# Hydraulics and Fluid Mechanics MCQ – Set 23

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## Q1. The flow which neglects changes in a transverse direction is known as

(A) One dimensional flow
(B) Uniform flow
(D) Turbulent flow

## Q2. When the coefficient of discharge (Cd) is 0.623, then the general equation for discharge over a rectangular weir is

(A) 1.84(L – 0.1nH)H3/2
(B) 1.84(L – nH)H2
(C) 1.84(L – 0.1nH)H5/2
(D) 1.84(L – nH)H3

(A) Pressure
(B) Flow
(C) Velocity
(D) Discharge

## Q4. Bulk modulus of a fluid is the ratio of

(A) Shear stress to shear strain
(B) Increase in volume to the viscosity of fluid
(C) Increase in pressure to the volumetric strain
(D) Critical velocity to the viscosity of fluid

Answer: (C) Increase in pressure to the volumetric strain

## Q5. 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

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

## Q6. 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

Answer: (D) All of the above

## Q7. The line of action of the buoyant force acts through the

(A) Centroid of the volume of fluid vertically above the body
(B) Centre of the volume of floating body
(C) Center of gravity of any submerged body
(D) Centroid of the displaced volume of fluid

Answer: (D) Centroid of the displaced volume of fluid

(A) Energy
(B) Work
(C) Mass
(D) Length

## Q9. 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

Answer: (D) All of the above

(A) Plus
(B) Minus
(C) Divide
(D) Multiply

## Q11. The stability of a dam is checked for

(A) Tension at the base
(B) Overturning of the wall or dam
(C) Sliding of the wall or dam
(D) All of these

## Q12. The mercury does not wet the glass. This is due to the property of the liquid known as

(A) Cohesion
(C) Viscosity
(D) Surface tension

(A) N/mm2
(B) N/m2
(D) All of these

## Q14. An internal mouthpiece is said to be running __ if the length of the mouthpiece is more than three times the diameter of the orifice.

(A) Free
(B) Partially
(C) Full
(D) None of these

## Q15. Bulk modulus of a fluid __ as the pressure increases.

(A) Remain same
(B) Decreases
(C) Increases
(D) None of these

## Q16. If a body floating in a liquid returns back to its original position, when given a small angular displacement, the body is said to be in

(A) Neutral equilibrium
(B) Stable equilibrium
(C) Unstable equilibrium
(D) None of these

## Q17. A flow whose streamline is represented by a curve, is called

(A) One-dimensional flow
(B) Two-dimensional flow
(C) Three-dimensional flow
(D) Four-dimensional flow

## Q18. 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

## Q19. In an isothermal atmosphere, the pressure

(A) Decreases linearly with elevation
(B) Remain constant
(C) Varies in the same way as the density
(D) Increases exponentially with elevation

Answer: (C) Varies in the same way as the density

(A) Cc × Cv
(B) Cc × Cr
(C) Cv × Cr
(D) Cc/Cr