Tag: physics

Questions Related to physics

The atmospheric pressure at sea level is :

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

  1. 0.76 cm of Hg column

  2. 76 m of Hg column

  3. 76 cm of Hg column

  4. 76 cm of water column

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Correct Option: C
Explanation:

atospheric pressure=760 mm of hg=76 cm of hg

A hydrogen-filled balloon expands as it rises and may even burst after rising very high in the atmosphere. This happens because

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

  1. The temperature increases with height

  2. The temperature decreases with height

  3. The atmospheric pressure increases with height

  4. The atmospheric pressure decreases with height

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Correct Option: D
Explanation:

The atmospheric pressure exists due to weight of atmospheric gases above a certain given height. As one goes high, the weight of atmosphere above decreases and so does the pressure. Thus for a balloon filled on ground, the pressure inside the balloon exceeds that outside and thus it bursts.

Why nose bleed when we go at high attitudes:

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

  1. because of decrease in temperature.

  2. because of decrease in air pressure.

  3. because of change in composition of air.

  4. all

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Correct Option: B
Explanation:

Air pressure decreases at high altitudes because the density of air decreases. It may cause the nose to bleed, especially if the individual has high blood pressure

Atmospheric pressure .................... with altitude

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

  2. decreases

  3. remain constant

  4. none

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Correct Option: B
Explanation:

Atmospheric pressure decreases with altitude due to decrease in height of the air column, which causes a linear decrease in atmospheric pressure

Consider the following statements and identify the right ones.
I)Air pressure decreases when air descends.
ii) Air pressure at sea level is lower than at the mountain top.

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

  1. i only

  2. ii only

  3. Both

  4. None

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Correct Option: D
Explanation:

Air pressure increases when air descends and air pressure at sea level is more than at the mountain top, thus option D is correct.

What will happen to submaximal heart rate during exercise at altitude for any given level of submaximal oxygen consumption when compared to sea level?

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

  1. increase

  2. decrease

  3. remain the same

  4. depends on the type of activity

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Correct Option: A
Explanation:

Since at high altitude oxygen concentration is less in compare to that at sea level hence rate of ${ O } _{ 2 }$ consumption increases leading to increase in heart rate.

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.

Show answer
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.