Hydraulics And Fluid Mechanics Set 15

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This set of Hydraulics and Fluid Mechanics Multiple Choice Questions & Answers (MCQs) focuses on Hydraulics And Fluid Mechanics Set 15

Q1 | When a body is placed over a liquid, it will sink down if
  • gravitational force is equal to the upthrust of the liquid
  • gravitational force is les than the upthrust of the liquid
  • gravitational force is more than the upthrust of the liquid
  • none of the above
Q2 | The pressure of air
  • does not change
  • decreases
  • increases
Q3 | If the coefficient of discharge is 0.6, then the discharge over a right angled notch is
  • 0.417 H5/2
  • 1.417 H5/2
  • 4.171 H5/2
  • 7.141 H5/2
Q4 | The velocity corresponding to Reynold number of 2000 is called
  • sub-sonic velocity
  • super-sonic velocity
  • lower critical velocity
  • higher critical velocity
Q5 | The unit of surface tension is
  • N / m
  • N / m2
  • N / m3
  • N - m
Q6 | The velocity at which the turbulent flow starts is known as higher critical velocity.
  • Yes
  • No
Q7 | In order to measure the flow with a venturimeter, it is installed in
  • horizontal line
  • inclined line with flow upwards
  • inclined line with flow downwards
  • any direction and in any location
Q8 | The shear stress-strain graph for a non-newtonian fluid is a curve.
  • Correct
  • Incorrect
Q9 | The velocity of liquid flowing through an orifice varies with the available head of the liquid.
  • Agree
  • Disagree
Q10 | The D-Alembert's principle is used for changing the dynamic equilibrium of a fluid mass, into a static equilibrium.
  • Agree
  • Disagree
Q11 | When the Mach number is between
  • 1 and 2.5
  • 2.5 and 4
  • 4 and 6
  • 1 and 6
Q12 | The hoss of hed due to an obstruction in a pipe is twice the loss of head at its entrance.
  • Agree
  • Disagree
Q13 | The dynamic viscosity of gases
  • remain unaffected
  • increases
  • decreases
Q14 | A fluid whose viscosity does not change with the rate of deformation or shear strain is known as
  • real fluid
  • ideal fluid
  • newtonian fluid
  • non-newtonian fluid
Q15 | If a body floating in a liquid returns back to its original position, when given a small angular displacement, the body is said to be in
  • neutral equilibrium
  • stable equilibrium
  • unstable equilibrium
  • none of these
Q16 | The property of a liquid which controls its rate of flow is called viscosity.
  • TRUE
Q17 | Reyold's number is the ratio of the inertia force to the
  • surface tension force
  • viscous force
  • gravity force
  • elastic force
Q18 | When the end contractions of the weir are suppressed, then number of end contractions (n) are taken as zero
  • Agree
  • Disagree
Q19 | The specific gravity has no units.
  • Agree
  • Disagree
Q20 | A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. Which of the following statement is correct?
  • The pressure on the wall at the liquid level is minimum.
  • The pressure on the bottom of the wall is maximum
  • The pressure on the wall at the liquid level is zero, and on the bottom of the wall is maximum
  • The pressure on the bottom of the wall is zero.
Q21 | The stability of a dam is checked for
  • tension at the base
  • overturning of the wall or dam
  • sliding of the wall or dam
  • all of these
Q22 | The centre of buoyancy is the centre of area of the immersed body.
  • Correct
  • Incorrect
Q23 | The shear stress between the two liquid layers is
  • directly
  • indirectly
Q24 | The kinematic viscosity of an oil (in stokes) whose specific gravity is 0.95 and viscosity 0.011 poise, is
  • 0.0116 stoke
  • 0.116 stoke
  • 0.0611 stoke
  • 0.611 stoke
Q25 | A nozzle placed at the end of a water pipe line discharges water at a
  • low pressure
  • high pressure
  • low velocity
  • high velocity