If two soap bubbles of different radii are connected by a tube,
air flows from the bigger bubble to the smaller bubble till the sizes become equal
air flows from bigger bubble to the smaller bubble till the sizes are interchanged
air flows from the smaller bubble to the bigger
there is no flow of air
Water rises in a capillary tube upto a height of 10 cm whereas mercury depresses in it by 3.42 cm. If the angle of contact and density of mercury are 135o and 13.6 gm/cc respectively, then the ratio of the surface tension of water and mercury will be :
6.5 : 1
1 : 6.5
1 : 5.6
5.6 : 1
A spherical drop of water has 1 mm radius. If the surface tension of water is 70 ×10-3 Nm-1, then difference of pressure between inside and outside of the spherical drop is
35 Nm-2
70 Nm-2
140 Nm-2
zero
Motion of a liquid in a tube is best described by
Bernoulli' theorem
Poiseuille's equation
Stokes' law
Archimedes' principle
The radius of a soap bubble is blown up to double its value under isothermal conditions. If 'r' be the initial radius of bubble, and T be the surface tension, then energy spent in doubling the radius is :
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
4 cm
20 cm
8 cm
10 cm
The radii of two soap bubbles are R1 and R2 . If they coaleasce, the radius of curvature of the common surface will be :
R1 R2
R2 - R1
Water is flowing continuously from a tap having an internal diameter 8×10-3 m. The water velocity as it leaves the tap is 0.4 ms-1. The diameter of the water stream at a distance 2 × 10-1 m below the tap is close to
5.0 × 10-3 m
7.5 × 10-3 m
9.6 × 10-3 m
3.6 × 10-3 m
A water drop of radius R is split into n drops each of radius r. If the surface tension of water be a, the energy required to split the drop is given by :
Water is filled up to a height h in a beaker of radius R as shown in the figure. The density of water is , the surface tension of water is T and the atmospheric pressure is P0 . Consider a vertical section ABCD of the water column through a diameter of the beaker. The force on water on one side of this section by water on the other side of this section has magnitude.