Fluids are liquids and gases that have the ability to flow. In a fundamental aspect, this feature distinguishes liquids and gases from solids. Fluids can be found everywhere around us. When we subject a fluid to shear stress or an external force, it continuously flows or deforms. Fluids include liquids, gases, and plasmas, and they are one of the phases of matter. Fluids, according to the scientific definition, are substances with zero shear modulus, or, to put it another way, substances that cannot resist the shear force given to them.

Fluid is a substance which has the ability to flow. They do not have a definite shape, and they take the shape of the container. Both liquids and gases are considered as fluids.

EASY

Earn 100

What are fluids?

Important Questions on Pressure

MEDIUM

Science>Physics>Pressure>Pressure Exerted by Liquids

A block of mass

3 kg

and density

ρ

, suspended from a spring balance is immersed in a liquid of density

\frac{ρ}{3}

. Then the balance would read weight as:

EASY

Science>Physics>Pressure>Pressure Exerted by Liquids

A beaker is filled with a liquid of density

ρ

up to a height

h

. If the beaker is at rest, then the mean pressure on the walls of the beaker is:

EASY

Science>Physics>Pressure>Pressure Exerted by Liquids

The pressure of the water at the bottom of the pond is ____ at the surface of the pond.

EASY

Science>Physics>Pressure>Pressure Exerted by Liquids

The pressure of a liquid at the same horizontal plane at all points is _____ (equal/ different).

EASY

Science>Physics>Pressure>Pressure Exerted by Liquids

Why are liquids and gases regarded as fluids?

MEDIUM

Science>Physics>Pressure>Pressure Exerted by Liquids

A uniform tapering vessel shown in figure is filled with liquid of density

900 k g m^{- 3}

. The force that acts on the base of the vessel due to liquid is (take g =

10 m s^{- 2}

)

EASY

Science>Physics>Pressure>Pressure Exerted by Liquids

Why do the shape and size of the balloon change when filled with air or water?

MEDIUM

Science>Physics>Pressure>Pressure Exerted by Liquids

Describe an experiment to show that a liquid exerts pressure at the bottom of the container in which it is kept.

HARD

Science>Physics>Pressure>Pressure Exerted by Liquids

Derive mathematically that pressure exerted by a liquid at a point inside it is

h d g

MEDIUM

Science>Physics>Pressure>Pressure Exerted by Liquids

A cylindrical vessel is filled with equal amounts of weight of mercury on water. The overall height of the two layers is

29.2 cm

, specific gravity of mercury is

13.6

. Then the pressure of the liquid at the bottom of the vessel is

EASY

Science>Physics>Pressure>Pressure Exerted by Liquids

Pressure exerted by a liquid on a container (in which it is enclosed) acts on

EASY

Science>Physics>Pressure>Pressure Exerted by Liquids

Distinguish between the pressure exerted by a solid and that by a liquid.

HARD

Science>Physics>Pressure>Pressure Exerted by Liquids

A U-tube of base length

l

filled with same volume of two liquids of densities

ρ

and

2 ρ

is moving with an acceleration

a

on the horizontal plane. If the height difference between the two surfaces (open to atmosphere) becomes zero, then the height h is given by-

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EASY

Science>Physics>Pressure>Pressure Exerted by Liquids

An empty plastic bottle closed with an airtight stopper is pushed down into a bucket filled with water. As the bottle is pushed down, the force on the bottle increases as shown in the graph. This is because

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