Hydraulics And Fluid Mechanics Set 4

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 4

Q1 | Hot wire anemometer is used to measure
  • Pressure in gases
  • Liquid discharge
  • Pressure in liquids
  • Gas velocities
Answer: Gas velocities
Q2 | Venturimeter is used to
  • Measure the velocity of a flowing liquid
  • Measure the pressure of a flowing liquid
  • Measure the discharge of liquid flowing in a pipe
  • Measure the pressure difference of liquid flowing between two points in a pipe line
Answer: Measure the discharge of liquid flowing in a pipe
Q3 | According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to
  • The weight of the body
  • More than the weight of the body
  • Less than the weight of the body
  • Weight of the fluid displaced by the body
Answer: Weight of the fluid displaced by the body
Q4 | The pressure measured with the help of a pressure gauge is called
  • Atmospheric pressure
  • Gauge pressure
  • Absolute pressure
  • Mean pressure
Answer: Gauge pressure
Q5 | The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the Centroid, if
  • The area is horizontal
  • The area is vertical
  • The area is inclined
  • All of the above
Answer: All of the above
Q6 | The most economical section of a rectangular channel is one which has hydraulic mean depth orhydraulic radius equal to
  • Half the depth
  • Half the breadth
  • Twice the depth
  • Twice the breadth
Answer: Half the depth
Q7 | Capillary action is due to the
  • Surface tension
  • Cohesion of the liquid
  • Adhesion of the liquid molecules and the molecules on the surface of a solid
  • All of the above
Answer: All of the above
Q8 | The intensity of pressure on an immersed surface __________ with the increase in depth.
  • Does not change
  • Increases
  • Decreases
  • None of these
Answer: Increases
Q9 | Which of the following statement is correct?
  • In a compressible flow, the volume of the flowing liquid changes during the flow
  • A flow, in which the volume of the flowing liquid does not change, is called incompressible flow
  • When the particles rotate about their own axes while flowing, the flow is said to be rotational flow
  • All of the above
Answer: All of the above
Q10 | A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will
  • Increase
  • Decrease
  • Remain same
  • Increase/decrease depending on depth of immersion
Answer: Remain same
Q11 | A flow through a long pipe at constant rate is called
  • Steady uniform flow
  • Steady non-uniform flow
  • Unsteady uniform flow
  • Unsteady non-uniform flow
Answer: Steady uniform flow
Q12 | Choose the wrong statement
  • Viscosity of a fluid is that property which determines the amount of its resistance to a shearing force
  • Viscosity is due primarily to interaction between fluid molecules
  • Viscosity of liquids decreases with increase in temperature
  • Viscosity of liquids is appreciably affected by change in pressure
Answer: Viscosity of liquids is appreciably affected by change in pressure
Q13 | The unit of dynamic viscosity in S.I. units is
  • N-m/s2
  • N-s/m2
  • Poise
  • Stoke
Answer: N-s/m2
Q14 | A perfect gas
  • Has constant viscosity
  • Has zero viscosity
  • Is in compressible
  • None of the above
Answer: None of the above
Q15 | In a free nappe,
  • The pressure below the nappe is atmospheric
  • The pressure below the nappe is negative
  • The pressure above the nappe is atmospheric
  • The pressure above the nappe is negative
Answer: The pressure below the nappe is atmospheric
Q16 | In a static fluid
  • Resistance to shear stress is small
  • Fluid pressure is zero
  • Linear deformation is small
  • Only normal stresses can exist
Answer: Only normal stresses can exist
Q17 | One litre of water occupies a volume of
  • 1000 cm3
  • 250 cm3
  • 500 cm3
  • 100 cm3
Answer: 1000 cm3
Q18 | A balloon lifting in air follows the following principle
  • Law of gravitation
  • Archimedes principle
  • Principle of buoyancy
  • All of the above
Answer: All of the above
Q19 | The ratio of absolute viscosity to mass density is known as
  • Specific viscosity
  • Viscosity index
  • Kinematic viscosity
  • Coefficient of viscosity
Answer: Kinematic viscosity
Q20 | Reynold's number is the ratio of inertia force to
  • Pressure force
  • Elastic force
  • Gravity force
  • Viscous force
Answer: Viscous force
Q21 | Metacentric height is given as the distance between
  • The center of gravity of the body and the metacentre
  • The center of gravity of the body and the center of buoyancy
  • The center of gravity of the body and the center of pressure
  • Center of buoyancy and metacentre
Answer: The center of gravity of the body and the metacentre
Q22 | In a footstep bearing, if the speed of the shaft is doubled, then the torque required to overcome the viscous resistance will be
  • Double
  • Four times
  • Eight times
  • Sixteen times
Answer: Double
Q23 | The continuity equation is connected with
  • Open channel/pipe flow
  • Compressibility of fluids
  • Conservation of mass
  • Steady/unsteady flow
Answer: Conservation of mass
Q24 | The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to
  • 1/2 × depth
  • 1/2 × breadth
  • 1/2 × sloping side
  • 1/4 × (depth + breadth)
Answer: 1/2 × depth
Q25 | The absolute pressure is equal to
  • Gauge pressure + atmospheric pressure
  • Gauge pressure - atmospheric pressure
  • Atmospheric pressure - gauge pressure
  • Gauge pressure - vacuum pressure
Answer: Gauge pressure + atmospheric pressure
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