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IMPORTANT

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A film of soap solution is trapped between a vertical frame and a light wire $a b$ of length $0.1 m$ . If $g = 10 {m s}^{- 2}$ , then the load $W$ that should be suspended from the wire to keep it in equilibrium is

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Important Questions on Surface Tension and Viscosity

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JEE Advanced

IMPORTANT

Physics For Joint Entrance Examination JEE (Advanced): Mechanics II>Chapter 8 - Surface Tension and Viscosity>Exercises>Q 22

The angle of contact between glass and water is

0 °

and water (surface tension

70 dyne {cm}^{- 1}

) rises in a glass capillary up to

6 cm

. Another liquid of surface tension,

140 dyne {cm}^{- 1}

, angle of contact

60 °

and relative density

2

will rise in the same capillary up to,

MEDIUM

JEE Advanced

IMPORTANT

Physics For Joint Entrance Examination JEE (Advanced): Mechanics II>Chapter 8 - Surface Tension and Viscosity>Exercises>Q 23

A hollow sphere has a small hole in it. On lowering the sphere in a tank of water, it is observed that water enters into the hollow sphere at a depth of

40 cm

below the surface. The surface tension of water is

7 \times 10^{- 2} N m^{- 1}

. The diameter of the hole is,

MEDIUM

JEE Advanced

IMPORTANT

Physics For Joint Entrance Examination JEE (Advanced): Mechanics II>Chapter 8 - Surface Tension and Viscosity>Exercises>Q 24

A capillary tube is attached horizontally to a constant pressure head arrangement. If the radius of the capillary tube is increased by

10 %

, then the rate of flow of the liquid shall change nearly by

MEDIUM

JEE Advanced

IMPORTANT

Physics For Joint Entrance Examination JEE (Advanced): Mechanics II>Chapter 8 - Surface Tension and Viscosity>Exercises>Q 25

A ball rises to the surface of a liquid with constant velocity. The density of the liquid is four-time the density of the material of the ball. The frictional force of the liquid on the rising ball is greater than the weight of the ball by a factor of,

MEDIUM

JEE Advanced

IMPORTANT

Physics For Joint Entrance Examination JEE (Advanced): Mechanics II>Chapter 8 - Surface Tension and Viscosity>Exercises>Q 26

A spherical ball falls through viscous medium with terminal velocity

v

. If this ball is replaced by another ball of the same mass but half the radius, then the terminal velocity will be (neglect the effect of buoyancy.)

MEDIUM

JEE Advanced

IMPORTANT

Physics For Joint Entrance Examination JEE (Advanced): Mechanics II>Chapter 8 - Surface Tension and Viscosity>Exercises>Q 27

Two parallel wires each of length

10 cm

are

0.5 cm

apart. A film of water is formed between them. If the surface tension of water is

0.072 N m^{- 1}

, then the work done in increasing the distance between the wires by

1 mm

EASY

JEE Advanced

IMPORTANT

Physics For Joint Entrance Examination JEE (Advanced): Mechanics II>Chapter 8 - Surface Tension and Viscosity>Exercises>Q 28

The length of a needle floating on water is

2.5 cm

. The minimum force in addition to its weight needed to lift the needle above the surface of the water will be (surface tension of water is

0.072 N m^{- 1}

)

MEDIUM

JEE Advanced

IMPORTANT

Physics For Joint Entrance Examination JEE (Advanced): Mechanics II>Chapter 8 - Surface Tension and Viscosity>Exercises>Q 29

A solid sphere falls with a terminal velocity of

20 {m s}^{- 1}

in the air. If it is allowed to fall in a vacuum,

A film of soap solution is trapped between a vertical frame and a light wire ab of length 0.1 m. If g=10 ms-2, then the load W that should be suspended from the wire to keep it in equilibrium is

Important Questions on Surface Tension and Viscosity

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A film of soap solution is trapped between a vertical frame and a light wire $a b$ of length $0.1 m$ . If $g = 10 {m s}^{- 2}$ , then the load $W$ that should be suspended from the wire to keep it in equilibrium is