Laminar Flow PYQs, GPSC Civil Engineering Previous Year

Surface roughness

A) hastens the transition of flow from laminar to turbulent

B) retards the transition of flow from laminar to turbulent

C) impedes the flow

D) reduces the discharge

A) hastens the transition of flow from laminar to turbulent


The Darcy law relating to mean velocity and hydraulic gradient in a porous medium is applicable to

A) laminar regime flow only

B) transition regime flow only

C) turbulent regime flow only

D) flow of all fluids in all regimes of flow

A) laminar regime flow only


If Reynold’s number is less than 1, then

A) Viscous forces are very strong as compared to inertial forces

B) Viscous forces are very weak as compared to inertial forces

C) Viscous forces are equal to inertial forces

D) Flow is turbulent in saturated soils

A) Viscous forces are very strong as compared to inertial forces


Hagen-Poiseuille equation deals with

A) Laminar Flow

B) Transitional Flow

C) Turbulent Flow

D) Boundary Layer

A) Laminar Flow


For laminar flow in a pipe, the energy correction factor is

A) 1.03

B) 1.33

C) 2.00

D) 2.50

C) 2.00


In a laminar flow between two parallel plates, the approximate ratio between average velocity and maximum velocity would be

A) 0.66

B) 1.50

C) 0.75

D) 1.33

A) 0.66


The momentum correction factor ‘β’ is used in account for

A) Change in direction of flow

B) Change in total energy

C) Non-uniform distribution of velocities at inlet and outlet section

D) Change in mass rate of flow

C) Non-uniform distribution of velocities at inlet and outlet section


In laminar flow through a round tube, the discharge varies

A) linearly as viscosity

B) inversely as viscosity

C) linearly as the radius

D) inversely as the pressure drop

B) inversely as viscosity


For laminar flow between parallel plates separated by a discharge of 2h, head loss varies

A) directly as h

B) inversely as h

C) directly as h2

D) inversely as h2

C) directly as h2


The velocity distribution in laminar flow through circular pipe follows

A) Logarithmic profile

B) Linear profile

C) Parabolic profile

D) Constant velocity profile

C) Parabolic profile


Practice Test On Laminar Flow PYQs, Fluid Mechanics PYQs (Section 1-1)

GPSC Civil Engineering Previous Year Asked Questions

1 / 10

If Reynold's number is less than 1, then

2 / 10

For laminar flow between parallel plates separated by a discharge of 2h, head loss varies

3 / 10

Hagen-Poiseuille equation deals with

4 / 10

In a laminar flow between two parallel plates, the approximate ratio between average velocity and maximum velocity would be

5 / 10

The velocity distribution in laminar flow through circular pipe follows

6 / 10

The momentum correction factor ‘β’ is used in account for

7 / 10

The Darcy law relating to mean velocity and hydraulic gradient in a porous medium is applicable to

8 / 10

For laminar flow in a pipe, the energy correction factor is

9 / 10

In laminar flow through a round tube, the discharge varies

10 / 10

Surface roughness

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