### Hydraulics And Fluid Mechanics Set 15

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
• FALSE
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