CBSE
A 20 cm long capillary tube is dipped vertically in water and the liquid rises upto 10 cm. If the entire system is kept in a freely falling platform, the length of the water column in the tube will be
5 cm
10 cm
15 cm
20 cm
A drop of some liquid of volume 0.04 cm3 is placed on the surface of a glass slide. Then another glass slide is placed on it in such a way that the liquid forms a thin layer of area 20 cm2 between the surfaces of the two slides. To separate the slides a force of 16 x105 dyne has to be applied normal to the surfaces. The surface tension of the liquid is (in dyne-cm-1)
60
70
80
90
A diver at a depth of 12 m in water sees the sky in a cone-of semivertical angle
90°
Air inside a closed container is saturated with water vapour. The air pressure is p and the saturated vapour pressure of water is . If the mixture is compressed to one-half of its volume by maintammg temperature constant, the pressure becomes
A small metal sphere of radius a is falling with a velocity v through a vertical column of a viscous liquid. If the coefficient of viscosity of the liquid is η, then the sphere encounters an opposing force of
The wettability of a surface by a liquid depends primarily on
viscosity
surface tension
density
angle of contact between the surface and the liquid
A body when fully immersed in a liquid of specific gravity 1.2 weighs 44 gwt. The same body when fully immersed in water weighs 50 gwt. The mass of the body is
36 g
48 g
64 g
80 g
Water is flowing through a very narrow tube. The velocity of water below which the flow remains a streamline flow is known as
relative velocity
terminal velocity
critical velocity
particle velocity
In the given (V-T) diagram, what is the relation between pressures p1 and p2 ?
p2 = p1
p2 > p1
p2 < p1
Cannot be predicted
To determine the composition of a bimetallic alloy, a sample is first weight in air and then in water. These weights are found to be w1 and w2 respectively. If the densities of the two constituents metals are ρ1 and ρ2 respectively, then the weight of the first metal in the sample is (where ρw is the density of water)