# Fluid Mechanics Mcqs

This set of Mechanical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “ Fluid Mechanics ”. These questions are chosen from a collection of most authoritative and best reference books on Mechanical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Fluid Mechanics comprehensively.

## 1. For hypersonic flow, the Mach number is___________________?

Unity

Greater than unity

Greater than 2

Greater than 4

Energy

Work

Mass

Length

## 3. The fluid forces considered in the Navier Stokes equation are__________________?

Gravity, pressure and viscous

Gravity, pressure and turbulent

Pressure, viscous and turbulent

Gravity, viscous and turbulent

## 4. For pipes, laminar flow occurs when Roynolds number is__________________?

Less than 2000

Between 2000 and 4000

More than 4000

Less than 4000

Maximum

Minimum

Zero

Non-zero finite

## 6. In a static fluid ___________________?

Resistance to shear stress is small

Fluid pressure is zero

Linear deformation is small

Only normal stresses can exist

## 7. An ideal flow of any fluid must fulfill the following____________________?

Newton’s law of motion

Newton’s law of viscosity

Pascal’ law

Continuity equation

## 8. Liquids_________________?

Cannot be compressed

Occupy definite volume

Are not affected by change in pressure and temperature

Are not viscous

None of the above

1

1000

100

101.9

Cohesion

Surface tension

Viscosity

1000 N/m3

10000 N/m3

9.81 xlO3 N/m3

9.81 xlO6N/m3

Cohesion

Viscosity

Surface tension

## 13. A perfect gas____________________?

Has constant viscosity

Has zero viscosity

Is in compressible

Is of theoretical interest

None of the above

## 14. A fluid in equilibrium can’t sustain____________________?

Tensile stress

Compressive stress

Shear stress

Bending stress

## 15. The bulk modulus of elasticity with increase in pressure__________________?

Increases

Decreases

Remains constant

Increases first up to certain limit and then decreases

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