Tag: important points about atmospheric pressure

Questions Related to important points about atmospheric pressure

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. $1.013 \times 10^6$

Show answer
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

Show answer
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

Show answer
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

Show answer
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

Show answer
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, $1 bar = 10^5 Pa$.

When a plane moves along the runway, the air above the wing speeds up more, So the pressure

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

  1. Lowers

  2. Increases

  3. Raises

  4. No Pressure

Show answer
Correct Option: A
Explanation:
According to Bernoulli's theorem        $ P + \rho gh+ \dfrac{1}{2}\rho v^2= constant$
$\implies$  When $v$ is increases, then pressure $(P)$ is lowers.

An instrument commonly used for measurement of atmospheric pressure is known as

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

  1. Manometer

  2. Barometer

  3. Calorimeter

  4. Potentiometer

Show answer
Correct Option: B
Explanation:

Barometer is a scientific instrument which is used to caliberate pressure at different surroundings & pressure.

Which of the following are the examples of atmospheric pressure?

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

  1. Fountain bottle

  2. Ping pong funnel

  3. Million dollar bet

  4. All of the above

Show answer
Correct Option: D
Explanation:

Fountain bottle, ping pong funnel as well as million doller bet are examples of atmospheric pressure.

 1 mm Hg is equal to

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

  1. 1 atm

  2. 1.013 $\times$10$^5$ Pa

  3. 133.29 atm

  4. 1.316 $\times$10$^{-3}$ atm

Show answer
Correct Option: D
Explanation:

760 mm Hg  $  =1$ atm

$\therefore$  1 mm Hg $ = \dfrac{1}{760}  =1.316\times 10^{-3}$ atm