When water droplets merge to form a bigger drop:

1.	energy is liberated.
2.	energy is absorbed.
3.	energy is neither liberated nor absorbed.
4.	energy may either be liberated or absorbed depending on the nature of the liquid.

Air is pushed into a soap bubble of radius r to double its radius. If the surface tension of the soap solution is S, the work done in the process is

1. 8 \(\pi\) r² S

2. 12 \(\pi\) r² S

3. 16 \(\pi\) r² S

4. 24 \(\pi\) r² S

If more air is pushed in a soap bubble, the pressure in it

1. decreases

2. increases

3. remains same

4. becomes zero

If two soap bubbles of different radii are connected by a tube,

The figure shows a capillary tube of radius r dipped into water. If the atmospheric pressure is P₀, the pressure at point A is pressure at point A is

1. \(P_{0}\)

2. \(P_{0}+\frac{2 S}{r}\)

3. \(P_{0}-\frac{2 S}{r}\)

4. \(P_{0}-\frac{4 S}{r}\)

The excess pressure inside a soap bubble is twice the excess pressure inside a second soap bubble. The volume of the first bubble is n times the volume of the second where n is

1. 4

2. 2

3. 1

4. 0.125

Which of the following graphs may represent the relation between the capillary rise h and the radius r of the capillary?

1.

2.

3.

4.

Water rises in a vertical capillary tube upto a length of 10 cm. If the tube is inclined at 45°, the length of water risen in the tube will be

1. 10 cm

2. 10\(\sqrt2\)cm

3. 10/\(\sqrt2\)cm

4. none of these

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

Viscosity is a property of:
1. liquids only
2. solids only
3. solids and liquids only
4. liquids and gases only