Tag: common consequences of the atmospheric pressure

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Multiple choice physics pressure in fluids and atmospheric pressure common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

one -meter long tube closed at both the ends is lying horizontally. A mercury column of length 0.1 m is filled in its middle and in rest in two parts air is filled at atmospheric pressure. when the tube is turned to verticle position then displacement of mercury column will be 

  1. 29m

  2. 0.29m

  3. 0.029m

  4. 2.9m
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When the tube is vertical, the pressure difference between the two air columns balances the weight of the mercury column. Using the ideal gas law and the change in volume, the displacement can be calculated.

Multiple choice physics pressure in fluids and atmospheric pressure common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

In troposphere, temperature varies linearly with elevation as $T=T _0-ay$, where $T _0$ is the temperature at the earth surface, then:

  1. the pressure does not change with elevation in troposphere

  2. the variation of pressure with elevation is linear

  3. the dimension of $a$ is $[M^0L^{-1}0]$

  4. the pressure is independent of variation with temperature in the given situation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Given T = T0 - ay, the dimension of 'a' must be temperature divided by length (K/L) to make the equation dimensionally consistent.

Multiple choice physics pressure in fluids and atmospheric pressure common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

A $2-m3$ weather balloon is loosely filled with helium at $1\ atm (76\ cm\ Hg)$ and at $27^{\circ}C$. At an elevation of $20,000\ ft$, the atmospheric pressure is down to $38\ cm\ Hg$ and the helium has expanded, being under no constraint from the confining bag. If the temperature at this elevation is $-48^{\circ}C$, the gas volume (in $m3)$ is

  1. $3$

  2. $4.28$

  3. $2$

  4. $2.5$
Reveal answer Fill a bubble to check yourself
C Correct answer
Multiple choice physics pressure in fluids and atmospheric pressure common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

The atmospheric pressure on a hill can be ___ $cm$ of mercury.

  1. $76$

  2. $70$

  3. $79$

  4. can't say
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pressure at the surface is $76 cm$ of mercury , Also as we up on a hill pressure decrease ,hence pressure will be less than $76 cm$ of mercury.

So the possible answer is $70 cm$ of mercury.

Multiple choice physics pressure in fluids and atmospheric pressure common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

How does pressure vary as we come from mountain top to sea level?

  1. Increases

  2. Decreases

  3. Remains same

  4. Depends on weather
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Answer is A.

For every meter we descend, the pressure per square meter increases by the weight of air per cubic meter at the height where we are.

Multiple choice physics pressure in fluids and atmospheric pressure common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

76 cm of mercury column exerts a pressure equal to that exerted by:

  1. 7920 m of air column

  2. 105 m of air column

  3. 1 cm of air column

  4. 1.29 m of air column
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

1 cm of mercury column exerts pressure=105 m of air column
76cm of mercury column exerts pressure =105 x 76 cm = 7980 m of air column

Multiple choice physics pressure in fluids and atmospheric pressure common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

______ m of air column ,on an average ,will exert as much pressure as 1 cm column of mercury.

  1. 100

  2. 1

  3. 20

  4. 105
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

We may write, 
Height of air column $\times$ Density of air $=$ Hight of mercury column $\times$ Density of mercury
Height of air column x $\displaystyle 1.29{ kg }/{ { m }^{ 3 } }=0.01m\times 13600{ kg }/{ { m }^{ 3 } }$
Height of air column =$\frac{136}{1.29}=105m$ (approx)

Multiple choice physics pressure in fluids and atmospheric pressure common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

It takes much longer to cook food in the hills than in the plains, because

  1. in the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than $100^oC$ causing an increase in cooking time

  2. due to low atmospheric pressure on the hills, the water boils at a temperature higher than $100^oC$ and therefore water takes longer to boil

  3. in the hills the atmospheric density is low and therefore a lot of heat is lost to the atmosphere

  4. in the hills the humidity is high and therefore a lot of heat is absorbed by the atmosphere leaving very little heat for cooking
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Since decrease in air pressure causes decrease in boiling temperature, because of which it takes more time to cook at hilly areas or high altitudes.

Multiple choice physics pressure in fluids and atmospheric pressure common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

Water boils at a lower temperature than $100^o$C on a hill station, because.

  1. Pressure is lower at high altitudes

  2. Temperature is lower at high altitudes

  3. Water vapours are less at high altitudes

  4. There is cloud formation at high altitudes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pressure decreases as we go up due to which boiling point also decreases. So water boils at a lower temperature than $100^{\circ C}$ on hill station.