Two drops of equal radius coalesce to form a bigger drop. What is ratio of surface energy of bigger drop to smaller one ?
21/2 : 1
1 : 1
22/3 : 1
none of these
A U-tube of uniform cross-section is partially filled with a liquid I. Another liquid II which does not mix with liquid I is poured into one side. It is found that the liquid levels of the two sides of the tube are the same, while the level of liquid I has risen by 2 cm. If the specific gravity of liquid I is 1.1, the specific gravity of liquid II must be
1.12
1.1
1.05
1.0
In old age arteries carrying blood in the human body become narrow resulting in an increase in the blood pressure. This follows from
Pascal's law
Stokes's law
Bernoulli's principle
Archimedes' principle
If for gas, R/Cv =0.67, this gas is made up of molecules which are
diatomic
mono atomic
triatomic
cannot say
Work done in increasing the size of a soap bubble from a radius of 3 cm to 5 cm is nearly (surface tension of soap solution = 0.03 Nm-1 )
4 mJ
0.2 mJ
2 mJ
0.4 mJ
The ratio of the terminal velocities of two drops of radii R and R/2 is
2
1
1/2
4
PQRS is a rectangular frame of copper wire shown in figure. The side RS of the frame is movable. If a soap film is formed on it then the diameter of the wire to maintain equilibrium will be (given surface tension of soap solution=0.045 N/m and density of copper = 8.96 x 103 kg/m3 ).
0.12 m
1.2 cm
1.2 mm
2.4 mm
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 drops are in the ratio of 3 : 2, their terminal velocities are in the ratio
9 : 4
2 : 3
3 : 2
2 : 9
A 15 cm x 6 cm x 0.1 cm slide suspended with its longest side vertical. 10% part of this slide is dipped into the water. In this state its apparent weight is equal to its real weight. The surface tension of water will be :
72.3 N/m
723 N/m
