# Practice Test: Question Set - 26

**1. In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.**

- (A) Less than

- (B) More
than

- (C) Equal to

- (D) None
of these

**2. Poise is the unit of**

- (A) Surface tension

- (B) Capillarity

- (C) Viscosity

- (D) Shear stress in
fluids

**3. Viscous force is the __________ of shear stress due to viscosity and cross-section area of flow.**

- (A) Sum

- (B) Different

- (C) Product

- (D) Ratio

**4. The siphon will work satisfactorily, if the minimum pressure in the pipe is __________ vapour pressure of liquid.**

- (A) Equal to

- (B) Less than

- (C) More than

- (D) None of
these

**5. The tangential velocity of the water element having a free vortex is**

- (A) Directly
proportional to its distance from the centre

- (B) Inversely
proportional to its distance from the centre

- (C) Directly
proportional to its (distance)

^{2}from the centre

- (D) Inversely
proportional to its (distance)

^{2}from the centre

**6. The horizontal component of buoyant force is**

- (A) Negligible

- (B) Same as buoyant force

- (C) Zero

- (D) None of the above

**7. A flow in which the quantity of liquid flowing per second is constant, is called __________ flow.**

- (A) Steady

- (B) Streamline

- (C) Turbulent

- (D) Unsteady

**8. The divergent portion of a Venturimeter is made longer than convergent portion in order to**

- (A) Avoid
the tendency of breaking away the stream of liquid

- (B) To minimize frictional losses

- (C) Both (A) and
(B)

- (D) None of
these

**9. According to Chezy's formula, the discharge through an open channel is (where**

*A*= Area of flow,*C*= Chezy's constant,*m*= Hydraulic mean depth, and*i*= Uniform slope in bed)- (A)

*A*

*× √(m × i)*

- (B)

*C*

*× √(m × i)*

- (C)

*AC*

*× √(m × i)*

- (D)

*mi*

*× √(A × C)*

**10. In a free vortex motion, the radial component of velocity everywhere is**

- (A) Maximum

- (B) Minimum

- (C) Zero

- (D) Nonzero and finite

**11. Coefficient of contraction is the ratio of**

- (A) Actual
velocity of jet at vena contracta to the theoretical velocity

- (B) Loss
of head in the orifice to the head of water available at the exit of the
orifice

- (C) Loss
of head in the orifice to the head of water available at the exit of the
orifice

- (D) Area of jet
at vena-contracta to the area of orifice

**12. The Bernoulli's equation is based on the assumption that**

- (A) There is no
loss of energy of the liquid flowing

- (B) The
velocity of flow is uniform across any cross-section of the pipe

- (C) No force
except gravity acts on the fluid

- (D) All
of the above

**13. The flow in a pipe is turbulent when Reynold number is**

- (A) Less than
2000

- (B) Between 2000
and 2800

- (C) More than
2800

- (D) None of
these

**14. When the flow parameters at any given instant remain same at every point, then flow is said to be**

- (A) Quasi-static

- (B) Steady state

- (C) Laminar

- (D) Uniform

**15. The total pressure on an immersed surface inclined at an angle θ with the liquid surface is**

- (A)

*wA*

- (B)

*wx*

- (C)

*wAx*

- (D)

*wAx*/

*sinθ*

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