Tag: pressure in fluids

Questions Related to pressure in fluids

Pressure inside an inflated balloon is

physics forces and matter pressure in fluids pressure in liquids introduction to pressure

  1. Less than atmospheric pressure

  2. Greater than atmospheric pressure

  3. Equal to atmospheric pressure

  4. May be less than or equal to atmospheric pressure

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Correct Option: C

The pressure in an enclosed fluid is transmitted _________ in all directions with diminished force

physics forces and matter pressure in fluids pressure in liquids introduction to pressure

  1. equally

  2. unequally

  3. cant say

  4. none

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Correct Option: A
Explanation:
According to Pascal's law: Pressure in an enclosed fluid is transmitted equally in all direction with diminished force at all the points with same depth. 

Different liquids exert the _____ pressure at a given depth. 

physics forces and matter pressure in fluids pressure in liquids introduction to pressure

  1. same

  2. different

  3. can't say

  4. none

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Correct Option: B
Explanation:

Different liquids will exert the different pressure at a given depth because of difference in their density.

Liquid rise in a syringe when its piston is pulled up due to 

physics forces and matter pressure in fluids pressure in liquids introduction to pressure

  1. Atmospheric pressure

  2. Inertia of motion

  3. Inertia of rest

  4. Conservation of momentum

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Correct Option: A
Explanation:

When the piston is pulled up, air pressure inside syringe reduces because of increase in volume. While pressure outside syringe is more than that. So, it pushes liquid into syringe.

Based on which of the following does a water pump draw water?

physics forces and matter pressure in fluids pressure in liquids introduction to pressure

  1. Pressure difference

  2. Bernoulli's principle 

  3. Law of Gravity

  4. None of these

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Correct Option: A
Explanation:

Water pump reduses the pressure at one end of the pipe and pressure difference drives the water to come up from well.

What is the relationship between liquid pressure and the depth of a liquid?

physics forces and matter pressure in fluids pressure in liquids introduction to pressure

  1. Directly proportional

  2. Inversely proportional

  3. Linear

  4. None of these

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Correct Option: A
Explanation:

The relationship between liquid pressure and the depth of a liquid:

Pressure at depth 'h' = density of fluid $\times $ acceleration due to gravity 'g' $\times $  depth 'h'.
Pressure is directly proportional to depth. If we triple the depth, we triple the pressure.

The pressure a liquids exerts against the sides and bottom of a container depends on the 

physics forces and matter pressure in fluids pressure in liquids introduction to pressure

  1. atmospheric pressure

  2. surface area

  3. volume of container

  4. density and depth of liquid

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Correct Option: D
Explanation:

$\because p = h\times d\times g$
where, p = pressure, h = depth (height), d = density,  g = acceleration due to gravity = constant.

So, pressure depends on density and depth of liquid.

A tank $5\ m$ high is half filled with water and then is filled to the top with oil of density $0.85\ g\ cm^{-3}$. The pressure at the bottom of the tank, due to these liquids, is

physics forces and matter pressure in fluids pressure in liquids introduction to pressure

  1. $1.85\ g$

  2. $89.25\ g\ dyne\ cm^{-3}$

  3. $462.5\ g\ dyne\ cm^{-2}$

  4. $500\ g\ dyne\ cm^{-2}$

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Correct Option: C
Explanation:

We know that the pressure increases as we go deep into a liquid. The relation is given by $\Delta P = \rho g\Delta h$


Given that the tank is half filled with water and half with oil.
Thus, $h _\textrm{oil} = 2.5\textrm{ m}$ and $h _\textrm{water} = 2.5\textrm{ m}$

Thus, pressure at the bottom of the tank is $\Delta P = \Delta P _\textrm{oil} + \Delta P _\textrm{water} = 0.85\times 250g + 1\times 250g=462.5g \textrm{ dyne cm}^{-2}$

A barometer which measures atmospheric pressure more accurately is ..........

physics fluids pressure in fluids pressure in liquids introduction to pressure

  1. Fortin's barometer

  2. mercury barometer

  3. anaeroid barometer

  4. Torricelli barometer

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Correct Option: B
Explanation:

A barometer which measures atmospheric pressure most accurately is mercury barometer.

Hence, option B is correct.

The Pressure at any point in the liquid is proportional to :

physics pressure pressure in fluids pressure in liquids introduction to pressure

  1. The density of liquid.

  2. The depth of point below the surface.

  3. The acceleration due to gravity.

  4. All the above

Show answer
Correct Option: D
Explanation:

Pressure at any point in the liquid $(P)=hdg$
i.e., $P\alpha h$
(depth of point below the surface)
$\alpha d$ (density of liquid)
$\alpha g$ (acceleration due to gravity)