# Practice Test: Question Set - 22

**1. When a cylindrical vessel containing liquid is revolved about its vertical axis at a constant angular velocity, the pressure**

- (A) Varies
as the square of the radial distance

- (B) Increases
linearly as its radial distance

- (C) Increases
as the square of the radial distance

- (D) Decreases
as the square of the radial distance

**2. Property of a fluid by which its own molecules are attracted is called**

- (A) Adhesion

- (B) Cohesion

- (C) Viscosity

- (D) Compressibility

**3. According to Bazin's formula, the discharge over a rectangular weir is**

*mL*2*g*x*H*^{3/2}where*m*is equal to- (A)

*0.405 + (0.003/H)*

- (B)

*0.003 + (0.405/H)*

- (C)

*0.405 + (H/0.003)*

- (D)

*0.003 + (H/0.405)*

**4. Which of the following is the unit of kinematic viscosity?**

- (A) Pascal

- (B) Poise

- (C) Stoke

- (D) Faraday

**5. The length**

*AB*of a pipe*ABC*in which the liquid is flowing has diameter (*d*_{1}) and is suddenly contracted to diameter (*d*_{2}) at*B*which is constant for the length*BC*. The loss of head due to sudden contraction, assuming coefficient of contraction as 0.62, is- (A)

*v₁²/2g*

- (B)

*v₂²/2g*

- (C)

*0.5 v₁²/2g*

- (D)

*0.375 v₂²/2g*

**6. Operation of McLeod gauge used for low pressure measurement is based on the principle of**

- (A) Gas law

- (B) Boyle's law

- (C) Charles law

- (D) Pascal's law

**7. Reynold's number is the ratio of the inertia force to the**

- (A) Surface
tension force

- (B) Viscous
force

- (C) Gravity
force

- (D) Elastic
force

**8. A piece weighing 3 kg in air was found to weigh 2.5 kg when submerged in water. Its specific gravity is**

- (A) 1

- (B) 5

- (C) 7

- (D) 6

**9. A differential manometer is used to measure**

- (A) Atmospheric
pressure

- (B) Pressure
in pipes and channels

- (C) Pressure
in Venturimeter

- (D) Difference
of pressures between two points in a pipe

**10. In a lock-gate, the reaction between two gates is (where**

*P*= Resultant pressure on the lock gate, and α = Inclination of the gate with the normal to the side of the lock)- (A)

*p/sinα*

- (B)

*2p/sinα*

- (C)

*p/2sinα*

- (D)

*2p/sin (α/2)*

**11. In a venturi-flume, the flow takes place at**

- (A) Atmospheric
pressure

- (B) Gauge
pressure

- (C) Absolute
pressure

- (D) None
of these

**12. The normal stress is same in all directions at a point in a fluid**

- (A) Only when the fluid
is frictionless

- (B) Only when the fluid
is incompressible and has zero viscosity

- (C) When there is no
motion of one fluid layer relative to an adjacent layer

- (D) Irrespective of the
motion of one fluid layer relative to an adjacent layer

**13. The highest efficiency is obtained with a channel of __________ section.**

- (A) Circular

- (B) Square

- (C) Rectangular

- (D) Trapezoidal

**14. A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall per unit length is (where**

*w*= Specific weight of liquid, and*H*= Height of liquid)- (A)

*wH*

- (B)

*wH*/2

- (C)

*wH*/2

^{2}- (D)

*wH*

^{2}/3

**15. Which of the following manometer has highest sensitivity?**

- (A) U-tube with water

- (B) Inclined U-tube

- (C) U-tube with mercury

- (D) Micro-manometer with
water

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