Fluid Flow MCQ. We covered all the Fluid Flow MCQ in this post for free so that you can practice well for the exam.
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MCQ on Fluid Flow for Students
To what height should a cylindrical vessel be filled with a homogeneous liquid to make the sides of the vessel equal to the force exerted by the liquid on the bottom of the vessel?
(a) Equal to the radius
(b) Less than the radius
(c) More than the radius
(d) Four times the radius
Option a – Equal to the radius
An ice block floats in a liquid whose density is less than water. A part of the block is outside the liquid. When the whole of the ice has melted, the liquid level will
(a) rise
(b) go down
(c) remain the same
(d) the first rise then go down
Option b – go down
If there were no gravity, which of the following will not be there for a fluid
(a) Pressure
(b) Surface tension
(c) Viscosity
(d) Archimedes’ principle
Option d – Archimedes’ principle
Water falls from a tap, down the stremline
(a) area decreases
(b) area increases
(c) velocity remains same
(d) area remains same
Option a – area decreases
For the flow of a fluid to be turbulent
(a) fluid should have high density
(b) velocity should be large
(c) Reynold’s number should be less than 2000
(d) both (a) and (b)
Option d – both (a) and (b)
In a streamline (laminar flow) the velocity of flow at any point in the liquid
(a) does not vary with time
(b) may vary in direction but not in magnitude
(c) may vary in magnitude but not in the direction
(d) may vary both in magnitude and direction
Option a – does not vary with time
Water is flowing through a horizontal pipe in a streamline flow. At the narrowest part of the pipe
(a) velocity is maximum and pressure is minimum
(b) pressure is maximum and velocity is minimum
(c) both the pressure and velocity are maximum
(d) both the velocity and pressure are minimum
Option a – velocity is maximum and pressure is minimum
Pressure applied to an enclosed fluid is
(a) increased and applied to every part of the fluid
(b) diminished and transmitted to the wall of the container
(c) increased in proportion to the mass of the fluid and then transmitted
(d) transmitted unchanged to every portion of the fluid and wall of containing vessel.
Option d – transmitted unchanged to every portion of the fluid and wall of containing vessel
A body partly immersed, floats in a liquid contained in a beaker. The beaker is kept inside a lift falling freely under gravity. The upthrust on the body due to liquid is
(a) zero
(b) equal to the weight of the body in the air
(c) equal to the weight of the liquid displaced
(d) equal to the weight of immersed part of the body
Option a – zero
In order that a floating object to be in a stable equilibrium, its centre of buoyancy should be
(a) vertically above its centre of gravity
(b) below its centre of gravity
(c) horizontally in a line with its centre of gravity
(d) maybe anywhere
Option a – vertically above its centre of gravity
A fast train goes past the wayside station platform at high speed. A person standing at the edge of the platform is
(a) attracted to the train
(b) repelled by train
(c) unaffected by the outgoing train
(d) affected only if the train’s speed is more than the speed of sound
Option a – attracted to the train
Toricelli’s theorem is used to find
(a) the velocity of efflux through an orifice.
(b) the velocity of flow of liquid through a pipe.
(c) terminal velocity
(d) critical velocity
Option a – the velocity of efflux through an orifice
The lift of an aeroplane is based on
(a) Torricelli’s theorem
(b) Bernoulli’s theorem
(c) Law of gravitation
(d) conservation of linear momentum
Option b – Bernoulli’s theorem
The velocity of efflux of a liquid through an orifice in the bottom of the tank does not depend upon
(a) size of orifice
(b) height of liquid
(c) acceleration due to gravity
(d) density of liquid
Option a – size of orifice
The raindrops falling from the sky neither injure us nor make holes in the ground because they move with
(a) constant acceleration
(b) variable acceleration
(c) variable speed
(d) constant terminal velocity
Option b – variable acceleration
A liquid does not wet the sides of a solid if the angle of contact is
(a) Zero
(b) Obtuse (more than 90°)
(c) Acute (less than 90°)
(d) 90° (right angle)
Option b – Obtuse (more than 90°)
A man is sitting in a boat which is floating in the pond. If the man drinks some water from the pond, the level of water in the pond will
(a) rise a little
(b) fall a little
(c) remain stationary
(d) none of these
Option c – remain stationary
An egg when placed in ordinary water sinks but floats when placed in brine. This is because the
(a) the density of brine is less than that of ordinary water
(b) the density of brine is equal to that of ordinary water
(c) the density of brine is greater than that of ordinary water
(d) None of these
Option c – the density of brine is greater than that of ordinary water
The pressure at the bottom of a tank containing a liquid does not depend on
(a) acceleration due to gravity
(b) height of the liquid column
(c) area of the bottom surface
(d) nature of the liquid
Option c – area of the bottom surface
In Bernoulli’s theorem which of the following is conserved?
(a) Mass
(b) Linear momentum
(c) Energy
(d) Angular momentum
Option c – Energy
Paint-gun is based on
(a) Bernoulli’s theorem
(b) Archimedes’ principle
(c) Boyle’s law
(d) Pascal’s law
Option a – Bernoulli’s theorem
Water is flowing through a horizontal pipe having a restriction, then
(a) pressure will be greater at the restriction.
(b) pressure will be greater in the wider portion.
(c) pressure will be the same throughout the length of the pipe.
(d) None of these
Option b – pressure will be greater in the wider portion
A liquid is allowed to flow into a tube of a truncated cone shape. Identify the correct statement from the following.
(a) The speed is high at the wider end and high at the narrow end.
(b) The speed is low at the wider end and high at the narrow end.
(c) The speed is the same at both ends in a streamlined flow.
(d) The liquid flows with uniform velocity in the tube.
Option b – The speed is low at the wider end and high at the narrow end
Bernoulli’s equation is important in the field of
(a) electrical circuits
(b) magnetism
(c) flow of liquids
(d) photoelectric effect
Option c – flow of liquids
Magnus effect is very near to the
(a) magnetic field
(b) electric field
(c) Bernoulli’s theorem
(d) magnetic effect of current
Option c – Bernoulli’s theorem
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