681. In the low Reynolds number region, the drag force on a sphere is proportional to
V
V2
V4
V0.5
✅ The correct answer is option A.
Fluid Mechanics MCQs
682. Capillary tube method of viscosity measurement is based on the
Hagen-Poiseulle’s equation
Stoke’s law
Navier-stokes equation
None of these
✅ The correct answer is option A.
683. The ratio of wall drag to total drag in the Stoke’s law range is
0.5
1
1-Mar
2-Mar
✅ The correct answer is option D.
684. A pipe is defined as ‘hydraulically smooth’, if the friction factor
Is not a function of Reynolds number
For a given Reynolds number remains constant even on further smoothening of the pipe
Is zero irrespective of the Reynolds number
None of these
✅ The correct answer is option B.
685. Working of a __________ pump characterises mixed flow.
Turbine
Piston
Diaphragm
None of these
✅ The correct answer is option A.
686. The rate of shear versus the shear stress curves are time dependent for __________ fluid.
Thixotropic
Rheopectic
Both A and B
Neither A nor B
✅ The correct answer is option C.
687. 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 infintie velocity
The fluid lying between any two streamlines can be considered to be in isolation and the streamline spacing varies inversely as the velocity
✅ The correct answer is option A.
688. The flow of gas along a pipe in the direction of decreasing pressure causes decrease in its
Viscosity
Specific volume
Velocity
None of these
✅ The correct answer is option B.
689. Specific speed of a centrifugal pump depends upon the __________ head.
Suction
Delivery
Manometric
None of these
✅ The correct answer is option D.
690. Stoke’s law is valid, when NNRe,p is less than
2
100
2100
700
✅ The correct answer is option A.