Hydraulics And Fluid Mechanics Set 10

Civil Engineering

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This set of Hydraulics and Fluid Mechanics Multiple Choice Questions & Answers (MCQs) focuses on Hydraulics And Fluid Mechanics Set 10

Q1 | A weir is said to be broad crested weir, if the width of the crest of the weir is ________ half the height of water above the weir crest.
  • Equal to
  • Less than
  • More than
  • None of these
Answer: More than
Q2 | The bulk modulus of elasticity
  • Has the dimensions of 1/pressure
  • Increases with pressure
  • Is large when fluid is more compressible
  • Is independent of pressure and viscosity
Answer: Increases with pressure
Q3 | Kinematic viscosity is equal to
  • Dynamic viscosity/density
  • Dynamic viscosity × density
  • Density/dynamic viscosity
  • 1/dynamic viscosity × density
Answer: Dynamic viscosity/density
Q4 | The atmospheric pressure at sea level is
  • 103 kN/m2
  • 10.3 m of water
  • 760 mm of mercury
  • All of these
Answer: All of these
Q5 | The conditions for the stable equilibrium of a floating body are
  • The metacentre should lie above the center of gravity
  • The center of buoyancy and the center of gravity must lie on the same vertical line
  • A righting couple should be formed
  • All the above are correct
Answer: All the above are correct
Q6 | A glass tube of smaller diameter is used while performing an experiment for the capillary rise of water because
  • It is easier to see through the glass tube
  • Glass tube is cheaper than a metallic tube
  • It is not possible to conduct this experiment with any other tube
  • All of the above
Answer: It is easier to see through the glass tube
Q7 | To avoid an interruption in the flow of a siphon, an air vessel is provided
  • At the inlet
  • At the outlet
  • At the summit
  • At any point between inlet and outlet
Answer: At the summit
Q8 | When the coefficient of discharge (Cd) is 0.623, then the general equation for discharge over a rectangular weir is
  • 1.84(L - 0.1nH)H3/2
  • 1.84(L - nH)H2
  • 1.84(L - 0.1nH)H5/2
  • 1.84(L - nH)H3
Answer: 1.84(L - 0.1nH)H3/2
Q9 | In an isothermal atmosphere, the pressure
  • Decreases linearly with elevation
  • Remain constant
  • Varies in the same way as the density
  • Increases exponentially with elevation
Answer: Varies in the same way as the density
Q10 | If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm", the pressure at a depth of 50 m below the oil surface will be
  • 2 meters of water column
  • 3 meters of water column
  • 5 meters of water column
  • 6 meters of water Column
Answer: 6 meters of water Column
Q11 | The pressure intensity in kN/m2 (or kPa) at any point in a liquid is (where w = Specific weight of liquid, and h = Depth of liquid from the surface)
  • w
  • wh
  • w/h
  • h/w
Answer: wh
Q12 | The resultant upward pressure of a fluid on a floating body is equal to the weight of the fluid displaced by the body. This definition is according to
  • Buoyancy
  • Equilibrium of a floating body
  • Archimedes' principle
  • Bernoulli's theorem
Answer: Archimedes' principle
Q13 | The liquid used in manometers should have
  • Low density
  • High density
  • Low surface tension
  • High surface tension
Answer: High surface tension
Q14 | Which of the following instrument can be used for measuring speed of an aeroplane?
  • Venturimeter
  • Orifice plate
  • Pitot tube
  • Rotameter
Answer: Pitot tube
Q15 | A jet of water discharging from a 40 mm diameter orifice has a diameter of 32 mm at its vena contracta. The coefficient of contraction is
  • 0.46
  • 0.64
  • 0.78
  • 0.87
Answer: 0.64
Q16 | Buoyant force is
  • Resultant force acting on a floating body
  • Equal to the volume of liquid displaced
  • Force necessary to keep a body in equilibrium
  • The resultant force on a body due to the fluid surrounding it
Answer: The resultant force on a body due to the fluid surrounding it
Q17 | In case of flow through parallel pipes,
  • The head loss for all the pipes is same
  • The total discharge is equal to the sum of discharges in the various pipes
  • The total head loss is the sum of head losses in the various pipes
  • Both (A) and (B)
Answer: Both (A) and (B)
Q18 | Rotameter is a device used to measure
  • Absolute pressure
  • Velocity of fluid
  • Flow
  • Rotation
Answer: Flow
Q19 | In a broad-crested weir, the discharge is maximum if the head of water on the downstream side of weir is __________ the head of water on the upstream side of weir.
  • Equal to
  • One-third
  • Two-third
  • Three-fourth
Answer: Two-third
Q20 | When a body, floating in a liquid, is given a small angular displacement, it starts oscillating about a point known as
  • Centre of pressure
  • Centre of gravity
  • Centre of buoyancy
  • Metacentre
Answer: Metacentre
Q21 | A nozzle is generally made of
  • Cylindrical shape
  • Convergent shape
  • Divergent shape
  • Convergent-divergent shape
Answer: Convergent shape
Q22 | Pitot tube is used for measurement of
  • Pressure
  • Flow
  • Velocity
  • Discharge
Answer: Velocity
Q23 | The value of mass density in kg-sec-V-
  • 1
  • 1000
  • 100
  • 101.9
Answer: 101.9
Q24 | The shear stress between the two liquid layers is __________ proportional to the distancebetween two layers.
  • Directly
  • Inversely
  • Both A and B
  • None of these
Answer: Inversely
Q25 | Viscosity of water in comparison to mercury is
  • Higher
  • Lower
  • Same
  • Higher/lower depending on temperature
Answer: Higher
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