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.  100°    

2.  140°  

3.  180°  

4.    60°

 

Concept Questions :-

Surface tension
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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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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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Water flows through a non-uniform tube of area of cross sections A, B, and C whose values are 25, 15, and 35 cm2 respectively. The ratio of the velocities of water at the sections A, B, and C is-

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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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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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 - 

1. 4πR3T 1r-1R2. 2πR3T 1r-1R3. 43πr2T 1r-1R4. 2πRT 1R-1r

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 3 g/cm3

2.  The density of the metal is 7 g/cm3

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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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 :-

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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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