# Fluid Mechanics MCQ (Multiple Choice Questions) - SchoolingAxis

1. Centre of buoyancy always

a) coincides with the centre of gravity

b) coincides with the centroid of the volume of fluid displaced

c) remains above the centre of gravity

d) remains below the centre of gravity

Ans: b

2. If the weight of a body immersed in a fluid exceeds the buoyant force, then the body will

a) rise until its weight equals the buoyant force

b) tend to move downward and it may finally sink

c) float

d) none of the above

Ans: b

3. Metacentric height for small values of angle of heel is the distance between the

a) centre of gravity and centre of buoy-ancy

b) centre of gravity and metacentre

c) centre of buoyancy and metacentre

d) free surface and centre of buoyancy

Ans: b

4. A floating body is said to be in a state of stable equilibrium

a) when its metacentric height is zero

b) when the metacentre is above the centre of gravity

c) when the metacentre is below the centre of gravity

d) only when its centre of gravity is below its centre of buoyancy

Ans: b

5. The increase in meta centric height

i) increases stability

ii) decreases stability

iii) increases comfort for passengers

iv) decreases comfort for passengers

a) (i) and (iii)

b) (i)and(iv)

c) (ii) and (iii)

d) (ii) and (iv)

Ans: b

6. A rectangular block 2 m long, 1 m wide and 1 m deep floats in water, the depth of immersion being 0.5 m. If water weighs 10 kN/m3, then the weight of the block is

a) 5kN

b) lOkN

c) 15 kN

d) 20 kN

Ans: b

7. The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as

a) center of gravity

b) center of buoyancy

c) center of pressure

d) metacentre

Ans: c

8. If a vessel containing liquid moves downward with a constant acceleration equal to ‘g’ then

a) the pressure throughout the liquid mass is atmospheric

b) there will be vacuum in the liquid

c) the pressure in the liquid mass is greater than hydrostatic pressure

d) none of the above

Ans: a

9. When a liquid rotates at a constant angular velocity about a vertical axis as a rigid body, the pressure intensity varies

b) as the square of the radial distance

c) inversely as the square of the radial distance

d) inversely as the radial distance

Ans: b

10. An open cubical tank of 2 m side is filled with water. If the tank is rotated with an acceleration such that half of the water spills out, then the acceleration is equal to

a) g/3

b) g/2

c) 2g/3

d) g

Ans: d