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
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
The rain drops are in spherical shape due to
viscosity
surface tension
thrust on drop
residual pressure
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
At critical temperature, the surface tension of a liquid
is zero
is infinity
is same as that any other temperature
cannot be determined
The SI unit of surface tension is
dyne/cm
N/m2
N/m
Nm
A man is sitting in a boat, which is floating on a pond. If the man drinks some water from the pond, the level of water in the pond.
decreases
increases
remains unchanged
may increase or decrease depending on the weight of the man.
There is a small bubble at one end and bigger bubble at other end of a rod. What will happen ?
smaller will grow until they collapse
bigger will grow until they collapse
remain in equilibrium
none of the above
