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CBSE

Subject

Physics

NEET Physics : Mechanical Properties of Fluids

Multiple Choice Questions

131.

Two soap bubbles of radii x and y coalesce to constitute a bubble of radius z. Then z is equal to

$\sqrt{x^{2} + y^{2}}$
$\sqrt{x + y}$
x + y
$\frac{x + y}{2}$

132.

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

133.

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

134.

n identical droplets are charged to V volt each. if they coalesce to form a single drop, then its potential will be

n^2/3V
n^1/3V
nV
V/n

Short Answer Type

135.

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 ?

Multiple Choice Questions

136.

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
$\sqrt{r_{1}} : \sqrt{r_{2}}$

137.

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

$\frac{m_{2} d_{2} - m_{1} d_{1}}{m_{2} - m_{1}}$
$\frac{m_{1} d_{1} - m_{2} d_{2}}{m_{2} - m_{1}}$
$\frac{m_{2} d_{1} - m_{1} d_{2}}{m_{1} - m_{2}}$
$\frac{m_{1} d_{2} - m_{2} d_{1}}{m_{1} - m_{2}}$

138.

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)
$g (1 - \frac{1}{K})$
$g (1 + \frac{1}{K})$

139.

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

140.

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

$\tan^{- 1} (\frac{ρ - δ}{ρ + δ})$
$\tan^{- 1} (\frac{ρ}{δ})$
$\tan^{- 1} (\frac{δ}{ρ})$
$\tan^{- 1} (\frac{ρ + δ}{ρ - δ})$

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