# Practice Test: Question Set - 23

**1. The velocity corresponding to Reynold number of 2800, is called**

- (A) Sub-sonic
velocity

- (B) Super-sonic
velocity

- (C) Lower
critical velocity

- (D) Higher
critical velocity

**2. For a floating body to be in equilibrium**

- (A) Meta centre should be above e.g.

- (B) Centre of buoyancy
and e.g. must lie on same vertical plane

- (C) A righting couple should be formed

- (D) All of the above

**3. When an internal mouthpiece is running free, the discharge through the mouthpiece is (where**

*a*= Area of mouthpiece, and*H*= Height of liquid above the mouthpiece)- (A)

*0.5 a. √2gH*

- (B)

*0.707 a. √2gH*

- (C)

*0.855 a. √2gH*

- (D)

*a.*

*√2gH*

**4. A uniform body 3 m long, 2 m wide and 1 m deep floats in water. If the depth of immersion is 0.6 m, then the weight of the body is**

- (A) 3.53 kN

- (B) 33.3 kN

- (C) 35.3 kN

- (D) None of
these

**5. The force per unit length is the unit of**

- (A) Surface
tension

- (B) Compressibility

- (C) Capillarity

- (D) Viscosity

**6. When the Mach number is more than 6, the flow is called**

- (A) Sub-sonic
flow

- (B) Sonic flow

- (C) Super-sonic
flow

- (D) Hyper-sonic
flow

**7. The upper surface of a weir over which water flows is known is**

- (A) Crest

- (B) Nappy

- (C) Sill

- (D) Weir top

**8. One cubic metre of water weighs**

- (A) 100 liters

- (B) 250 liters

- (C) 500 liters

- (D) 1000 liters

**9. Kinematic viscosity is dependent upon**

- (A) Pressure

- (B) Distance

- (C) Density

- (D) Flow

**10. The discharge through a large rectangular orifice is given by (where**

*H*_{1}= Height of the liquid above the top of the orifice,*H*_{2}= Height of the liquid above the bottom of the orifice,*b*= Breadth of the orifice, and*C*= Coefficient of discharge)_{d}- (A)

*Q*

*= (2/3) C*

_{d}*×*

*b ×*√

*(2g) ×*

*(H*

_{2}- H_{1})- (B)

*Q*

*= (2/3) C*

_{d}*×*

*b ×*√

*(2g) ×*

*(H*

_{2}^{1/2}- H_{1}^{1/2})- (C)

*Q =*

*(2/3) C*

_{d}*×*

*b ×*√

*(2g) ×*

*(H*

_{2}^{3/2}- H_{1}^{3/2})- (D)

*Q*

*= (2/3) C*

_{d}*×*

*b ×*√

*(2g) ×*

*(H*

_{2}^{2}- H_{1}^{2})**11. An error of 1% in measuring head over the apex of the notch (**

*H*) will produce an error of _________ in discharge over a triangular notch.- (A) 1 %

- (B) 1.5 %

- (C) 2 %

- (D) 2.5 %

**12. The Euler's equation for the motion of liquids is based upon the assumption that**

- (A) The
fluid is non - viscous, homogeneous and incompressible

- (B) The velocity
of flow is uniform over the section

- (C) The
flow is continuous, steady and along the stream line

- (D) All
of the above

**13. The ratio of the inertia force to the viscous force is called**

- (A) Reynold's
number

- (B) Froude's
number

- (C) Weber's
number

- (D) Euler's
number

**14. The total energy of a liquid particle in motion is equal to**

- (A) Pressure
energy + kinetic energy + potential energy

- (B) Pressure
energy - (kinetic energy + potential energy)

- (C) Potential
energy - (pressure energy + kinetic energy

- (D) Kinetic
energy - (pressure energy + potential energy)

**15. Which of the following instrument can be used for measuring speed of a submarine moving in deep sea?**

- (A) Venturimeter

- (B) Orifice plate

- (C) Hot wire anemometer

- (D) Pitot tube

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