Tag: introduction to pressure

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

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

  1. Atmospheric pressure

  2. Inertia of motion

  3. Inertia of rest

  4. Conservation of momentum
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. Directly proportional

  2. Inversely proportional

  3. Linear

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

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

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

  1. atmospheric pressure

  2. surface area

  3. volume of container

  4. density and depth of liquid
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

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

  1. $1.85\ g$
  2. $89.25\ g\ dyne\ cm^{-3}$
  3. $462.5\ g\ dyne\ cm^{-2}$
  4. $500\ g\ dyne\ cm^{-2}$
Reveal answer Fill a bubble to check yourself
C Correct answer
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 $\Delta P = \Delta P _\textrm{oil} + \Delta P _\textrm{water} = 0.85\times 250g + 1\times 250g=462.5g \textrm{ dyne cm}^{-2}$

Multiple choice physics fluids pressure in fluids pressure in liquids introduction to pressure

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

  1. Fortin's barometer

  2. mercury barometer

  3. anaeroid barometer

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

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

Hence, option B is correct.

Multiple choice physics pressure pressure in fluids pressure in liquids introduction to pressure

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

  1. The density of liquid.

  2. The depth of point below the surface.

  3. The acceleration due to gravity.

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

Multiple choice physics pressure pressure in fluids pressure in liquids introduction to pressure

Liquid pressure at a point in a liquid does not depend on the :

  1. Density of liquid

  2. Shape of the vessel in which the liquid is kept

  3. Depth of the point from the surface

  4. Acceleration due to gravity
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

pressure in a fluid = $\rho gh $ 

so clearly it is independent of the shape of the vessel in which the liquid is kept .
hence option (B) is correct .