# FSC Physics MCQs Chapter 6 Class 11

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Physics Ch 6 Class 11 Fluid Dynamics

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If 500 cm3 of gas, having a pressure of 760 millimeters of mercury, is compressed into a volume of 300 cm3. If the temperature remains constant, the pressure of the gas will be, in millimeters of mercury, approximately:

NTS 2017
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terminal velocity of a water droplet is dependent on:

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An object having spherical shape of radius ‘r’ experiences a retarding force F from a fluid of coefficient of viscosity ‘η’ when moving through the fluid with speed ‘v’. What is the ratio of retarding force to speed?

UHS 2011
Physics
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Speed and Pressure relation of a fluid is given by:

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A thin horizontal plate of area 0.036 m2 is beneath the surface of a liquid of density 930 kg m−3. The force on one side of the plate due to the pressure of the liquid is 290 N. What is the depth of the plate beneath the surface of the liquid?

ETEA 2018
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When fluid is incompressible, it means:

NUMS 2018
Physics
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7 / 33

For the horizontal pipe, the fluid inside it is flowing horizontally then Bernoulli’s
equation can be written as

UHS 2014
Physics
Fluid Dynamics
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Stokes’ Law is given as:

UHS 2013
Physics
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Ideal fluid is:

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10 / 33

Density of blood is:

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Two sample of gases ‘1’ and ‘2’ are taken at same temperature and pressure
but the ratio of number of their volume is V1
:V2 = 2:3. What is the ratio of the
number of moles of the gas sample?

UHS 2015
Physics
Fluid Dynamics
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S.I. Unit of rate of flow of a fluid :

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How much more thumb pressure must a nurse use to administer an injection with a hypodermic needle of inside diameter 0.30 mm compared to one with inside diameter 0.60 mm? Assume that the two needles have the same length and that the volume flow rate is the same in both cases.

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Water is flowing in a streamline motion through a horizontal tube. The pressure at a point in the tube is P where the velocity of now is v. At another point, where the pressure is P/2, the velocity of flow is: (density of water=ρ)

NUMS 2014
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What is dimension of coefficient of viscosity?

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If the radii of two droplets are in the ratio 2:3, what will be the ratio of their Terminal velocities?

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If an object sinks in the water, then

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When the drag force is equal to the weight of the droplet, the droplet will fall with:

UHS 2011
Physics
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Stokes’ Law for steady motion in a fluid of infinite extent is given by:

UHS 2012
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A body moving on a fluid will experience:

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If the speed of efflux through a small hole in a large tank is 9.8 m/s. Find the height at the fluid above the hole:

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In a river flow of water is maximum at

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A small leak is developed in a large water storage tank. If the height of water above the leakage is 10 m, then find the speed of efflux through the leak:

UHS 2013
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The density of blood is:

UHS 2011
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25 / 33

Blood pressure of a healthy person is mm Hg.

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Flow speed of the fluid through a non-uniform pipe increases from 1 m/sec to 3 m/sec. If change in P.E. is zero, then pressure difference between two points will be: (density of the fluid = 1000 kg/m3)

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A maintenance crew is working on a section of a three-lane highway with only one lane open to traffic. This result is much slower traffic flow. The cars on this highway behave like:

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The product of cross-sectional area of the pipe and the fluid speed at any point along the pipe:

UHS 2013
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Root mean square velocity of a gas having pressure ‘P’ and density ‘ρ’ is given
by:

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30 / 33

The viscous drag on small spherical body (moving with slow speed v) is propotional to

ETEA 2019
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Mass flow per second of the fluid is given by:

UHS 2015
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If each particle of fluid is passing through the same point, what would be the flow?

NUMS 2016
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Equation of continuity is expressed as:

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