Tag: common consequences of the atmospheric pressure

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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)

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

Find the ratio of a systolic blood pressure of $120$ (in mm of Hg) to atmospheric pressure. Standard atmospheric pressure is $1.01\times 10^{5}\ Pa$

  1. 0.16

  2. 1.6

  3. 16

  4. 160
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Systolic pressure is 120 mm Hg. Convert this to Pascals: P = h * d * g = 0.12 m * 13600 kg/m^3 * 9.8 m/s^2 = 15993.6 Pa. The ratio to standard atmospheric pressure (1.01 * 10^5 Pa) is 15993.6 / 101000, which is approximately 0.158, rounding to 0.16.

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

On heating water from $0^0 C$ to $100^0 C$ its volume 

  1. Increases at each $^0 C$

  2. First increase till $4^0 C$ and then decreases

  3. First decrease till $4^0 C$ and then increases

  4. Remains same
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Water exhibits anomalous expansion. Its density is maximum at 4 degrees Celsius, meaning its volume is minimum at that temperature. Thus, as it heats from 0 to 4 degrees, it contracts (volume decreases), and from 4 to 100 degrees, it expands (volume increases).