## IES 2016 Fluid Mechanics solved questions

Question #1

In a differential manometer, a head of 0.5 m of fluid A in limb 1 is found to balance a head of 0.3 m of fluid B in limb 2. The atmospheric pressure is 760 mm of mercury. The ratio of specific gravities of A to B is:

(A) 0.25

(B) 0.6

(C) 2

(B) 4

Question #2

If angle of contact of a drop of liquid is acute, then

(A) Cohesion is equal to adhesion

(B) Cohesion is more than adhesion

(C) Adhesion is more than cohesion

(D) Both adhesion and cohesion have no connection with angle of contact

Question #3

Uniform flow occurs when:

(A) At every point the velocity vector is identical in magnitude and direction at any given instance

(C) Discharge through a pipe is constant

(D) Conditions do not change with at any time

Question #4

A vacuum gauge fixed on a steam condenser reads 80 kPa vacuum. The barometer indicates 1.013 bar. The absolute pressure in terms of mercury head is, nearly

(A) 160 mm of Hg

(B) 190 mm of Hg

(C) 380 mm of Hg

(D) 760 mm of Hg

Question #5

A 25 cm long prismatic homogeneous solid floats in water with its axis vertical and 10 cm projecting above water surface. If the same solid floats in some oil with its axis vertical and 5 cm projecting above the liquid surface, then the specific gravity of the oil is

(A) 0.55

(B) 0.65

(C) 0.75

(D) 0.85

Question #6

Consider the following statements:

The increase in metacentric height

1. Increases stability

2. Decreases stability

3. Increases comfort for passengers in a ship

4. Decreases comfort for passengers in a ship

Which of the above statements are correct?

(A) 1 and 3

(B) 1 and 4

(C) 2 and 3

(D) 2 and 4

Question #7

An isosceles triangular lamina of base 1m and height 2m is located in the water in vertical plane and its vertex is 1m below the free surface of the water. The position of force acting on the lamina from the free water surface is:

(A) 2.42 m

(B) 2.33 m

(C) 2.00 m

(D) 1.33 m

Question #8

A solid body of specific gravity 0.5 is 10 m long 3m wide and 2m high. When it floats in water with its shortest edge vertical, its metacentric height is:

(A) 0.75m

(B) 0.45 m

(C) 0.25 m

(D) 0.15m

Question #9

For a steady two-dimensional flow, the scalar components of the velocity field are Vx = – 2x, Vy = 2y and Vz = 0. The corresponding components of acceleration a x and ay respectively are:

(A) 0 and 4y

(B) 4x and 0

(C) 0 and 0

(D) 4x and 4y