Tag: pressure in fluids and atmospheric pressure

Questions Related to pressure in fluids and atmospheric pressure

It has been shown that those who successfully deal with altitude have

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

  1. weak hypoxic ventilatory drives

  2. a lower arterial PO2.

  3. strong hypoxic ventilatory drives.

  4. the ability to hypoventilate.

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Correct Option: C
Explanation:

Those who successfully deal with altitude have strong hypoxic ventilatory drives.

Which of the following strategies would likely result in the optimal adaptations?

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

  1. Live at high altitude, train at low altitude.

  2. Live at low altitude, train at high altitude.

  3. Live and train at low altitude.

  4. Live and train at high altitude.

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Correct Option: A
Explanation:

The best conditions for an athlete to get adapted to is to live in less ${ O } _{ 2 }$ concentration region & train at high ${ O } _{ 2 }$ concentration region, i.e. live at high altitude & train at low altitude.

Which of the following is a physiological change that has been shown to occur as a result of exposure to extreme altitudes?

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

  1. increases in muscle fiber area

  2. increases in mitochondrial volume

  3. decreases in muscle fiber area

  4. both a and b

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Correct Option: C
Explanation:

When a person reside at high altitude where oxygen concentration is very less, then their muscle fibre area decreases for maximization of oxygen carrying capacity.


Training at high altitude for performances at sea level may not result in improved performance. Why?

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

  1. athletes may actually detrain at high altitude.

  2. going back to sea level results in decreased hemoglobin concentration.

  3. the higher air density at sea level offsets any improvements made at altitude

  4. all of these.

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Correct Option: A
Explanation:

Less Oxygen concentration at high altitudes may lead to detrain of athletes as compared to when the performance is at sea level.

Which of the following factors would help maintain body temperature in cold water?

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

  1. higher body fat stores.

  2. wearing layers of clothing.

  3. vigorous movement.

  4. All of above

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Correct Option: A
Explanation:

$Answer:-$ A

If you have higher body fat more fat will be burned and more and more calories of energy are produced inside body to maintain its normal temperature.

Which of the following statements is false?

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

  1. Atmospheric pressure decreases with increasing altitude.

  2. The air is less dense at high altitudes compared to sea level.

  3. The percentage of oxygen in the air decreases with increasing altitude.

  4. Each liter of air contains fewer molecules of gas at increasing altitude.

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Correct Option: C
Explanation:

The percentage of oxygen in the air decreases with increasing altitude.

State true or false.
Atmospheric pressure decreases with increase in height.

physics pressure in fluids and atmospheric 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: A
Explanation:

It is to be remembered that 

P = Po - Sgh;  here h is the height above the ground level.
Hence atmospheric pressure decreases with increase in height.

Which of the following pollutants does not affect lung function in normal adults but causes bronchoconstriction in asthmatics?

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

  1. ozone

  2. sulfur dioxide

  3. carbon monoxide

  4. None

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Correct Option: B
Explanation:

Sulfur dioxide does not affect lung function in normal adults but causes bronchoconstriction in asthmatics.

A narrow uniform glass  tube $80\ cm$ long and open at both ends is half immersed in mercury. Then, the top of the tube is closed and it is taken out of mercury. A column of mercury $22\ cm$ long then remains in the tube. What is the atmospheric pressure?

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

  1. $60\ cm$ of $Hg$

  2. $70.9\ cm$ of $Hg$

  3. $76\ cm$ of $Hg$

  4. $none$

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Correct Option: A

If the mean free path of a gas is $\lambda$ at one atmospheric pressure, then its value at 5 atmospheric pressure will be (temperature is assumed to be constant)

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

  1. $\lambda$

  2. $5\lambda$

  3. $\frac{3}{2} \lambda$

  4. $\frac{\lambda}{5}$

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Correct Option: C