Two bubbles A and B are joined through a narrow tube where bubble A is bigger. Then 

1. The size of A will increase

2. The size of B will increase

3. The size of B will increase until the pressure equals

4. None of these

Two soap bubbles have different radii but their surface tension is the same. Mark the correct statement

1. Internal pressure of the smaller bubble is higher than the internal pressure of the larger bubble

2. Pressure of the larger bubble is higher than the smaller bubble

3. Both bubbles have the same internal pressure

4. None of the above

If the excess pressure inside a soap bubble is balanced by oil column of height 2 mm, then the surface tension of soap solution will be (r = 1 cm and density d = 0.8 gm/cc)

1. 3.9 N/m                 

2. $3.9\times {10}^{-2}<mspace\; width="1em"></mspace>\mathrm{N}/\mathrm{m}$

3. $3.9\times {10}^{-3}<mspace\; width="1em"></mspace>\mathrm{N}/\mathrm{m}$       

4. 3.9 dyne/m

Due to capillary action, a liquid will rise in a tube, if the angle of contact is 

1. Acute

2. Obtuse

3. 90°

4. Zero

Two capillary tubes P and Q are dipped in water. The height of water level in capillary P is 2/3 to the height in Q capillary. The ratio of their diameters is

1. 2 : 3                           

2. 3 : 2

3. 3 : 4                           

4. 4 : 3

By inserting a capillary tube up to a depth l in water, the water rises to a height of h ( h<l). If the lower end of the capillary is closed inside the water and the capillary is taken out and closed-end opened, to what height the water will remain in the tube?

1. Zero

2. l+h 

3. 2h

4. h

If the surface tension of water is 0.06 ${\mathrm{Nm}}^{-1}$, then the capillary rise in a tube of diameter 1 mm is ( $\mathrm{\theta }$=0° )

1. 1.22 cm                               

2. 2.44 cm

3. 3.12 cm                               

4. 3.86 cm

If the capillary experiment is performed in a vacuum, then for a liquid there capillary rise 

(1) It will rise

(2) Will remain the same

(3) It will fall

(4) Rise to the top

If liquid level falls in a capillary then radius of capillary will

(1) Increase                     

(2) Decrease

(3) Unchanged                 

(4) None of these

Two capillary tubes of the same diameter are put vertically one each in two liquids whose relative densities are 0.8 and 0.6 and surface tensions are 60 and 50 dyne/cm respectively Ratio of heights of liquids in the two tubes $\frac{{\mathrm{h}}_1}{{\mathrm{h}}_2}$ is

(1) $\frac{10}{9}$

(2) $\frac{3}{10}$

(3) $\frac{10}{3}$

(4) $\frac{9}{10}$