Surface Tension

A rectangular film of liquid is extended from to If the work done is then the value of the surface tension of the liquid is:

1.		2.
3.		4.

A soap bubble, having a radius of , is blown from a detergent solution having a surface tension of $$. The pressure inside the bubble equals at a point below the free surface of the water in a container. Taking ${\mathrm{}}^{}$, the density of water ${\mathrm{}}^{}$, the value of is:
1.
2.
3.
4.

If a soap bubble expands, the pressure inside the bubble:
1. is equal to the atmospheric pressure
2. decreases
3. increases
4. remains the same

The amount of energy required to form a soap bubble of radius from a soap solution is nearly:
the surface tension of soap solution
1.
2.
3.
4.

A thin flat circular disc of radius is placed gently over the surface of water. If the surface tension of water is then the excess force required to take it away from the surface is:
1.
2.
3.
4.

Consider a water tank shown in the figure. It has one wall at and can be taken to be very wide in the direction. When filled with a liquid of surface tension and density the liquid, surface makes angle with the axis at If is the height of the surface then the equation for is:

(take is the acceleration due to gravity)

1.		2.
3.		4.