Tag: pressure

Questions Related to pressure


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.

Atmospheric pressure is ______ $Nm^{-2}$ at sea level.

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

  1. $2.026 \times 10^5$

  2. $1.013 \times 10^5$

  3. $3.039 \times 10^5$

  4. $1.013 \times 10^6$

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Correct Option: B
Explanation:
  • The atmospheric pressure is 1.013x${10}^5$ N/${m}^-2$

_________ invented a pump to extract air out of the vessel.

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

  1. Otto von Guericke

  2. Newton

  3. Albert Einstein

  4. Gallileo

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Correct Option: A
Explanation:

Otto von Guericke was a scientist of 17th century.  He invented a pump to extract air out of the vessel.

What happens when pressure inside a sealed can is less than the atmospheric pressure?

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

  1. The can is crushed

  2. The can bursts

  3. No change is observed

  4. The can swells

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Correct Option: A
Explanation:

When pressure inside a sealed can becomes less than the atmospheric pressure, the atmospheric pressure pushes the surface of the can inside and the can is crushed.

What happens, when the pressure inside a sealed bottle exceeds the atmospheric pressure?

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

  1. The bottle bursts out

  2. The bottle gets crushed

  3. The bottle remains as it is

  4. None of the above

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Correct Option: A
Explanation:

When the pressure inside a sealed bottle exceeds the atmospheric pressure, it bursts out.

In crushing can experiment the can gets crushed because of:

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

  1. dcrease in internal pressure

  2. Increase in internal pressure

  3. increase in atmospheric pressure

  4. decrease in atmospheric pressure

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Correct Option: A
Explanation:

Crushing can experiment , Take an empty and absolutely clean Mobil oil can and put in it about 0.25 liter of water. Great the can in fire till all the air is expelled out and the steam comes out freely from its mouth.screw the mouth of the can with a lid and immediately remove it away from the fire .pour cold water on the can. It is found that the can gets crushed.the reason is that on pouring cold water, the steam changes into water ,thereby,causing a vacuum inside the can. Thus the tremendous atmospheric pressure,exerts pressure from outside and crushed the can.

Which of the following is a unit of atmospheric pressure.

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

  1. $torr$

  2. $bar$

  3. $atm$

  4. all of the above

Show answer
Correct Option: D
Explanation:

$1 atm = 76 cm$ of Hg, $1 torr  1 mm$ of Hg, $1 bar = 10^5 Pa$.