# Hydraulics and Fluid Mechanics MCQ – Set 25

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(A) 4wd/σ cosα
(B) σ cosα/4wd
(C) 4σ cosα/wd
(D) wd/4σ cosα

## Q2. Specific weight of water in S.I. units is equal to

(A) 1000 N/m3
(B) 10000 N/m3
(C) 9.81 × 103 N/m3
(D) 9.81 × 10⁶ N/m3

Answer: (C) 9.81 × 103 N/m3

(A) Quasi-static
(C) Laminar
(D) Uniform

(A) Up-thrust
(B) Reaction
(C) Buoyancy
(D) Metacentre

(A) N-m/s
(B) N-s/m2
(C) m2/s
(D) N-m

(A) 50 %
(B) 56.7 %
(C) 66.67 %
(D) 76.66 %

## Q7. Water is a __ fluid.

(A) Real
(B) Ideal
(C) Newtonian
(D) Non-Newtonian

(A) Red wood
(B) Say bolt
(C) Engler
(D) Orsat

## Q9. Center of pressure on an inclined plane is

(A) At the Centroid
(B) Above the Centroid
(C) Below the Centroid
(D) At metacentre

## Q10. The viscosity of a liquid __ its rate of flow through a hole in a vessel.

(A) Effects
(B) Does not effect
(C) Both A and B
(D) None of these

(A) d/6
(B) d/4
(C) d/2
(D) d

## Q12. 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

## Q13. The shear stress between the two liquid layers is __ proportional to the distance between two layers.

(A) Directly
(B) Inversely
(C) Both A and B
(D) None of these

## Q14. A liquid would wet the solid, if adhesion forces as compared to cohesion forces are

(A) Less
(B) More
(C) Equal
(D) Less at low temperature and more at high temperature

## Q15. 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

## Q16. Which of the following instrument can be used for measuring speed of a submarine moving in deep sea?

(A) Venturimeter
(B) Orifice plate
(C) Hot wire anemometer
(D) Pitot tube

## Q17. Two dimensional flows 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 plane

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

## Q18. The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly enlarged to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden enlargement is

(A) (v₁ – v₂)²/g
(B) (v₁² – v₂²)/g
(C) (v₁ – v₂)²/2g
(D) (v₁² – v₂²)/2g

(A) wA
(B) wx
(C) wAx
(D) wAx/sinθ