Tag: pressure in liquids and gases

Quizzes (11) Questions (110)

Questions Related to pressure in liquids and gases

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

The atmospheric pressure and height of barometer column is $10^5 P _a$ and 760mm respectively on the earth surface. If the barometer is taken to moon then column height will be

  1. zero

  2. 76 mm

  3. 126.6 mm

  4. 760 mm
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Since there is no atmosphere on moon, no atmospheric pressure will be there and hence corresponding to 0 pressure, height of mercury column will be 0.


Answer is option A.

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

Fill in blanks. 
Atmosphere pressure _________ with increase in altitude 

  1. increases

  2. decreases

  3. remains same

  4. cannot be determined
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pressure with Height: pressure decreases with increasing altitude. The pressure at any level in the atmosphere may be interpreted as the total weight of the air above a unit area at any elevation. At higher elevations, there are fewer air molecules above a given surface than a similar surface at lower levels. For example, there are fewer molecules above the 50 km surface that are found above the 12 km surface, which is why the pressure is less at 50 km.

Hence, Atmosphere pressure decrease with an increase in altitude 

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

By blowing between two balloons hanging close to each other you observe that they come closer. A similar phenomenon is seen in

  1. The lifting of an aeroplane

  2. Kite flying

  3. The lifting of balloon filled with

  4. Take off of rocket
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Due to present difference.

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

The density of the atmosphere at sea level is 1.29 $kg/m^{2}$. assume that it does not change with altitude. then how high would the atmosphere extend?

  1. 3 km

  2. 7 km

  3. 8 km

  4. 9 km
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
We know that $p=pgh$
p is atmospheric pressure, g in acceration due to gravity
$p = 1.29 kg/m^{2} ; p-=1.013\times 10\, N/m$
$\therefore h=\dfrac{p}{pg}=\dfrac{1.013\times 10^{5}}{1.29\times 9.8}$  $= 8013 \,km$
hence atmospheric extended 8013 km high from the sea level
Multiple choice physics pressure in liquids and gases common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

we do not get crushed by the atmospheric pressure as the out internal pressure and the atmospheric pressure are?

  1. equal

  2. greater

  3. lower

  4. none of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

We don't get crushed by atmospheric pressure (about 1 kg per square cm) because our internal body pressure is equal to the atmospheric pressure. This balance of pressures prevents our bodies from collapsing. If there were a significant pressure difference, it would cause serious damage - like when divers get the bends from rapid pressure changes.

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

The pressure P of a gas and its mean translational KE per unit volume are related as:

  1. $P=\dfrac{1}{2}E$

  2. $P=E$

  3. $P=\dfrac{3}{2}E$

  4. $P=(\dfrac{2}{3})E$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$\begin{array}{l} \therefore \, \, { V _{ rms } }=\sqrt { \dfrac { { 3PV } }{ M }  }  \ E=\dfrac { 1 }{ 2 } M\, \, { V _{ rms } }^{ 2 }=\dfrac { 3 }{ 2 } PV=\dfrac { 3 }{ 2 } P\, \, \left[ { \therefore \, \, V=1 } \right]  \end{array}$

Ans. (C)