Fluid Mechanics – MCQs 50 Score: 0 Attempted: 0/50 Subscribe 1. The study of fluids at rest is called: (A) Fluid dynamics (B) Fluid statics (C) Hydraulics (D) Aerodynamics 2. The unit of pressure in SI system is: (A) Newton (B) Pascal (C) Joule (D) Watt 3. One Pascal is equal to: (A) 1 N/m (B) 1 N/m² (C) 1 Nm (D) 1 J/m³ 4. The density of water at 4°C is approximately: (A) 1000 kg/m³ (B) 900 kg/m³ (C) 1200 kg/m³ (D) 800 kg/m³ 5. Specific gravity is defined as the ratio of: (A) Weight of fluid to weight of air (B) Density of fluid to density of water (C) Mass of fluid to mass of water (D) Pressure to volume 6. Pressure at a point in a fluid at rest acts: (A) Vertically (B) Horizontally (C) In all directions equally (D) Only upward 7. The pressure due to a liquid column of height h is: (A) ρgh (B) ρ/h (C) h/ρg (D) g/h 8. Which law gives the transmission of pressure in a confined fluid? (A) Bernoulli’s principle (B) Pascal’s law (C) Archimedes’ principle (D) Boyle’s law 9. The upward force experienced by a body immersed in fluid is called: (A) Thrust (B) Lift (C) Buoyant force (D) Drag 10. The buoyant force is equal to the weight of: (A) Body (B) Displaced fluid (C) Fluid + Body (D) Container 11. Archimedes’ principle deals with: (A) Pressure transmission (B) Buoyancy (C) Fluid continuity (D) Compressibility 12. A body floats in a fluid when: (A) Density of body > density of fluid (B) Density of body < density of fluid (C) Density of body = 0 (D) Body weight is zero 13. The continuity equation is based on the principle of conservation of: (A) Mass (B) Momentum (C) Energy (D) Pressure 14. The Bernoulli equation is based on the principle of conservation of: (A) Mass (B) Momentum (C) Energy (D) Pressure 15. In Bernoulli’s equation, the three terms represent: (A) Pressure, velocity head, elevation head (B) Work, power, energy (C) Force, velocity, momentum (D) Density, viscosity, flow 16. The SI unit of viscosity is: (A) Pa·s (B) N/m² (C) m²/s (D) N·s 17. The ratio of dynamic viscosity to density is called: (A) Kinematic viscosity (B) Specific gravity (C) Momentum (D) Fluidity 18. The SI unit of kinematic viscosity is: (A) m/s (B) m²/s (C) N/m² (D) J/s 19. Flow in which velocity at a point remains constant with time is called: (A) Steady flow (B) Unsteady flow (C) Turbulent flow (D) Uniform flow 20. Flow in which fluid particles move along well-defined paths is called: (A) Steady (B) Uniform (C) Laminar (D) Turbulent 21. Laminar flow generally occurs at Reynolds number: (A) Re < 2000 (B) Re > 4000 (C) 2000 < Re < 4000 (D) Re = 1000 22. Turbulent flow occurs at Reynolds number: 23. The Reynolds number is given by: (A) ρVD/μ (B) μ/ρVD (C) V/ρμ (D) ρμ/V 24. A venturimeter is used to measure: (A) Pressure (B) Flow rate (C) Density (D) Viscosity 25. A pitot tube is used to measure: (A) Velocity of fluid (B) Pressure difference (C) Density (D) Discharge 26. The unit of discharge is: (A) m/s (B) m³/s (C) N/m² (D) J/s 27. The loss of head due to friction is given by: (A) Darcy–Weisbach equation (B) Bernoulli’s theorem (C) Archimedes’ principle (D) Continuity equation 28. The dimensionless number relating inertia force to viscous force is: (A) Froude number (B) Reynolds number (C) Weber number (D) Mach number 29. The Mach number is defined as the ratio of: (A) Velocity of fluid to velocity of sound (B) Velocity of fluid to velocity of light (C) Pressure to velocity (D) Density to velocity 30. Flow in open channels is mainly due to: (A) Pressure difference (B) Gravity (C) Pumping (D) Capillarity 31. The center of pressure of a plane surface immersed vertically in a liquid is located: (A) Above centroid (B) At centroid (C) Below centroid (D) At free surface 32. The pressure measured above atmospheric pressure is called: (A) Vacuum pressure (B) Gauge pressure (C) Absolute pressure (D) Negative pressure 33. Absolute pressure is equal to: (A) Gauge