If a soap bubble of radius 3 cm coalesce with another soap bubble of radius 4 cm under isothermal conditions, the radius of the resultant bubble formed is in cm-

1. 7

2. 1

3. 5

4. 12

Concept Questions :-

Surface tension
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Difficulty Level:

1.  5:3:7

2.  7:3:5

3.  21:35:15

4.  1:1:1

Concept Questions :-

Equation of continuity
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Difficulty Level:

W is the work done in forming a bubble of radius r, the work is done in forming a bubble of radius 2r will be:-

1.  4W

2.  3W

3.  2W

4.  W

Concept Questions :-

Surface tension
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Difficulty Level:

Several spherical drops of a liquid each of radius r coalesce to form a single drop of radius R. If T is the surface tension, then the energy liberated will be -

Concept Questions :-

Surface tension
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A sample of metal weighs 210 g in air, 140 g in water and 120 g in an unknown liquid. Then -

1.  The density of the metal is

2.  The density of the metal is

3.  The density of the metal is 4 times the density of unknown liquid

4.  The metal still float in water

Concept Questions :-

Archimedes principle
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The rate of flowing of water from the orifice in a wall of a tank will be more if the orifice is:

1.  Near the bottom

2.  Near the upper end

3.  Exactly in the middle

4.  Does not depend upon the position of the orifice

Concept Questions :-

Bernoulli theorem
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Difficulty Level:

A small spherical solid ball is dropped in a viscous liquid. Its journey in the liquid is best described in the figure by :

1.  Curve A

2.  Curve B

3.  Curve C

4.  Curve D

Concept Questions :-

Stokes' law
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Difficulty Level:

Water flows through a frictionless duct with a cross-section varying as shown in the figure. Pressure p at points along the axis is represented by

1. 2.

3.  4.

Concept Questions :-

Equation of continuity
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Difficulty Level:

The area of cross-section of the wider tube shown in the figure is  If a mass of 12 kg is placed on the massless piston, the difference is heights h in the level of water in the two tubes is :

1.  10 cm

2.  6 cm

3.  15 cm

4.  2 cm

Concept Questions :-

Properties of fluids
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Difficulty Level:

In the figure below is shown the flow of liquid through a horizontal pipe. Three tubes A, B, and C are connected to the pipe. The radius of the pipe at A, B, and C is respectively 2 cm, 1 cm, and 2 cm. It can be said that the :

1.  Height of the liquid in the tube A is maximum

2.  Height of the liquid in the tubes A and B is the same

3.  Height of the liquid in all the three tubes is the same

4.  Height of the liquid in the tubes A and C is the same

Concept Questions :-

Bernoulli theorem