Liquid rises to a height of 2 cm in a capillary tube. The angle of contact between solid and liquid is zero. The tube is depressed more now so that the tip of the capillary tube is only 1 cm above the liquid, the apparent angle of contact between solid and liquid is
0o
30o
60o
90o
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
Work done to blow a bubble of volume V is W. The work done in blowing a bubble of volume 2V will be :
21/3 W
2W
41/3 W
4W
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
If there were no gravity, which of the following will not be there for a fluid ?
Viscosity
Surface tension
Pressure
Archimedes' upward thrust
There is a small hole in a hollow sphere. The water enters in it when it is taken to a depth of 40 cm under water. The surface tension of water is The diameter of hole is :
14mm
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
A wooden block, with a coin placed on its top, floats in water as shown in figure. The distance l and h are shown here. After some time the coin falls into the water. Then
l decreases and h increases
l increases and h decreases
both l and h increase
both l and h decrease
An object is moving through the liquid. The viscous damping force acting on its is proportional to the velocity. Then dimensions of constant of proportionality are
[ ML-1 T--1 ]
[ MLT--1 ]
[ ML0 LT-1 ]
[ ML0 T--1 ]
A liquid X of density 3.36 g/cm3 is poured in the right arm of a U-tube, which contains Hg. Another liquid Y is poured in left arm with height 8 cm, upper levels of X and Y are same. What is density of Y ?
0.8 g/cm3
1.2 g/cm3
1.4 g/cm3
1.6 g/cm3