pressure + Atmospheric pressure (B) Gauge pressure – Atmospheric pressure (C) Gauge pressure × Atmospheric pressure (D) Gauge pressure / Atmospheric pressure 34. Capillarity in liquids is due to: (A) Cohesion only (B) Adhesion only (C) Surface tension (D) Buoyancy 35. The SI unit of surface tension is: (A) N/m (B) N/m² (C) J/m³ (D) J/m² 36. Manometers are used for measuring: (A) Flow velocity (B) Pressure difference (C) Discharge (D) Viscosity 37. A hydraulic press works on the principle of: (A) Bernoulli’s theorem (B) Archimedes’ principle (C) Pascal’s law (D) Newton’s law 38. Cavitation occurs when: (A) Pressure < vapor pressure (B) Pressure > atmospheric pressure (C) Flow velocity is very low (D) Viscosity is high 39. Which of the following is a dimensionless number? (A) Reynolds number (B) Weber number (C) Froude number (D) All of these 40. The ratio of inertia force to surface tension force is given by: (A) Reynolds number (B) Weber number (C) Froude number (D) Mach number 41. The Froude number is the ratio of: (A) Inertia force to viscous force (B) Inertia force to gravitational force (C) Pressure force to inertia force (D) Elastic force to viscous force 42. The term “slug” is a unit of: (A) Mass (B) Force (C) Velocity (D) Pressure 43. The continuity equation assumes the fluid is: (A) Compressible (B) Incompressible (C) Viscous (D) Rotating 44. Hydraulic jump is related to: (A) Pipe flow (B) Open channel flow (C) Compressible flow (D) Viscous flow 45. The pressure at a point below the free surface in a static fluid depends on: (A) Depth only (B) Depth and fluid density (C) Depth, fluid density, and gravity (D) Pressure of container 46. Which device is used to measure very small pressure differences? (A) U-tube manometer (B) Piezometer (C) Differential manometer (D) Inclined manometer 47. In a siphon, the liquid rises above the free surface in the container due to: (A) Suction pressure (B) Capillary action (C) Atmospheric pressure (D) Gravity 48. When velocity of fluid increases, pressure decreases. This is explained by: (A) Pascal’s law (B) Bernoulli’s principle (C) Archimedes’ principle (D) Continuity equation 49. The metacentric height is a measure of: (A) Stability of floating body (B) Buoyant force (C) Pressure force (D) Velocity head 50. A streamline and pathline are identical in: (A) Unsteady flow (B) Steady flow (C) Turbulent flow (D) Rotational flow FOUNDATIONAL SUBJECTS (Year 1 – Year 2)Engineering Mechanics (Statics & Dynamics) – MCQsFluid Mechanics – MCQsThermodynamics – MCQsComputer Programming (e.g., MATLAB, Python) – MCQsIntroduction to Engineering – MCQsGeology for Engineers – MCQsTechnical Communication – MCQs CORE PETROLEUM ENGINEERING SUBJECTS (Year 2 – Year 4)Introduction to Petroleum Engineering – MCQsPetroleum Geology – MCQsDrilling Engineering – MCQsReservoir Engineering – MCQsProduction Engineering – MCQsPetroleum Fluid Properties – MCQsWell Logging and Formation Evaluation – MCQsPetroleum Economics – MCQsPetroleum Refining and Processing – MCQs Natural Gas Engineering – MCQsEnhanced Oil Recovery (EOR) – MCQsWell Testing – MCQsReservoir Simulation – MCQsDrilling Fluids and Cementing – MCQsOffshore Petroleum Engineering – MCQsHealth, Safety and Environment (HSE) – MCQsPetroleum Project Management – MCQsCorrosion Engineering – MCQsArtificial Lift Techniques – MCQsPetrophysics – MCQs LABORATORIES & PRACTICALS (Theory-based MCQs can be made from these)Drilling Fluids Lab – MCQsCore Analysis Lab – MCQsReservoir Simulation Lab – MCQsRock and Fluid Properties Lab – MCQsWell Logging Lab – MCQs ELECTIVES (Optional/Advanced)Energy Transition and Sustainability – MCQsUnconventional Resources (Shale, Tight Gas, etc.) – MCQsData Analytics in Petroleum Engineering – MCQsGeographic Information Systems (GIS) – MCQsPetroleum Law and Policy – MCQsPipeline Engineering – MCQsRenewable Energy Integration – MCQs