Tag: pressure in fluids and atmospheric pressure

Questions Related to pressure in fluids and atmospheric pressure

State True or False.
Hydraulic press is used in the extraction of oil from oil seeds.

physics pressure in fluids and atmospheric pressure hydraulic equipment applications of pascals law examples of hydraulic press

  1. True

  2. False

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Correct Option: A
Explanation:

Hydraulic press is used in extraction of oil from oil seeds by crushing.

The concept of the hydraulic press is based on Pascal's theory, which states that when pressure is applied on fluids in an enclosed system, the pressure throughout the system always remains constant. In simple words, a hydraulic press is a machine that makes use of the pressure exerted on the fluids to crush something.

A hydraulic press contains 0.25 $m^3$ (250 L) of oil. Find the decrease in volume of the oil when it is subjected to a pressure increase $\Delta p \, = \, 1.6 \, \times \, 10^7$ ,Pa. The bulk modulus of the oil is $B \, = \, 5.0 \, \times \,10^9$ Pa.

physics pressure in fluids and atmospheric pressure hydraulic equipment applications of pascals law examples of hydraulic press

  1. $-0.32 \%$ 

  2. $-1.32 \%$ 

  3. $-0.42 \%$ 

  4. $-1.42 \%$ 

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Correct Option: A

As the vertical height from mean sea level increases, the atmospheric pressure decreases.

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:

With increase in vertical height, the atmospheric pressure falls. Fall in pressure means that the temperature also falls. This is because pressure is directly proportional to Temperature and vice versa.

How does atmospheric pressure change with the change in 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. pressure increases

  2. pressure decreases

  3. pressure remains same

  4. cant say

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Correct Option: B
Explanation:

Pressure decreases with the increase in altitude.

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.