Physics · JEE

Viscosity, Stoke's law, terminal velocity, streamline and turbulent flow, critical velocity Mock Test for JEE

21+ syllabus-aligned questions available

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Syllabus context

Part of Properties of Solids and Liquids in JEE Main Physics.

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Q1PhysicsUnit 7: Properties of Solids and Liquids

Assertion A liquid will flow faster and more smoothly from a sealed can when two holes are punched in the can than when one hole is punched. Reason The flow becomes streamlined with two holes rather than with one hole.

Q2PhysicsUnit 7: Properties of Solids and Liquids

Will a parachute work in vacuum?

Q3PhysicsUnit 7: Properties of Solids and Liquids

According to Stoke's law, the viscous drag force, on an oil drop is proportional to:

Q4PhysicsUnit 7: Properties of Solids and Liquids

A marble of mass

x

and diameter

2 r

is gently released a tall cylinder containing honey.If the marble displaces mass

\$ \$ y(\langle 1, x)

of the liquid then the terminal velocity is proportional to

Q5PhysicsUnit 7: Properties of Solids and Liquids

A small metal ball of diameter 4 mm and density

10.5 g / c m^{3}

in dropped in glycerine of density

1.5 g / c m^{3} .

The ball attains a terminal velocity of

8 \mathrm{cm} / \mathrm{sec}

The coefficient of viscosity of glycerine is

Q6PhysicsUnit 7: Properties of Solids and Liquids

A good lubricant should be highly

Q7PhysicsUnit 7: Properties of Solids and Liquids

Due to air a falling body faces a resistive force proportional to square of velocity

v,

consequently its effective downward acceleration is reduced and is given by

a=g-k v^{2}

where

k=

0.002 m^{-1} .

The terminal velocity of the falling body is

(\operatorname{in} \mathrm{m} / \mathrm{s})

Q8PhysicsUnit 7: Properties of Solids and Liquids

The rain drops falling from the sky neither injure us nor make holes on the ground because they move with:

Q9PhysicsUnit 7: Properties of Solids and Liquids

The tangential forces per unit area of the liquid layer required to maintain unit velocity gradient is known as:

Q10PhysicsUnit 7: Properties of Solids and Liquids

Eight drops of a liquid of density

\rho

and each radius a are falling through air with a constant velocity

3.75 \mathrm{cm} s^{-1}

when the eight drops coalesce to from a single drop the terminal velocity of the new drop will be

Q11PhysicsUnit 7: Properties of Solids and Liquids

The profile of advancing liquid is the same at a given point at all times, then the flow is:

Q12PhysicsUnit 7: Properties of Solids and Liquids

Read the following statements and pick the correct choice Statement A: With increase in temperature, viscosity of a gas increases and that of a liquid decreases. Statement B: If the density of a small sphere is equal to the density of the liquid in which it is dropped, then the terminal velocity of the sphere will be zero.

Q13PhysicsUnit 7: Properties of Solids and Liquids

To measure the radius of the drop Millikan used

_{-1-}-

law of freely falling drops.

Q14PhysicsUnit 7: Properties of Solids and Liquids

A copper ball of radius

r

is moving with a uniform velocity

v

in the mustard oil and the dragging force acting on the ball is

F .

The dragging force on the copper ball of radius

2 r

with uniform velocity

2 v

in the mustard oil is

Q15PhysicsUnit 7: Properties of Solids and Liquids

Two spheres of the same material, but of radii

R

and

3 R

are allowed to fall vertically downwards through a liquid of density

\rho .

The ratio of their terminal velocities is:

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For a topic-level test, aim for 20–30 minutes. For a full subject mock, allow 60–90 minutes to mirror JEE timing.

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