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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,

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Important Questions on Surface Tension and Viscosity

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,

MEDIUM

JEE Advanced

IMPORTANT

Physics For Joint Entrance Examination JEE (Advanced): Mechanics II>Chapter 8 - Surface Tension and Viscosity>Exercises>Q 30

A marble of mass

x

and diameter

2 r

is gently released in a tall cylinder containing honey. If the marble displaces mass

y (< x)

of the liquid, then the terminal velocity is proportional to

MEDIUM

JEE Advanced

IMPORTANT

Physics For Joint Entrance Examination JEE (Advanced): Mechanics II>Chapter 8 - Surface Tension and Viscosity>Exercises>Q 31

Water rises to a height

h

in a capillary tube of cross-sectional area

A

. The height to which water will rise in a capillary tube of cross-sectional area

4 A

will be

MEDIUM

JEE Advanced

IMPORTANT

Physics For Joint Entrance Examination JEE (Advanced): Mechanics II>Chapter 8 - Surface Tension and Viscosity>Exercises>Q 32

Neglecting the density of air, the terminal velocity obtained by a raindrop of radius

0.3 mm

falling through the air of viscosity

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

will be

EASY

JEE Advanced

IMPORTANT

Physics For Joint Entrance Examination JEE (Advanced): Mechanics II>Chapter 8 - Surface Tension and Viscosity>Exercises>Q 33

Water rises to a height of $2 cm$ in a capillary tube. If the tube is tilted $60 °$ from the vertical, water will rise in the tube to a length

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,

Important Questions on Surface Tension and Viscosity

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