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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
- 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