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Define Viscosity MCQ. We covered all the Define Viscosity MCQ in this post for free so that you can practice well for the exam.
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MCQ on Define Viscosity for NEET Students
How does water typically flow in a river?
(A) It flows at the same speed throughout.
(B) It moves slower in the center and faster near the banks.
(C) It flows faster in the center and slower near the banks.
(D) It speeds up from one bank to the other.
Option c – It flows faster in the center and slower near the banks.
A liquid flow is considered streamlined when the Reynold number is
(A) below 2000
(B) between 3000 and 4000
(C) from 2000 to 3000
(D) from 4000 to 5000
Option a – below 2000
Water flows through a pipe with varying radius. If the radius at the entry is four times that at the exit, what is the ratio of the flow speeds?
(A) 16 : 9
(B) 9 : 16
(C) 4 : 3
(D) 3 : 4
Option b – 9 : 16
In which direction does the viscous force act within a flowing fluid layer?
(A) Cannot be determined, as force in a fluid is a tensor
(B) Opposite to the layer’s movement
(C) Along the surface of the layer
(D) Along the direction of the layer
Option c – Along the surface of the layer
Assertion: Critical velocity differs from terminal velocity.
Reason: Terminal velocity is the constant speed reached by a body falling through a viscous medium.
(A) Both assertion and reason are true, and reason explains the assertion
(B) Both assertion and reason are true, but reason does not explain the assertion
(C) Assertion is true, reason is false
(D) Assertion is false, reason is true
Option b – Both assertion and reason are true, but reason does not explain the assertion
What principle explains the functioning of an atomizer?
(A) Bernoulli’s principle
(B) Boyle’s law
(C) Archimedes’ principle
(D) Newton’s law of motion
Option a – Bernoulli’s principle
Under which condition is Bernoulli’s equation applicable?
(A) Constant, viscous, incompressible, and temperature-dependent flow
(B) Variable, non-viscous, incompressible, and temperature-independent flow
(C) Constant, non-viscous, incompressible, and temperature-independent flow
(D) Variable, non-viscous, incompressible, and temperature-dependent flow
Option c – Constant, non-viscous, incompressible, and temperature-independent flow
A fluid moves through a pipe of length l and radius r with velocity v. If the radius increases to 3r, what is the new velocity?
(A) 3v
(B) v/9
(C) v/3
(D) 9v
Option b – v/9
Why does a spacecraft heat up while re-entering Earth’s atmosphere?
(A) Due to air’s surface tension
(B) Due to air’s viscosity
(C) Because of high oxygen levels at altitude
(D) Due to atmospheric temperature
Option b – Due to air’s viscosity
What is the viscosity of an ideal fluid?
(A) Zero
(B) Between 0.5 and 1
(C) Exactly 1
(D) Infinite
Option a – Zero
Water passes through a horizontal pipe with a constricted section. At the narrowest point, the water will exhibit
(A) Maximum speed and minimum pressure
(B) Maximum pressure and minimum speed
(C) Lowest speed and pressure
(D) Highest pressure and speed
Option a – Maximum speed and minimum pressure
In streamlined flow through a uniform pipe, how do the streamlines behave?
(A) Arranged in rectangular blocks
(B) Separated into flat layers
(C) Aligned parallel to the pipe’s axis
(D) Formed into circular paths
Option c – Aligned parallel to the pipe’s axis
Why do raindrops fall with limited speed?
(A) Due to buoyancy from air
(B) Because of surface tension
(C) Due to air’s viscous resistance
(D) Owing to wind currents
Option c – Due to air’s viscous resistance
In laminar flow, how does the velocity of fluid at a point behave?
(A) It remains constant over time
(B) It can change direction but not speed
(C) It varies in both speed and direction
(D) Speed changes but direction remains the same
Option a – It remains constant over time
A 2 mm radius drop moves at a terminal velocity of 30 cm/s. What is the terminal velocity of a 1 mm drop?
(A) 30 cm/s
(B) 22.5 cm/s
(C) 15 cm/s
(D) 7.5 cm/s
Option d – 7.5 cm/s
What remains unchanged in a Venturi meter?
(D) Both kinetic and potential energy
Two spheres with radii r and 3r fall through a viscous fluid at the same speed. What is the ratio of viscous forces acting on them?
(A) 1 : 9
(B) 1 : 3
(C) 9 : 1
(D) 3 : 1
Option b – 1 : 3
Which of the following is the correct statement about viscosity?
(A) Liquid viscosity decreases and gas viscosity increases with temperature
(B) Viscosity increases with temperature for both liquids and gases
(C) Viscosity decreases with temperature for both liquids and gases
(D) Liquid viscosity increases and gas viscosity decreases with temperature
Option a – Liquid viscosity decreases and gas viscosity increases with temperature
In laminar flow, what is the velocity of the liquid at the bottom layer?
(A) Zero
(B) Infinite
(C) Average of all layers
(D) Maximum
Option a – Zero
How is the coefficient of viscosity defined?
(A) Ratio of longitudinal stress to strain
(B) Shearing stress per unit length
(C) Ratio of shearing stress to rate of strain
(D) Strain per unit area
Option c – Ratio of shearing stress to rate of strain
A venturi meter determines pressure difference by measuring the difference in
(A) Height
(B) Temperature
(C) Flow velocity
(D) Volume
Option a – Height
Two containers with different base areas are filled with water to the same height. If one holds four times more water, what is the pressure ratio at the base?
(A) 16 : 1
(B) 8 : 1
(C) 4 : 1
(D) 1 : 1
Option d – 1 : 1
What is true about the viscosity of hot air compared to cold air?
(A) It is lower in hot air
(B) It is higher in hot air
(C) It remains the same
(D) It depends on external pressure
Option b – It is higher in hot air
A pipe has a main diameter of 2 cm and a constriction of 1.2 cm. If the speed in the wider part is 5 cm/s, what is the speed in the narrow section?
(A) 14.4 cm/s
(B) 28.8 cm/s
(C) 25 cm/s
(D) 30 cm/s
Option b – 28.8 cm/s
A small cylinder of 2 cm diameter is connected to a large one of 20 cm diameter. If 100 N is applied on the small piston, what force is exerted on the large one (fluid is incompressible)?
(A) 2,000 N
(B) 10,000 N
(C) 20,000 N
(D) 1,000 N
Option b – 10,000 N
Why do different fluid layers experience viscous force in a tube?
(A) Because momentum is transferred between layers
(B) Because energy is transferred between layers
(C) Due to equal molecular velocity
(D) Due to varying density in the tube
Option a – Because momentum is transferred between layers
As fluid flows in a tube, how does velocity change from the center to the walls?
(A) It increases outward
(B) Depends on tube length
(C) It decreases outward
(D) It remains constant
Option c – It decreases outward
What is the height of a column of liquid with density 3.4 g/cm³ under standard pressure if mercury rises to 76 cm?
(A) 270 cm
(B) 340 cm
(C) 304 cm
(D) 76 cm
Option c – 304 cm
In turbulent flow, the speed of molecules touching the tube walls is
(A) Zero
(B) Maximum
(C) Equal to critical speed
(D) Variable
Option d – Variable
A small metal ball of mass ‘m’ falls in a fluid reaching terminal velocity ‘v’. If a second identical ball of mass ‘8m’ is dropped, what will be its terminal velocity?
(A) v
(B) 2v
(C) 3v
(D) 6v
Option a – v
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