Tag: pressure

Questions Related to pressure

In the above problem what is the pressure necessary to accomplish this task $(g=9.8\ m/s^{2})$

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

  1. $1.87\times 10^{5}\ N/m^{2}$

  2. $18.7\times 10^{5}\ N/m^{2}$

  3. $2.87\times 10^{5}\ N/m^{2}$

  4. $28.7\times 10^{5}\ N/m^{2}$

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Correct Option: C

What is the mass of $2$ litres of nitrogen at $22.4$ atmospheric pressure and $273\ K$ 

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

  1. $28\ g$

  2. $14 \times 22.4 g$

  3. $56\ g$

  4. $none\ of\ these$

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Correct Option: A
Explanation:

Consider STP conditions:
 
1) 1 mol = 22.4 L of gas; 1 mol of Nitrogen gas = 14 g
 
2) Therefore, 22.4 L Nitrogen gas = 14 g → 2 L Nitrogen = 1.25 g
 

3) This is at a standard pressure of 1 atm. So, 22.4 atm pressure corresponds to 22.4 × 1.25 = 28 g  

A sphere floats in water just submerged as shown in the diagram. If atmospheric pressure is neglected

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

  1. Force exerted by liquid on lower half of sphere is $\dfrac{4\rho\pi\ R^{2}}{3}g$

  2. Force exerted by liquid on lower half of sphere and upper half of sphere is same in magnitude

  3. Ratio of magnitude of forces exerted by liquid on lower and upper half of sphere is $5:1$

  4. Ratio of magnitude of forces exerted by liquid on lower and upper half of sphere is $4:1$

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Correct Option: C

A barometer tube, containing mercury, is lowered in a vessel containing mercury until only $50 cm$ of the tube is above the level of mercury in the vessel. If the atmospheric pressure is $75 cm$ of mercury, what is the pressure at the top of the tube

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

  1. $33.3 kPa$

  2. $66.7kPa$

  3. $3.33 MPa$

  4. $6.67 MPa$

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Correct Option: A
Explanation:

Since the mercury rises only $50cm$ it implies the rest of the excess atmospheric pressure is being countered by the pressure at the top of the tube.
So pressure at top=atmospheric pressure - $50cm$ of Hg=$(75-50)cm=25cm$ of Hg=$1/3\times 100kPa= 33.33kPa$

$2\ kg$ of water is converted into steam by boiling at atmospheric pressure. The volume changes from $2\times 10^{-3}\ m^{3}$ to $3.34\ m^{3}$. The work done by the system is about

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

  1. $-340\ kJ$

  2. $-170\ kJ$

  3. $170\ kJ$

  4. $340\ kJ$

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Correct Option: A

On the surface of earth, the atmospheric pressure is minimum at the sea-level.

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

  1. True

  2. False

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Correct Option: B

Match List I with List II and select the correct answer by using the codes given the lists.

List I List II
A. Baremeter $1$. Used for Measuring altitudes and angles in navigation and astronomy
B. Chronometer $2$. Used for measurement of angular distances between two digits
C. Sextant $3$. Keeps the accurate time as the one that is used to determine longitude at sea
D. Quadrant $4$. Used for measuring atmospheric pressure
$5$. An instrument used in the diagnosis of pregnancy
physics pressure common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

  1. A-$1$, B-$4$, C-$2$, D-$3$

  2. A-$4$, B-$2$, C-$5$, D-$1$

  3. A-$2$, B-$3$, C-$5$, D-$4$

  4. A-$4$, B-$3$, C-$2$, D-$1$

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Correct Option: D

Average density of air is:

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

  1. $\displaystyle 13600{ kg }/{ { m }^{ 3 } }$

  2. $\displaystyle 1.29{ kg }/{ { m }^{ 3 } }$

  3. Both

  4. All

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Correct Option: B
Explanation:

Average density of air is $\displaystyle 1.29{ kg }/{ { m }^{ 3 } }$ and the density of mercury as $\displaystyle 13600{ kg }/{ { m }^{ 3 } }$.

If the air pressure is below 76cm,we can say that air pressure has:

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

  1. Fallen

  2. Increased

  3. Both

  4. All

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Correct Option: A
Explanation:

If the barometric height is less than 76 cm,we can say that the air pressure has fallen,and if more than 76 cm ,we can say that air pressure has increased.

Which of the following causes change in air pressure?

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

  1. Height

  2. Season

  3. Temperature

  4. All

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Correct Option: D
Explanation:

it is found that with the change in height, season, temperature etc the barometric height changes, This indicates change in air pressure.