Tag: pressure in fluids and atmospheric pressure

Questions Related to pressure in fluids and atmospheric pressure

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

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

  1. external

  2. internal

  3. air

  4. vaccuum

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Correct Option: B
Explanation:

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

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.

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

  1. Both are true

  2. Both are false

  3. (i) True

    (ii) False

  4. (i) False

    (ii) True

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Correct Option: A
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, $pressure\propto\dfrac{1}{area}$

Height of atmosphere is about ________ $km$.

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

  1. $3000$

  2. $300$

  3. $30$

  4. $30000$

Show answer
Correct Option: B
Explanation:
Earth is surrounded by an envelope of air which is called atmosphere. The height from Earth's surface upto which it is found is $300kms$

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?

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

  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

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Correct Option: A
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.

Air pressure at sea level is ________ of mercury.
physics pressure in fluids and atmospheric pressure pressure in air introduction to atmospheric pressure pressure exerted by air devices to measure pressure

  1. $6\,m$

  2. $0.36\,km$

  3. $60\,cm$

  4. $0.76\,m$

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Correct Option: D
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.

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

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

  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

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Correct Option: D
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.

Atmospheric pressure exerted on earth is due to the.

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

  1. Gravitational pull

  2. Revolution of earth

  3. Rotation of earth

  4. Uneven heating of earth

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Correct Option: A
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.

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  ${\rm{(}}{{\rm{K}} _{{\rm{cu}}}}{\rm{ = 0}}{\rm{.9 and }}{{\rm{K}} _{{\rm{tin}}}}{\rm{ = 0}}{\rm{.15cal/cm/s}}{{\rm{/}}^{\rm{0}}}{\rm{C and }}{{\rm{L}} _{{\rm{steam}}}}{\rm{ = 540cal/g)}}$

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

  1. 5000kg

  2. 1000kg

  3. 4000kg

  4. 200kg

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Correct Option: C

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.

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

  1. 540 cal

  2. 500 cal

  3. 40 cal

  4. 100 cal

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Correct Option: C

A partially inflated balloon expands fully when 

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

  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

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Correct Option: D