Tag: physics

Questions Related to physics

Atmospheric pressure decreases with increase in height.

physics pressure in liquids and gases 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: A
Explanation:

Atmospheric pressure decreases with increase in height & pressure at a point at height h.

               P = Po - Sgh.

A given mass of gas occupies a volume $100 c.c$ at one atmosphere pressure and temperature of $100^oC$. Temperature being the same, the volume of the gas atmosphere pressure is

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

  1. $100 c.c$

  2. $400c.c$

  3. $25c.c$

  4. $200c.c$

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Correct Option: B

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?

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

  1. 3 km

  2. 7 km

  3. 8 km

  4. 9 km

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Correct Option: C
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

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

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

  1. equal

  2. greater

  3. lower

  4. none of the above

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Correct Option: A

Atmospheric pressure decreases with altitude.

physics pressure in liquids and gases 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: A

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

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

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

  2. $P=E$

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

  4. $P=(\dfrac{2}{3})E$

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Correct Option: C
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)

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

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

  1. 0.16

  2. 1.6

  3. 16

  4. 160

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Correct Option: A

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

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

  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

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Correct Option: C

The volume of a given amount of water ______ when its temperature is increased form $0^0 C$ to $4^0 C$.

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

  1. decreases

  2. remains the same

  3. increase

  4. first increases and then decreases.

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Correct Option: A

A air bubble rises from bottom of a lake to surface If its radius increases by 200% and atmospheric pressure is equal to water coloumn of height H. then depth of lake is 

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

  1. 21H

  2. 8H

  3. 9H

  4. 26H

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Correct Option: B