A 20 cm long capillary tube is dipped in water. The water rises up to 8 cm. If the entire arrangement is put in a freely falling elevator, the length of water column in the capillary tube will be

1. 8 cm

2. 6 cm

3. 10 cm

4. 20 cm

Subtopic:  Capillary Rise |
 67%
From NCERT
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Viscosity is a property of:
1. liquids only
2. solids only
3. solids and liquids only
4. liquids and gases only

Subtopic:  Viscosity |
 73%
From NCERT
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The force of viscosity is

1. electromagnetic

2. gravitational

3. nuclear

4. weak

Subtopic:  Viscosity |
From NCERT
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The viscous force acting between two layers of a liquid is given by \(\frac FA=-\eta\frac{dv}{dz}\). This F/A may be called

1. pressure

2. longitudinal stress

3. tangential stress

4. volume stress

Subtopic:  Viscosity |
 60%
From NCERT
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A raindrop falls near the surface of the earth with almost uniform velocity because

1. its weight is negligible

2. the force of surface tension balances its weight

3. the force of viscosity of air balances its weight

4. the drops are charged and atmospheric electric field balances its weight

Subtopic:  Viscosity |
 76%
From NCERT
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A piece of wood is taken deep inside a long column of water and released. It will move up

1. with a constant upward acceleration

2. with a decreasing upward acceleration

3. with a deceleration

4. with a uniform velocity

Subtopic:  Viscosity |
 52%
From NCERT
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A solid sphere falls with a terminal velocity of 20 m s–1 in air. If it is allowed to fall in vacuum,

1. terminal velocity will be 20 m s–1

2. terminal velocity will be less than 20 m s–1

3. terminal velocity will be more than 20 m s–1

4. there will be no terminal velocity

Subtopic:  Viscosity |
 64%
From NCERT
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A spherical ball is dropped in a long column of a viscous liquid. The speed of the ball (\(v\)) as a function of time (\(t\)) may be best represented by the graph:

                                   
1. \(\mathrm{D}\) 
2. \(\mathrm{B}\) 
3. \(\mathrm{A}\) 
4. \(\mathrm{C}\)

Subtopic:  Viscosity |
 71%
From NCERT
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The properties of a surface are different from those of the bulk liquid because the surface molecules

(a) are smaller than other molecules
(b) acquire charge due to collision from air molecules
(c) find different types of molecules in their range of influence
(d) feel a net force in one direction

Choose the correct option:
1. (a) and (b) 2. (b) and (c)
3. (c) and (d) 4. All of these
Subtopic:  Properties of Fluids |
 63%
From NCERT
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The rise of a liquid in a capillary tube depends on

(a) the material

(b) the length

(c) the outer radius

(d) the inner radius of the tube

Choose the correct option:

1. (a) and (b)

2. (a), (b) and (c)

3. (a), (b) and (d)

4. All of these

Subtopic:  Capillary Rise |
 59%
From NCERT
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