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. $$P_{0}-\frac{4 S}{r}$$

Subtopic:  Capillary Rise |
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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

Subtopic:  Capillary Rise |
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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.

Subtopic:  Capillary Rise |
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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

Subtopic:  Capillary Rise |
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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

Subtopic:  Capillary Rise |
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The rise of a liquid in a capillary tube depends on

(a) the material

(b) the length

(c) the outer radius

(d) the inner radius of the tube

Choose the correct option:

1. (a) and (b)

2. (a), (b) and (c)

3. (a), (b) and (d)

4. All of these

Subtopic:  Capillary Rise |
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When a capillary tube is dipped into a liquid, the liquid neither rises nor falls in the capillary.

 a. the surface tension of the liquid must be zero. b. the contact angle must be $$90^\circ.$$ c. the surface tension may be zero. d. the contact angle may be $$90^\circ.$$

Choose the correct option:

 1 (a) and (b) 2 (b) and (c) 3 (c) and (d) 4 all of these

Subtopic:  Capillary Rise |
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