🆕 100+ Fluid Mechanics MCQ with Answers PDF (SSC JE & GATE 2026)

🆕 100+ Fluid Mechanics MCQ with Answers PDF (SSC JE & GATE 2026)

March 20, 2026 Leave a Reply
fluid mechanics mcq with answers pdf SSC JE & GATE 2026
fluid mechanics mcq with answers 2026
                                        

 

🟢 Introduction

Are you preparing for SSC JE, GATE, or other mechanical engineering exams?

In this article, you will find 30+ important Fluid Mechanics MCQs with answers that will help you strengthen your concepts and improve your exam preparation for 2026. These questions are selected based on previous exam patterns and important topics.


📘 Fluid Mechanics MCQ with Answers

Basic Concepts

Q1. What is the unit of viscosity?
A) Pascal
B) Newton
C) Pascal-second
D) Joule
👉 Answer: C) Pascal-second

Q2. Which fluid has the highest viscosity?
A) Water
B) Air
C) Oil
D) Petrol
👉 Answer: C) Oil

Q3. Reynolds number is used to determine?
A) Pressure
B) Flow type
C) Velocity
D) Density
👉 Answer: B) Flow type

Q4. Bernoulli’s equation is based on?
A) Energy conservation
B) Mass conservation
C) Momentum
D) Heat transfer
👉 Answer: A) Energy conservation

Q5. Laminar flow occurs at Reynolds number?
A) > 4000
B) < 2000
C) = 3000
D) > 10000
👉 Answer: B) < 2000

Q6. The unit of pressure is?
A) Pascal
B) Watt
C) Joule
D) Newton
👉 Answer: A) Pascal

Q7. Specific gravity is the ratio of?
A) Density to weight
B) Density of fluid to density of water
C) Volume to mass
D) Pressure to density
👉 Answer: B) Density of fluid to density of water

Q8. Which instrument measures pressure?
A) Venturimeter
B) Manometer
C) Rotameter
D) Pitot tube
👉 Answer: B) Manometer

Q9. Continuity equation represents?
A) Energy conservation
B) Mass conservation
C) Momentum
D) Pressure
👉 Answer: B) Mass conservation

Q10. Turbulent flow occurs when Reynolds number is?
A) < 2000
B) 2000–4000
C) > 4000
D) = 1000
👉 Answer: C) > 4000

Flow & Properties

Q11. Density is defined as?
A) Mass/Volume
B) Volume/Mass
C) Force/Area
D) Energy/Volume
👉 Answer: A) Mass/Volume

Q12. Kinematic viscosity is?
A) Dynamic viscosity/density
B) Density/viscosity
C) Pressure/velocity
D) Force/area
👉 Answer: A) Dynamic viscosity/density

Q13. SI unit of density is?
A) kg/m³
B) N/m²
C) Joule
D) Watt
👉 Answer: A) kg/m³

Q14. What is compressibility?
A) Change in volume with pressure
B) Change in pressure with volume
C) Change in density with temperature
D) None
👉 Answer: A) Change in volume with pressure

Q15. Ideal fluid has?
A) No viscosity
B) High density
C) High pressure
D) Zero velocity
👉 Answer: A) No viscosity

Pressure & Measurement

Q16. Absolute pressure is?
A) Atmospheric + gauge pressure
B) Gauge pressure only
C) Vacuum pressure
D) None
👉 Answer: A) Atmospheric + gauge pressure

Q17. Gauge pressure is measured with?
A) Barometer
B) Manometer
C) Thermometer
D) Hygrometer
👉 Answer: B) Manometer

Q18. Vacuum pressure is?
A) Above atmospheric
B) Below atmospheric
C) Equal atmospheric
D) Zero
👉 Answer: B) Below atmospheric

Q19. Pressure increases with?
A) Height
B) Depth
C) Temperature
D) Velocity
👉 Answer: B) Depth

Q20. Unit of specific weight is?
A) N/m³
B) kg/m³
C) Pascal
D) Joule
👉 Answer: A) N/m³

Flow Measurement

Q21. Venturimeter measures?
A) Pressure
B) Velocity
C) Flow rate
D) Density
👉 Answer: C) Flow rate

Q22. Pitot tube measures?
A) Pressure
B) Velocity
C) Flow rate
D) Temperature
👉 Answer: B) Velocity

Q23. Rotameter works on?
A) Variable area principle
B) Pressure principle
C) Velocity principle
D) Density principle
👉 Answer: A) Variable area principle

Q24. Discharge is?
A) Volume/time
B) Mass/time
C) Force/time
D) Energy/time
👉 Answer: A) Volume/time

Q25. Flow rate unit is?
A) m³/s
B) kg/s
C) N/s
D) J/s
👉 Answer: A) m³/s

Energy & Bernoulli

Q26. Bernoulli equation applies to?
A) Ideal fluid
B) Real fluid
C) Solid
D) Gas only
👉 Answer: A) Ideal fluid

Q27. Total energy includes?
A) Pressure energy
B) Kinetic energy
C) Potential energy
D) All
👉 Answer: D) All

Q28. Hydraulic grade line represents?
A) Pressure head
B) Velocity head
C) Total head
D) Energy loss
👉 Answer: A) Pressure head

Q29. Energy line is always?
A) Below HGL
B) Above HGL
C) Equal HGL
D) None
👉 Answer: B) Above HGL

Q30. Losses in pipe are due to?
A) Friction
B) Turbulence
C) Bends
D) All
👉 Answer: D) All

Miscellaneous

Q31. Surface tension is?
A) Force per length
B) Energy per volume
C) Force per area
D) Pressure
👉 Answer: A) Force per length

Q32. Capillarity is due to?
A) Viscosity
B) Surface tension
C) Density
D) Pressure
👉 Answer: B) Surface tension

Q33. Pascal’s law is related to?
A) Pressure transmission
B) Energy
C) Flow
D) Heat
👉 Answer: A) Pressure transmission

Q34. Flow in pipe is mostly?
A) Laminar
B) Turbulent
C) Uniform
D) Steady
👉 Answer: B) Turbulent

Q35. Cavitation occurs due to?
A) High pressure
B) Low pressure
C) High velocity
D) Low temperature
👉 Answer: B) Low pressure

Write for Us – Mechanical Engineering Guest Post Guidelines (2026)

Write for Us – Mechanical Engineering Guest Post Guidelines (2026)

March 14, 2026 1 Comment
Write for Us - Mechanical Engineering Guest Post on MechLearning

Write for Us – Mechanical Engineering Guest Post Guidelines (2026)

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