##### SSC JE 25 SEPTEMBER 2019, SHIFT-2

(a) h2.S m water
(b) h1 m water
(c) (h2.S – h1) m of water
(d) h2 m of manomatric liquid

Ans: (c) (h2.S – h1) m of water

##### Q2. A compound pipe of diameter d1, d2 and d3 having lengths l1, l2 and l3 is to be replaced by an equivalent pipe of uniform diameter d and of the same length (l) as that of the compound pipe. The size of the equivalent pipe is given by

(a) l/d² = (l₁/d₁²) + (l₂/d₂²) + (l₃/d₃²)
(b) l/d³ = (l₁/d₁³) + (l₂/d₂³) + (l₃/d₃³)
(c) l/d⁴ = (l₁/d₁⁴) + (l₂/d₂⁴) + (l₃/d₃⁴)
(d) l/d⁵ = (l₁/d₁⁵) + (l₂/d₂⁵) + (l₃/d₃⁵)

Ans: (d) l/d⁵ = (l₁/d₁⁵) + (l₂/d₂⁵) + (l₃/d₃⁵)

##### Q3. Gradually varied flow is

Ans: (d) Steady non-uniform

##### Q4. Practical fluids

(a) Are viscous
(b) Possess surface tension
(c) Are compressible
(d) Possess all the above properties

Ans: (d) Possess all the above properties

##### Q5. 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?

(a) The pressure on the wall at the liquid level is minimum
(b) The pressure on the bottom of the wall is maximum
(c) The pressure on the wall at the liquid level is zero, and on the bottom of the wall is maximum
(d) The pressure on the bottom of the wall is zero

Ans: (c) The pressure on the wall at the liquid level is zero, and on the bottom of the wall is maximum

##### Q6. The tendency of a liquid surface to contract is due to the following property

(a) Cohesion
(c) Viscosity
(d) Surface tension

Ans: (d) Surface tension

##### Q7. A path line :                                                  SSC JE 27 SEPTEMBER 2019, SHIFT-1

(a) indicates fluid velocity
(b) cannot be defined for fluid flows
(c) indicates local fluid direction
(d) indicates path taken by a fluid element

Ans: (d) indicates path taken by a fluid element

##### Q8. The flow in a pipe is neither laminar nor turbulent when Reynold number is

(a) Less than 2000
(b) Between 2000 and 2800
(c) More than 2800
(d) None of these

Ans: (b) Between 2000 and 2800

##### Q9. The viscosity of water at 20°C is

(a) One stoke
(b) One centistoke
(c) One poise
(d) One centipoise

Ans: (d) One centipoise

##### Q10. Mercury is often used in barometer because

(a) It is the best liquid
(b) The height of barometer will be less
(c) Its vapour pressure is so low that it may be neglected
(d) Both (b) and (c)

Ans: (d) Both (b) and (c)

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Hydraulics and Fluid mechanics MCQ-Section-1

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