Atmospheric Pressure and Gauge Pressure

IMPORTANT

Atmospheric Pressure and Gauge Pressure: Overview

This topic covers concepts, such as Absolute Pressure, Gauge Pressure, Hydrostatic Paradox, Atmospheric Pressure, Units Used for Atmospheric Pressure, Measurement of Atmospheric Pressure, Atmospheric Pressure in Terms of Mercury Column, etc.

Important Questions on Atmospheric Pressure and Gauge Pressure

MEDIUM
IMPORTANT

The pressure at the bottom of a tank of water is 3P where P is the atmospheric pressure. If the water is drawn out till the level of water is lowered by one-fifth, the pressure at the bottom of the tank will now be

MEDIUM
IMPORTANT

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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EASY
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An open U-tube contains mercury. When 13.6 cm of water is poured into one of the arms of the tube, then the mercury rise in the other arm from its initial level is

EASY
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A manometer reads the pressure of a gas in an enclosure as shown in figure. The absolute and gauge pressure of the gas (in cm of mercury) in the enclosure is
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(Take atmospheric pressure = 76 cm of Hg)

EASY
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 A vessel filled with a liquid of density ρ falls vertically downwards with an acceleration a(<g). The gauge pressure P at depth h below the free surface of liquid is :
 

EASY
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The height of the mercury column in a simple barometer is h. As the tube is inclined with the vertical at an angle α, the length of the mercury column along the length of the tube will become 

MEDIUM
IMPORTANT

The height of mercury column in a simple barometer is h. As the tube is inclined with the vertical at an angle α, then length of mercury column along the length of the tube will become

HARD
IMPORTANT

Water of density ρ in a clean aquarium forms a meniscus, as illustrated in the figure. Calculate the difference in height h between the centre and the edge of the meniscus. The surface tension of water is γ.

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EASY
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A U-tube of uniform cross-section initially contained a liquid of density 2ρ and had a length of L in the tube. Now another liquid (immiscible with the previous liquid) of density ρ is poured in the U tube from one end such that this liquid also fills length L in the tube. Find the difference in the levels of the liquid on the two sides of the tubery

MEDIUM
IMPORTANT

A mercury barometer has a cylindrical capillary tube of radius r=2 mm inverted vertically on the mercury in the trough. Atmospheric pressure is 76 cm of mercury but the level of mercury in the capillary is 75 cm. The portion of the tube without mercury is 10 cm in length. Considering that this region is occupied by ideal gasses, the number of moles of the ideal gas will be : (Given: Temperature =37°C)

EASY
IMPORTANT

Which instrument is used to measure atmospheric pressure ?

HARD
IMPORTANT

A siphon in use is demonstrated in the following figure. The density of the liquid flowing in siphon is 1.5 g cm-3. The pressure difference between the point P and S will be

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EASY
IMPORTANT

With the increasing altitude, gauge pressure:

MEDIUM
IMPORTANT

In the space above the mercury column in a barometer tube the gauge pressure of the vapour is

EASY
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In the space above the mercury column in a barometer tube, the gauge pressure of the vapour is

EASY
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Which of the following instrument is used to measure atmospheric pressure?

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_____ is an instrument used to measure the atmospheric pressure.

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Assuming that the atmosphere has the same density anywhere as at sea level ρ=1.3 kg m-3 and g to be constant g=10 m s-2. What should be the approximate height of the atmosphere p0=1.01×105 N m-2

EASY
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In a barometer, the mercury level is 76 cm at sea level. On a hill of height 3 km, if the ratio of density of Hg to that of air is 104, the atmospheric pressure on the hill is

EASY
IMPORTANT

The pressure at the bottom of a open water tank 3P0 where P0 is atmospheric pressure. If water is drawn out till the water level decreases by 23 rd, then pressure at the bottom of the tank will be