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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
What should be the height of a uniform liquid in a cylindrical container so that the lateral force equals the force on the Base?
(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 cube floats in a liquid with lower density than water, with some portion above the surface. What happens to the liquid level once the ice completely melts?
(a) The level rises
(b) The level drops
(c) The level remains unchanged
(d) First rises then falls
Option b – The level drops
If gravity did not exist, which property would a Fluid lack?
(a) Pressure
(b) Surface tension
(c) Viscosity
(d) Buoyancy (Archimedes’ principle)
Option d – Buoyancy (Archimedes’ principle)
As water flows from a tap down a streamline, what happens?
(a) Cross-sectional area reduces
(b) Cross-sectional area increases
(c) Flow speed remains unchanged
(d) Area stays constant
Option a – Cross-sectional area reduces
For a Fluid to exhibit turbulent flow, which condition is necessary?
(a) High Fluid density
(b) High velocity
(c) Reynolds number below 2000
(d) Both high density and velocity
Option d – Both high density and velocity
In laminar flow, what characterizes the velocity at a given point?
(a) It stays constant over time
(b) Direction may change, but not speed
(c) Speed may change, but direction stays same
(d) Both speed and direction vary
Option a – It stays constant over time
When water flows through a horizontal pipe and enters a narrow section, what occurs?
(a) Speed increases and pressure decreases
(b) Pressure increases and speed decreases
(c) Both pressure and speed increase
(d) Both speed and pressure decrease
Option a – Speed increases and pressure decreases
What happens when pressure is applied to a confined Fluid?
(a) It increases and spreads to all parts
(b) It reduces and acts on container walls
(c) It increases depending on Fluid Mass and is then transferred
(d) It is transmitted unchanged throughout the Fluid and container walls
Option d – It is transmitted unchanged throughout the Fluid and container walls
A partially submerged object floats in a liquid inside a freely falling elevator. What is the buoyant force on the object?
(a) Zero
(b) Equal to its weight in air
(c) Equal to the weight of displaced liquid
(d) Equal to the weight of the submerged part
Option a – Zero
For a floating object to remain in stable equilibrium, the center of buoyancy must be
(a) Vertically above the center of gravity
(b) Below the center of gravity
(c) Horizontally aligned with the center of gravity
(d) At any arbitrary position
Option a – Vertically above the center of gravity
A high-speed train passes a station platform. What happens to a person standing close to the edge?
(a) Gets pulled towards the train
(b) Gets pushed away
(c) Experiences no effect
(d) Is affected only if the train moves faster than sound
Option a – Gets pulled towards the train
What does Torricelli’s theorem help calculate?
(a) Speed of liquid escaping through an opening
(b) Fluid flow speed in a pipe
(c) Terminal velocity
(d) Critical speed
Option a – Speed of liquid escaping through an opening
What principle explains the lift of an aircraft?
(a) Torricelli’s law
(b) Bernoulli’s principle
(c) Law of universal Gravitation
(d) Conservation of momentum
Option b – Bernoulli’s principle
The speed of liquid flowing out from a tank’s bottom does not depend on
(a) Orifice size
(b) Liquid height
(c) Gravity
(d) Liquid density
Option a – Orifice size
Why don’t falling raindrops harm us or dig holes?
(a) They fall with constant acceleration
(b) Their acceleration varies
(c) They have non-uniform speed
(d) They fall with constant terminal velocity
Option b – Their acceleration varies
A liquid will not wet a Solid surface if the angle of contact is
(a) Zero
(b) Greater than 90°
(c) Less than 90°
(d) Exactly 90°
Option b – Greater than 90°
A man is sitting in a boat floating on a pond. If he drinks some pond water, what will happen to the water level?
(a) It will rise slightly
(b) It will decrease slightly
(c) It remains unchanged
(d) None of the above
Option c – It remains unchanged
An egg sinks in normal water but floats in salty water. Why?
(a) Salty water is less dense than regular water
(b) Both liquids have equal density
(c) Salty water is denser than regular water
(d) None of the above
Option c – Salty water is denser than regular water
Which of the following does not influence the pressure at the bottom of a liquid tank?
(a) Gravity
(b) Height of liquid column
(c) Area of the bottom surface
(d) Type of liquid used
Option c – Area of the bottom surface
Bernoulli’s principle is based on conservation of
(a) Mass
(b) Linear momentum
(c) energy
(d) Angular momentum
Option c – energy
The working of a paint sprayer relies on
(a) Bernoulli’s law
(b) Archimedes’ principle
(c) Boyle’s law
(d) Pascal’s law
Option a – Bernoulli’s law
When water moves through a pipe with a narrowed section, what is observed?
(a) Pressure increases at the narrow part
(b) Pressure is higher in the wider part
(c) Pressure stays the same throughout
(d) None of these
Option b – Pressure is higher in the wider part
When a liquid flows through a conical tube, what is true?
(a) High speed at both wide and narrow ends
(b) Low speed at wide end and high at narrow end
(c) Same speed at both ends in laminar flow
(d) Uniform speed throughout
Option b – Low speed at wide end and high at narrow end
Bernoulli’s equation is particularly relevant to which domain?
(a) Electric circuits
(b) Magnetism
(c) Liquid flow
(d) Photoelectric phenomena
Option c – Liquid flow
The Magnus effect is best related to
(a) Magnetic fields
(b) Electric fields
(c) Bernoulli’s theorem
(d) Electromagnetic induction
Option c – Bernoulli’s theorem
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