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 pressure in air introduction to atmospheric pressure pressure exerted by air devices to measure pressure

Ink does not spill out of an ink dropper when the atmospheric pressure and ____ pressure are equal.

  1. external

  2. internal

  3. air

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

As the pressure inside the dropper, i.e, the internal pressure and the atmospheric pressure become equals,  ink does not spill out.

Multiple choice physics pressure in fluids and atmospheric pressure pressure in air introduction to atmospheric pressure pressure exerted by air devices to measure pressure

State whether the following statements are true or false?
(i) the pressure inside our body is equal to the atmospheric pressure
(ii) pressure is inversely proportional to the area.

  1. Both are true

  2. Both are false

  3. (i) True(ii) False

  4. (i) False(ii) True
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

(i) True, because we do not get crushed as the pressure inside and atmospheric pressure becomes equal.

(ii) True, as $pressure=\dfrac{force}{area}$. So, for constant force, $pressure\propto\dfrac{1}{area}$

Multiple choice physics pressure in fluids and atmospheric pressure pressure in air introduction to atmospheric pressure pressure exerted by air devices to measure pressure

While filling a syringe with liquid which of the following is true for pressure inside the barrel and the atmospheric pressure acting on the liquid?

  1. pressure inside the barrel is less than atmospheric pressure

  2. pressure inside the barrel is more than atmospheric pressure

  3. pressure inside the barrel is same as atmospheric pressure

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When the plunger is pulled up in the barrel, the pressure inside the barrel is much less than atmospheric pressure. As a result atmospheric pressure forces the liquid to rise up in the syringe.

Multiple choice physics pressure in fluids and atmospheric pressure pressure in air introduction to atmospheric pressure pressure exerted by air devices to measure pressure
Air pressure at sea level is ________ of mercury.
  1. $6\,m$
  2. $0.36\,km$
  3. $60\,cm$
  4. $0.76\,m$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When air pressure is measure at the sea level using a mercury barometer, the height upto which the mercury column rises is $76cm$.

Hence the atmospheric pressure at this level is also called $0.76m$ of mercury.

Multiple choice physics pressure in fluids and atmospheric pressure pressure in air introduction to atmospheric pressure pressure exerted by air devices to measure pressure

Which of the following are the common consequences of atmospheric pressure in our daily life.

  1. Sucking a drink with a straw

  2. Filling a syringe with a liquid

  3. Filling ink in a fountain pen

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Liquid flows from higher pressure region to the lower pressure region.

Thus sucking a drink with a straw, filling a syringe with a liquid and filling ink in a fountain pen are the consequences of atmospheric pressure.

Multiple choice physics pressure in fluids and atmospheric pressure pressure in air introduction to atmospheric pressure pressure exerted by air devices to measure pressure

Atmospheric pressure exerted on earth is due to the.

  1. Gravitational pull

  2. Revolution of earth

  3. Rotation of earth

  4. Uneven heating of earth
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The atmospheric pressure exerted on earth is due to gravitational pull of the earth and is about 14.7 psi.

Hence, option A is correct.

Multiple choice physics pressure in fluids and atmospheric pressure pressure in air introduction to atmospheric pressure pressure exerted by air devices to measure pressure

A boiler is made of a copper plate 2.4mm thick with an inside coating of a 0.2mm thick layer of tin.The surface area exposed to gases at ${\rm{70}}{{\rm{0}}^{\rm{0}}}{\rm{C is 400c}}{{\rm{m}}^{\rm{2}}}$ . The amount of steam that could be generated per hour at atmospheric pressure is  ${\rm{(}}{{\rm{K}} _{{\rm{cu}}}}{\rm{ = 0}}{\rm{.9 and }}{{\rm{K}} _{{\rm{tin}}}}{\rm{ = 0}}{\rm{.15cal/cm/s}}{{\rm{/}}^{\rm{0}}}{\rm{C and }}{{\rm{L}} _{{\rm{steam}}}}{\rm{ = 540cal/g)}}$

  1. 5000kg

  2. 1000kg

  3. 4000kg

  4. 200kg
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Heat transfer Q = (T1 - T2) / (d1/k1 + d2/k2) * Area * time. Using the provided thermal conductivities and thicknesses, one calculates the heat flow rate, then divides by the latent heat of steam (540 cal/g) to find the mass generated.

Multiple choice physics pressure in fluids and atmospheric pressure pressure in air introduction to atmospheric pressure pressure exerted by air devices to measure pressure

Icc of water at $ 100^o C $ is given 540 cal of heat and the steam formed accupies 167 Icc at the atmospheric pressure. Then workdone against atmospheric pressure in this process is nearly.

  1. 540 cal

  2. 500 cal

  3. 40 cal

  4. 100 cal
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Work done against atmospheric pressure is W = P * delta_V. Given P = 1 atm = 1.013 * 10^5 Pa and the change in volume (steam volume - water volume), the work is approximately 40 cal.

Multiple choice physics pressure in fluids and atmospheric pressure pressure in air introduction to atmospheric pressure pressure exerted by air devices to measure pressure

A partially inflated balloon expands fully when 

  1. It is put into warm water

  2. It is put into cold water

  3. It is into water at room temperature

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

According to Charles's Law, volume is directly proportional to temperature. When a partially inflated balloon is placed into warm water, the air inside heats up, expands, and causes the balloon to expand fully. Cold water would cause the air to contract.