Tag: pressure in fluids and atmospheric pressure

Quizzes (8) Questions (120)

Questions Related to pressure in fluids and atmospheric pressure

Multiple choice physics pressure in fluids and atmospheric pressure hydraulic equipment applications of pascals law examples of hydraulic press
State True or False.
Hydraulic press is used in the extraction of oil from oil seeds.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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.

  1. $-0.32 \%$
  2. $-1.32 \%$
  3. $-0.42 \%$
  4. $-1.42 \%$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The bulk modulus B is defined as B = -delta_p / (delta_V / V). Rearranging gives delta_V / V = -delta_p / B. Plugging in values: -(1.6 * 10^7) / (5.0 * 10^9) = -0.0032, which is -0.32%.

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

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

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

Why nose bleed when we go at high attitudes:

  1. because of decrease in temperature.

  2. because of decrease in air pressure.

  3. because of change in composition of air.

  4. all
Reveal answer Fill a bubble to check yourself
B Correct answer
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

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

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

  1. increases

  2. decreases

  3. remain constant

  4. none
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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

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

  1. i only

  2. ii only

  3. Both

  4. None
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

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

  1. increase

  2. decrease

  3. remain the same

  4. depends on the type of activity
Reveal answer Fill a bubble to check yourself
A Correct answer
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.