Tag: important points about atmospheric pressure

Questions Related to important points about atmospheric pressure

The volume of a given amount of water ______ when its temperature is increased form $0^0 C$ to $4^0 C$.

physics pressure in liquids and gases common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

  1. decreases

  2. remains the same

  3. increase

  4. first increases and then decreases.

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Correct Option: A

A air bubble rises from bottom of a lake to surface If its radius increases by 200% and atmospheric pressure is equal to water coloumn of height H. then depth of lake is 

physics pressure in liquids and gases common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

  1. 21H

  2. 8H

  3. 9H

  4. 26H

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Correct Option: B

A large bottle is fitted with a capillary siphon. Ratio of times taken to empty the bottle when it is filled with (i) water (ii) petroleum of relative density 0.8.

$( _{water} = 0.001poise, _{petroleum} = 0.002 poise, d _{water} = 1000 kg/m^3)$

physics pressure in liquids and gases common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

  1. 5/4

  2. 4/5

  3. 2/5

  4. 3/5

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Correct Option: C

Siphon will fail to work if

physics pressure in liquids and gases common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

  1. the densities of the liquid in the two vessels are equal

  2. the level of the liquid in the two vessels are at the same height

  3. both its limbs are of unequal length

  4. the temperature of the liquids in the two vessels are the same

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Correct Option: B

A ${ 16cm }^{ 3 }$ volume of water flows per second through a capillary tube of radius r cm and of length 1 cm, when connected to a pressure head of h cm of water. If a tube of the same length and radius r/2 is connected to the same pressure head, find the mass of water flowing per minute through the tube 

physics pressure in liquids and gases common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

  1. 80 gram/min

  2. 70 gram/min

  3. 60 gram/min

  4. 50 gram/min

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Correct Option: C

If it takes $5$ minutes to fill a 15 litre bucket  from a water tap of diameter $\frac{2}{\sqrt{\pi}}$ cm then the Reynolds number for the flow is (density of water = $10^3 kg/m^3$ and viscosity of water = $10^{-3}$Pa.s) close to

physics pressure in liquids and gases common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

  1. $11,000$

  2. $550$

  3. $1100$

  4. $5500$

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Correct Option: D


In a weather map, lines joining all those regions with same atmospheric pressure are called

physics pressure common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

  1. Bars

  2. Millibars

  3. Isobars

  4. None

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Correct Option: C
Explanation:

In a weather map, lines joining all those regions with same atmospheric pressure are called isobars.

Atmospheric pressure at sea level is

physics pressure common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

  1. 1.013 103 Pa

  2. 1.013 104 Pa

  3. 1.013 105 Pa

  4. 1.013 106 Pa

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Correct Option: C
Explanation:

Atmospheric pressure at sea level is $ 1.013 105 \times 10^5 $ Pa.

Unit for pressure used in weather maps is millibar. 1 millibar is equal to

physics pressure common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

  1. 1000 bar

  2. 100kPa

  3. 100Pa

  4. 1atm

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Correct Option: C
Explanation:

1 bar $ = 10^5$ Pa

$\therefore$  1 millibar $ = 100$ Pa

We sit in the room with windows open. Then

physics pressure common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

  1. Air pressure on the floor of the room equals the atmospheric pressure but the air pressure on the ceiling is eligible

  2. Air pressure is nearly the same on the floor, the walls and ceiling

  3. Air pressure on the floor equals the weight of the air coloumn inside the room (from floor to the ceiling) per unit area

  4. Air pressure on the walls is zero since the weight of air acts downward

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Correct Option: B
Explanation:

Pressure of gas is same everywhere in the vessel.