EASY

Earn 100

What are the advantages of using mercury as a barometric liquid?

Important Questions on Fluids

MEDIUM

Science>Physics>Fluids>Atmospheric Pressure

U

tube with both ends open to the atmosphere is partially filled with water. Oil, which is immiscible with water, is poured into one side until it stands at a distance of

10 mm

above the water level on the other side. Meanwhile, the water rises by

65 mm

from its original level (see diagram). The density of the oil is ____

(ρ_{w} = 1000 kg m^{- 3})

HARD

Science>Physics>Fluids>Atmospheric Pressure

Consider a vessel filled with a liquid upto height

H .

The bottom of the vessel lies in the

X - Y

plane passing through the origin. The density of the liquid varies with

Z

-axis as

ρ (z) = ρ_{0} [2 - {(\frac{z}{H})}^{2}]

. If

P_{1}

and

P_{2}

are the pressures at the bottom surface and top surface of the liquid, the magnitude of

(P_{1} - P_{2})

is :

EASY

Science>Physics>Fluids>Atmospheric Pressure

At sea level, the height of the mercury column in a barometer is _____.

MEDIUM

Science>Physics>Fluids>Atmospheric Pressure

Calculate the difference $(h)$ in water levels in two communicating capillary tubes of radius $1 mm$ and $1.5 mm$ .

(Surface tension of water is $0 .07 N m^{- 1}$ )

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MEDIUM

Science>Physics>Fluids>Atmospheric Pressure

The value of

g

at a place decreases by

2 %

. The barometric height of the mercury

EASY

Science>Physics>Fluids>Atmospheric Pressure

An open ended

H g

manometer is used to measure the pressure exerted by a trapped gas as shown in the figure. Atmospheric pressure is

749 m . m .

H g

. What is the pressure of the trapped gas-

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MEDIUM

Science>Physics>Fluids>Atmospheric Pressure

The pressure on a swimmer 20 m below the surface of water at sea level is

EASY

Science>Physics>Fluids>Atmospheric Pressure

Which of the following quantity is measured by a simple barometer?

EASY

Science>Physics>Fluids>Atmospheric Pressure

_____ is a device which is used to measure the atmospheric pressure and can be used in weather forecasting.

MEDIUM

Science>Physics>Fluids>Atmospheric Pressure

The top surface of an incompressible liquid is open to the atmosphere. The pressure at a depth

P_{1} .

How does the pressure

P_{2}

at depth

h_{2} = 2 h_{1}

compare with

P_{1} ?

MEDIUM

Science>Physics>Fluids>Atmospheric Pressure

If pressure at half the depth of a lake is equal to 2/3 pressure at the bottom of the lake then what is the depth of the lake?

HARD

Science>Physics>Fluids>Atmospheric Pressure

A glass tube

80 cm

long and open at both ends is half immersed in mercury. Then the top of the tube is closed and it is taken out of the mercury. A column of mercury

20 cm

long then remains in the tube. The atmospheric pressure (in

cm

Hg

) is

HARD

Science>Physics>Fluids>Atmospheric Pressure

A tank is filled with a liquid upto a height H. A small hole is made at the bottom of this tank. Consider

t_{1}

be the time taken to empty first half of the tank and

t_{2}

be the time taken to empty rest half of the tank. Then, determine the ratio

\frac{t_{1}}{t_{2}}

MEDIUM

Science>Physics>Fluids>Atmospheric Pressure

A piston of mass M = 3kg and radius R = 4cm has a hole into which a thin pipe of radius r = 1cm is inserted. The piston can enter a cylinder tightly and without friction, and initially it is at the bottom of the cylinder. 750gm of water is now poured into the pipe so that the piston & pipe are lifted up as shown. Find the height H of water in the cylinder h of water in the pipe
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