Questions and answers for exam Preparation

MCQs

Total Questions : 3218 | Page 322 of 322 pages

Question 3211. Pick out the wrong statement?

The form drag is dependent upon the occurrence of a wake
The shear stress at any given cross-section of a pipe for steady flow (either laminar or turbulent) varies linearly as the radial distance
An ideal fluid is the one, which has negligible surface tension and obeys the Newton’s law of viscosity
Existence of the boundary layer in fluid flow is because of viscosity of the fluid

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Answer: Option C. -> An ideal fluid is the one, which has negligible surface tension and obeys the Newton’s law of viscosity
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 3212. Pick out the correct statement?

A forced vortex occurs when fluid rotates as a solid about an axis
In laminar flow, Newton’s law of viscosity does not apply
A free vortex occurs, when fluid rotates as a solid
In turbulent flow, there are neither cross-currents nor eddies

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Answer: Option A. -> A forced vortex occurs when fluid rotates as a solid about an axis
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 3213. Pick out the correct statement?

Human blood is a Newtonian fluid
A Newtonian fluid obeys Newton’s law of cooling
For a non-Newtonian fluid, a straight line passes through the origin in a plot between shear stress and shear gradient
Thin lubricating oil is an example of a non-Newtonian fluid

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Answer: Option B. -> A Newtonian fluid obeys Newton’s law of cooling
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 3214. Pick out the wrong statement about a streamline ?

It is always parallel to the main direction of the fluid flow
It is a line across which there is no flow and it is equivalent to a rigid boundary
Streamlines intersect at isolated point of zero velocity and infinite velocity
The fluid lying between any two streamlines can be considered to be in isolation and the streamline spacing varies inversely as the velocity

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Answer: Option A. -> It is always parallel to the main direction of the fluid flow
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 3215. Pick out the correct statement pertaining to Venturimeter ?

A Venturimeter with a fixed pressure drop discharges more, when the flow is vertically downward, than when the flow is vertically upward
The co-efficient of contraction of a Venturimeter is always unity
For a fixed pressure drop, the discharge of a gas through a Venturimeter is greater, when compressibility is taken into account, than when it is negle
None of these

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Answer: Option D. -> None of these
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 3216. Pick out the wrong statement?

A fluid mass is free from shearing forces, when it is made to rotate with a uniform velocity
Newton’s law of viscosity is not applicable to the turbulent flow of fluid with linear velocity distribution
Laminar flow of viscous liquids is involved in the lubrication of various types of bearings
Rise of water in capillary tubes reduces with the increasing diameter of capillary tubes

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Answer: Option B. -> Newton’s law of viscosity is not applicable to the turbulent flow of fluid with linear velocity distribution
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 3217. Pick out the wrong statement ?

Surface tension of a liquid is because of the difference in magnitude of adhesive & cohesive forces
A hydrometer used for the determination of specific gravities of liquids works on the principle of buoyant forces
In case of unsteady fluid flow, the velocity at any given point does not change with time
Turbulent fluid flow is characterised by the rapid fluctuation of instantaneous pressure & velocity at a point

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Answer: Option C. -> In case of unsteady fluid flow, the velocity at any given point does not change with time
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 3218. Pick out the wrong statement?