Tag: pressure in liquids and gases

Questions Related to pressure in liquids and gases

Find the ratio of a systolic blood pressure of $120$ (in mm of Hg) to atmospheric pressure. Standard atmospheric pressure is $1.01\times 10^{5}\ Pa$

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

  1. 0.16

  2. 1.6

  3. 16

  4. 160

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Correct Option: A

On heating water from $0^0 C$ to $100^0 C$ its volume 

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

  1. Increases at each $^0 C$

  2. First increase till $4^0 C$ and then decreases

  3. First decrease till $4^0 C$ and then increases

  4. Remains same

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Correct Option: C

The volume of a given amount of water ______ when its temperature is increased form $0^0 C$ to $4^0 C$.

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

  1. decreases

  2. remains the same

  3. increase

  4. first increases and then decreases.

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Correct Option: A

A air bubble rises from bottom of a lake to surface If its radius increases by 200% and atmospheric pressure is equal to water coloumn of height H. then depth of lake is 

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

  1. 21H

  2. 8H

  3. 9H

  4. 26H

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Correct Option: B

A large bottle is fitted with a capillary siphon. Ratio of times taken to empty the bottle when it is filled with (i) water (ii) petroleum of relative density 0.8.

$( _{water} = 0.001poise, _{petroleum} = 0.002 poise, d _{water} = 1000 kg/m^3)$

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

  1. 5/4

  2. 4/5

  3. 2/5

  4. 3/5

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Correct Option: C

Siphon will fail to work if

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

  1. the densities of the liquid in the two vessels are equal

  2. the level of the liquid in the two vessels are at the same height

  3. both its limbs are of unequal length

  4. the temperature of the liquids in the two vessels are the same

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Correct Option: B

A ${ 16cm }^{ 3 }$ volume of water flows per second through a capillary tube of radius r cm and of length 1 cm, when connected to a pressure head of h cm of water. If a tube of the same length and radius r/2 is connected to the same pressure head, find the mass of water flowing per minute through the tube 

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

  1. 80 gram/min

  2. 70 gram/min

  3. 60 gram/min

  4. 50 gram/min

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Correct Option: C

If it takes $5$ minutes to fill a 15 litre bucket  from a water tap of diameter $\frac{2}{\sqrt{\pi}}$ cm then the Reynolds number for the flow is (density of water = $10^3 kg/m^3$ and viscosity of water = $10^{-3}$Pa.s) close to

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

  1. $11,000$

  2. $550$

  3. $1100$

  4. $5500$

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Correct Option: D

Thrust is which type of force:

physics floatation pressure in liquids and gases pressure dependence on force and area concept of pressure

  1. Parallel

  2. Perpendicular

  3. normal

  4. Both b and c

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Correct Option: D
Explanation:

The force which is perpendicular to the surface on which it is acted is called a thrust.

A perpendicular force is also called 'normal' to that surface.
Hence correct answer is option D.

Which Newton's laws describe thrust?

physics floatation pressure in liquids and gases pressure dependence on force and area concept of pressure

  1. First and second

  2. second and third

  3. only second

  4. first and third

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Correct Option: B
Explanation:

Thrust is a reaction force described quantitatively by Newton's second and third laws. When a system expels or accelerates mass in one direction, the accelerated mass will cause a force of equal magnitude but opposite direction on that system.