# Practice Test: Question Set - 18

**1. For a perfect incompressible liquid, flowing in a continuous stream, the total energy of a particle remains the same, while the particle moves from one point to another. This statement is called**

- (A) Continuity
equation

- (B) Bernoulli's
equation

- (C) Pascal's
law

- (D) Archimedes’s
principle

**2. Uniform flow occurs when**

- (A) The direction and magnitude of the velocity
at all points are identical

- (B) The velocity of
successive fluid particles, at any point, is the same at successive periods of
time

- (C) The magnitude and
direction of the velocity do not change from point to point in the fluid

- (D) The fluid particles
move in plane or parallel planes and the streamline patterns are identical in
each pleasure

**3. The critical depth for a channel is given by (where**

*q*= Unit discharge (discharge per unit width) through the channel)- (A)

*(q/g)*

^{1/2}- (B)

*(q²/g)*

^{1/3}- (C)

*(q³/g)*

^{1/4}- (D)

*(q⁴/g)*

^{1/5}**4. At the center line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be**

- (A) Minimum

- (B) Maximum

- (C) Zero

- (D) Could be any value

**5. The discharge through a channel of trapezoidal section is maximum when**

- (A) Width
of channel at the top is equal to twice the width at the bottom

- (B) Depth of
channel is equal to the width at the bottom

- (C) The
sloping side is equal to half the width at the top

- (D) The
sloping side is equal to the width at the bottom

**6. Piezometer is used to measure**

- (A) Pressure in pipe,
channels etc.

- (B) Atmospheric pressure

- (C) Very low pressures

- (D) Difference of
pressure between two points

**7. The point at which the resultant pressure on an immersed surface acts, is known as**

- (A) Centre of
gravity

- (B) Centre
of depth

- (C) Centre
of pressure

- (D) Centre of
immersed surface

**8. Choose the wrong statement**

- (A) Any weight, floating
or immersed in a liquid, is acted upon by a buoyant force

- (B) Buoyant force is equal to the weight of the
liquid displaced

- (C) The point through
which buoyant force acts, is called the center of buoyancy

- (D) Center of buoyancy is
located above the center of gravity of the displaced liquid

**9. The centre of pressure for a vertically immersed surface lies at a distance equal to __________ the centre of gravity.**

- (A)

*I*bellow

_{G }/ Ax̅- (B)

*I*above

_{G }/ Ax̅- (C)

*Ax̅ / I*bellow

_{G}- (D)

*Ax̅ / I*

_{G}above**10. The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm". The pressure at 2.5 m below the oil surface will be**

- (A) 2 metres of water column

- (B) 3 metres of water column

- (C) 3.5 metres of water
column

- (D) 4 m of water column

**11. The total pressure on the top of a closed cylindrical vessel completely filled up with a liquid is**

- (A) Directly
proportional to (radius)

^{2}

- (B) Inversely
proportional to (radius)

^{2}

- (C) Directly
proportional to (radius)

^{4}

- (D) Inversely
proportional to (radius)

^{4}

**12. The flow which neglects changes in a transverse direction is known as**

- (A) One dimensional flow

- (B) Uniform flow

- (C) Steady flow

- (D) Turbulent flow

**13. A moving fluid mass may be brought to a static equilibrium position, by applying an imaginary inertia force of the same magnitude as that of the accelerating force but in the opposite direction. This statement is called**

- (A) Pascal's law

- (B) Archimedes’s
principle

- (C) D-Alembert's
principle

- (D) None of
these

**14. Normal depth in open channel flow is the depth of flow corresponding to**

- (A) Steady flow

- (B) Unsteady flow

- (C) Laminar flow

- (D) Uniform flow

**15. The mass per unit volume of a liquid at a standard temperature and pressure is called**

- (A) Specific
weight

- (B) Mass density

- (C) Specific
gravity

- (D) None
of these

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