A sphere of mass m and radius r is falling in the column of a viscous fluid. Terminal velocity attained by falling object is proportional to
r2
1/ r
r
-1 / r2
Spherical balls of radius R are falling in a viscous fluid of viscosity η with a velocity v. The retarding viscous force acting on the spherical ball is
directly proportional to R but inversely proportional to v
directly proportional to both radius R and velocity v
inversely proportional to both radius R and velocity v
inversely proportional to radius R and directly proportional to velocity v.
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
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 drop of water of volume 0.05 cm3 is pressed between two glass plates, as a consequence of which spreads and occupies an area of 40 cm2 . If the surface tension of water is 70 dyne/cm, then the normal force required to separate out the two glass plates will be :
22.5 N
45.0 N
90.0N
450.0N
A jar is filled with two non-mixing liquids 1 and 2 having densities ρ1 and ρ2 respectively.
A solid ball, made of a material of density ρ3 , is dropped in the jar. It comes to equilibrium in the position shown in the figure. Which of the following is true for ρ1 and ρ2 and ρ3 ?
ρ1 < ρ3 < ρ2
ρ3 < ρ1 < ρ2
ρ1 > ρ3 > ρ2
ρ1 < ρ2 < ρ3
If there were no gravity, which of the following will not be there for a fluid ?
Viscosity
Surface tension
Pressure
Archimedes' upward thrust
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
From the following figures, the correct observation is
the pressure on the bottom of tank A is greater than that at the bottom of B
the pressure on the bottom of the tank A is smaller than that at the bottom of B
the pressure depends on the shape of the container
the pressure on the bottoms of A and B is the same
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