Work of 6.0 x 10${}^{-4}$ Joule is required to be done in increasing the size of a soap film from 10cm x 6cm to 10cm x 11cm. The surface tension of the film is :

1. 5 x 10${}^{-2}$ N/m

2. 6 x 10${}^{-2}$ N/m

3. 1.5 x 10${}^{-2}$ N/m

4. 1.2 x 10${}^{-1}$ N/m

Concept Questions :-

Surface tension
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Difficulty Level:

When a cylindrical tube is dipped vertically into a liquid the angle of contact is 140o. When the tube is dipped with an inclination of 40o, the angle of contact is-

1.

2.

3.

4.    $60°$

Concept Questions :-

Surface tension
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Difficulty Level:

Two liquid drops have their diameters as 1 mm and 2 mm. The ratio of excess pressure in them is :

1.  1:2

2.  2:1

3.  4:1

4.  1:4

Concept Questions :-

Surface tension
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Difficulty Level:

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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Difficulty Level:

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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Difficulty Level:

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