Hydraulics And Fluid Mechanics Set 5

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 5

Q1 | Unit of surface tension is
  • Energy/unit area
  • Velocity/unit area
  • Both of the above
  • It has no units
Answer: Energy/unit area
Q2 | A Piezometer tube is used only for measuring
  • Low pressure
  • High pressure
  • Moderate pressure
  • Vacuum pressure
Answer: Moderate pressure
Q3 | The Cipoletti weir is a __________ weir.
  • Rectangular
  • Triangular
  • Trapezoidal
  • Circular
Answer: Trapezoidal
Q4 | Pressure of the order of 10" torr can be measured by
  • Bourdon tube
  • Pirani Gauge
  • Micro -manometer
  • Lonisation gauge
Answer: Lonisation gauge
Q5 | The volume of a fluid __________ as the pressure increases.
  • Remains same
  • Decreases
  • Increases
  • None of these
Answer: Decreases
Q6 | Buoyant force is
  • The resultant force acting on a floating body
  • The resultant force on a body due to the fluid surrounding it
  • Equal to the volume of liquid displaced
  • The force necessary to maintain equilibrium of a submerged body
Answer: The resultant force on a body due to the fluid surrounding it
Q7 | A flow through a long pipe at decreasing rate is called __________ uniform flow.
  • Steady
  • Unsteady
  • Both A and B
  • None of these
Answer: Unsteady
Q8 | Choose the wrong statement
  • The center of buoyancy is located at the center of gravity of the displaced liquid
  • For stability of a submerged body, the center of gravity of body must lie directly below the center of buoyancy
  • If C.G. and center of buoyancy coincide, the submerged body must lie at neutral equilibrium for all positions
  • All floating bodies are stable
Answer: All floating bodies are stable
Q9 | The intensity of pressure at any point, in a liquid, is __________ to the depth of liquid from the surface.
  • Equal
  • Directly proportional
  • Inversely proportional
  • None of these
Answer: Directly proportional
Q10 | The discharge in an open channel corresponding to critical depth is
  • Zero
  • Minimum
  • Maximum
  • None of these
Answer: Maximum
Q11 | A piece of wood having weight 5 kg floats in water with 60% of its volume under the liquid. Thespecific gravity of wood is
  • 0.83
  • 0.6
  • 0.4
  • 0.3
Answer: 0.6
Q12 | A pitot tube is used to measure the
  • Velocity of flow at the required point in a pipe
  • Pressure difference between two points in a pipe
  • Total pressure of liquid flowing in a pipe
  • Discharge through a pipe
Answer: Velocity of flow at the required point in a pipe
Q13 | The total energy of each particle at various places in the case of perfect incompressible fluidflowing in continuous stream
  • Keeps on increasing
  • Keeps on decreasing
  • Remain constant
  • May increase/decrease
Answer: Remain constant
Q14 | The critical depth meter is used to measure
  • Velocity of flow in an open channel
  • Depth of flow in an open channel
  • Hydraulic jump
  • Depth of channel
Answer: Hydraulic jump
Q15 | Two pipe systems can be said to be equivalent, when the following quantities are same
  • Friction loss and flow
  • Length and diameter
  • Flow and length
  • Friction factor and diameter
Answer: Friction loss and flow
Q16 | In a footstep bearing, if the radius of the shaft is doubled, then the torque required to overcome theviscous resistance will be
  • Double
  • Four times
  • Eight times
  • Sixteen times
Answer: Sixteen times
Q17 | The value of bulk modulus of a fluid is required to determine
  • Reynold's number
  • Froude's number
  • Mach number
  • Euler's number
Answer: Mach number
Q18 | Fluid is a substance which offers no resistance to change of
  • Pressure
  • Flow
  • Shape
  • Volume
Answer: Shape
Q19 | The pressure less than atmospheric pressure is known as
  • Suction pressure
  • Vacuum pressure
  • Negative gauge pressure
  • All of these
Answer: All of these
Q20 | The normal stress in a fluid will be constant in all directions at a point only if
  • It is incompressible
  • It has uniform viscosity
  • It has zero viscosity
  • It is at rest
Answer: It is at rest
Q21 | The power transmitted through a pipe is (where w = Specific weight in N/m3, and Q = Discharge in m3/s)
  • w × Q × H
  • w × Q × hf
  • w × Q (H - hf)
  • w × Q (H + h )
Answer: w × Q (H - hf)
Q22 | A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if
  • Length of both the pipes is same
  • Diameter of both the pipes is same
  • Loss of head and discharge of both the pipes is same
  • Loss of head and velocity of flow in both the pipes is same
Answer: Loss of head and discharge of both the pipes is same
Q23 | The center of gravity of the volume of the liquid displaced by an immersed body is called
  • Metacentre
  • Center of pressure
  • Center of buoyancy
  • Center of gravity
Answer: Center of buoyancy
Q24 | A flow is called sub-sonic, if the Mach number is
  • Less than unity
  • Unity
  • Between 1 and 6
  • More than 6
Answer: Less than unity
Q25 | Barometer is used to measure
  • Pressure in pipes, channels etc.
  • Atmospheric pressure
  • Very low pressure
  • Difference of pressure between two points
Answer: Atmospheric pressure
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