The flow rate from a tap of diameter 1.25 cm is 3 lit/min. The coefficient of viscosity of water is 10-3 Pas. The nature of flow is :

1. Turbulent

2. Laminar

3. Neither laminar nor turbulent

4. data inadequate

Concept Questions :-

Types of flow
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Water flowing from a hose pipe fills a 15-liter container in one minute. The speed of water from the free opening of radius 1 cm is (in ms-1) :

1. 2.5

2. π2.5

3. 2.5π

4. 5 π

Concept Questions :-

Equation of continuity
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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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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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