💧 Fluid Mechanics and Hydraulics MCQs with Live Score

Practice Fluid Mechanics and Hydraulics MCQs with answers and detailed explanations

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Question 1: In fluid mechanics, what is the SI unit used to measure pressure?

Question 2: In practical fluid systems, how is absolute pressure defined mathematically?

Question 3: In fluid property analysis, how is specific gravity of a liquid defined?

Question 4: In compressibility studies of fluids, bulk modulus primarily represents which property?

Question 5: In fluid flow measurement, dynamic viscosity is expressed in which SI unit?

Question 6: In fluid mechanics, kinematic viscosity is defined as which ratio?

Question 7: In flow analysis, Reynolds number is used to represent which ratio of forces?

Question 8: Under what condition of Reynolds number does laminar flow occur in a pipe?

Question 9: In pipe flow classification, turbulent flow occurs when Reynolds number exceeds which value?

Question 10: Bernoulli’s equation is valid for which type of idealized fluid flow conditions?

Question 11: The continuity equation in fluid mechanics is based on conservation of which quantity?

Question 12: In fluid flow systems, discharge is measured in which SI unit?

Question 13: Surface tension in liquids primarily arises due to which molecular interaction?

Question 14: Capillary rise phenomenon in fluids is directly proportional to which parameter?

Question 15: The SI unit used to measure surface tension in fluids is:

Question 16: In a venturimeter used in pipelines, what physical quantity is primarily measured using pressure difference?

Question 17: A Pitot tube is used in fluid mechanics to determine which parameter of flowing fluid?

Question 18: In pipe flow analysis, what does the hydraulic gradient line (HGL) represent?

Question 19: In energy analysis of pipelines, how is the energy grade line positioned relative to HGL?

Question 20: Head loss due to friction in pipe flow is calculated using which equation?

Question 21: In fluid statics, the specific weight of a fluid is mathematically expressed using which relation?

Question 22: In a hydraulic press system, what pressure is generated when 200 N force acts on 0.02 m² area?

Question 23: Which assumption is not valid while defining an ideal fluid in theoretical fluid mechanics?

Question 24: If density of a fluid doubles while gravity remains constant, how will its specific weight change?

Question 25: In fluid kinematics, what is the defining characteristic of a streamline in a flow field?

Question 26: Under what condition do streamlines, pathlines, and streaklines coincide in fluid flow?

Question 27: For a flow to be considered steady at a point, which condition must be satisfied?

Question 28: A fluid flow is termed irrotational when which condition regarding vorticity is satisfied?

Question 29: Euler’s equation for inviscid flow neglects which type of force during derivation?

Question 30: Velocity of fluid particles in flow is measured using which SI unit?

Question 31: In a spatially uniform flow field, which condition applies to velocity gradients?

Question 32: A flow is steady but non-uniform when which condition holds true?

Question 33: Fluids whose density varies with pressure and temperature are classified as what type?

Question 34: If density increases in a fluid, how does its specific volume change?

Question 35: Liquids are generally considered incompressible because their compressibility is:

Question 36: When atmospheric pressure is included in hydrostatic pressure calculation, what type of pressure is obtained?

Question 37: The center of buoyancy shifts when which condition changes in a submerged body?

Question 38: According to Archimedes principle, floating condition is satisfied when:

Question 39: A floating body is stable when which condition is satisfied?

Question 40: Negative metacentric height indicates which type of equilibrium?

Question 41: When GM is negative, what happens to the floating body?

Question 42: One Newton force produces what effect on a 1 kg mass?

Question 43: In a flow net, streamlines and equipotential lines intersect at what angle?

Question 44: Cavitation occurs in fluid flow when pressure drops below:

Question 45: Mach number represents which ratio in compressible flow?

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Question 47: Supersonic flow occurs under which Mach number condition?

Question 48: One Joule is equal to which mechanical work unit?

Question 49: Hydraulic efficiency is defined as ratio of:

Question 50: The SI unit of power is:

Question 51: Head loss in Darcy equation is proportional to which factors?

Question 52: In laminar flow, friction factor is independent of:

Question 53: Doubling Reynolds number in laminar flow changes friction factor how?

Question 54: Boundary layer transition occurs approximately at which Reynolds number?

Question 55: Boundary layer thickness increases with:

Question 56: Boundary layer separation occurs due to:

Question 57: Newton’s law of viscosity relates shear stress with:

Question 58: A fluid at rest cannot sustain shear stress because:

Question 59: Hagen–Poiseuille equation shows discharge depends on:

Question 60: Flow separation results in increase of which force on body?

Question 61: In fluid dynamics, how does drag force vary with velocity according to drag equation?

Question 62: Lift force acting on an airfoil is mainly due to which physical phenomenon?

Question 63: Coefficient of drag depends mainly on which parameters in fluid flow?

Question 64: Terminal velocity of a falling body occurs when which condition is satisfied?

Question 65: Stoke’s law is applicable under which flow condition?

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Question 67: Froude number represents ratio of which forces in open channel flow?

Question 68: Critical flow in open channel occurs at what Froude number?

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Question 70: Supercritical flow exists when Froude number is:

Question 71: Hydraulic jump results in which change in flow properties?

Question 72: Manning equation shows velocity depends on which parameters?

Question 73: Chezy coefficient depends mainly on:

Question 74: Hydraulic radius is defined as:

Question 75: Hydraulic radius relation is:

Question 76: Discharge through an orifice varies with head as:

Question 77: Coefficient of discharge is product of which coefficients?

Question 78: If Cv is nearly unity, it indicates:

Question 79: Vena contracta is point where:

Question 80: Vena contracta represents:

Question 81: Time to empty tank depends on:

Question 82: Notch discharge depends mainly on:

Question 83: Rectangular notch discharge varies as:

Question 84: V-notch discharge sensitivity is higher because:

Question 85: Venturimeter efficiency is high due to:

Question 86: Head loss depends most strongly on:

Question 87: Minor losses depend mainly on:

Question 88: Water hammer occurs due to:

Question 89: Wave speed depends on:

Question 90: Hydraulic turbine converts energy from:

Question 91: In impulse turbine, pressure across runner is:

Question 92: Reaction turbine operates under:

Question 93: Specific speed helps in:

Question 94: Cavitation prevention method is:

Question 95: Pump converts energy from:

Question 96: Reciprocating pump is positive displacement because:

Question 97: Centrifugal pump works by:

Question 98: Priming is necessary because:

Question 99: Cavitation in pump causes:

Question 100: Pump efficiency is ratio of:

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