CBSE
Two soap bubbles of radii x and y coalesce to constitute a bubble of radius z. Then z is equal to
x + y
Two solid spheres of same metal but of mass M and 8M fall simultaneously on a viscous liquid and their terminal velocities are v and nv, then value of n is
16
8
4
2
A liquid flows through two capillary tubes A and B connected in series. The length and radius of B are twice those of A. What is the ratio of the pressure difference across A to that across B ?
A uniform long tube is bent into a circle of radius R and it lies in vertical plane. Two liquids of same volume but densities ρ and δ fill half the tube. The angle θ is
A body floats in water with 40% of its volume outside water. When the same body floats in an oil. 60% of its volume remains outside oil. The relative density of oil is
0.9
1.0
1.2
1.5
An object weights m1 in a liquid of density d1 and that in liquid of density d2 is m2. The density d of the object is
Two spheres of equal masses but radii r1 and r2 are allowed to fall in a liquid of infinite column. The ratio of their terminal velocities is
1
r1 : r2
r2 : r1
A stone of relative density K is released from rest on the surface ofa lake. If viscous effects are ignored, the stone sinks in water with an acceleration of
g (1 − K)
g (1 + K)
A body floats in water with 40% of its volume outside water. When the same body floats in oil, 60% of its volume remains outside oil. The relative density of the oil is
0.9
1.2
1.5
1.8
n identical droplets are charged to V volt each. if they coalesce to form a single drop, then its potential will be
n2/3V
n1/3V
nV
V/n