A needle placed carefully on the surface of water may float whereas a ball of the same material will always sink.

Reason: The buoyancy of an object depends both on the materials and shape of the object.

A ring having radius 2.5 cm and mass 10 gram floats on a liquid surface having surface tension 0.06 N m-1. Find the force required to just lift the ring from liquid surface.

Important Questions on Viscosity and Surface Tension

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A ring having radius $2.5 cm$ and mass $10 gram$ floats on a liquid surface having surface tension $0.06 N m^{- 1}$ . Find the force required to just lift the ring from liquid surface.