Fluid Mechanics Quiz practies questions Test1

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1. Pascal-second is the unit of _____.
pressure	kinematic viscosity
dynamic viscosity	surface tension

2. An ideal fluid is _____.
one which obeys Newton's law of viscosity	frictionless and incompressible
very viscous	frictionless and compressible

3. The unit of kinematic viscosity is _____.
gm/cm-sec2	dyne-sec/cm2
gm/cm2-sec	cm2/sec

4. If the dynamic viscosity of a fluid is 0.5 poise and specific gravity is 0.5, then the kinematic viscosity of that fluid in stokes is _____.
0.25	0.50
1.0	none of the above

5. The viscosity of a gas _____.
decreases with increase in temperature	increases with increase in temperature
is independent of temperature	is independent of pressure for very high pressure intensities

6. Newton's law of viscosity relates _____.
Option A	shear stress and rate of angular deformation
shear stress, viscosity and temperature	viscosity and rate of angular deformation

7. An open tank contains 1 m deep water with 50 cm depth of oil of specific gravity 0.8 above it. The intensity of pressure at the bottom of tank will be
4 kN/m2	10 kN/m2
12 kN/m2	14 kN/m2

8. The position of centre of pressure on a plane surface immersed vertically in a static mass of fluid is ____.
at the centroid of the submerged area	always above the centroid of the area
always below the centroid of the area	none of the above

9. The total pressure on a plane surface inclined at an angle 9 with the horizontal is equal to _____.
PA	pA sin 9
pA cos 9	pA tan 9

10. A vertical rectangular plane surface is submerged in water such that its top and bottom surfaces are 1.5 m and 6.0 m res-pectively below the free surface. The position of centre of pressure below the free surface will be at a distance of _____.
3.75 m	4.0 m
4.2m	4.5m

11. Centre of buoyancy always _____.
coincides with the centre of gravity	coincides with the centroid of the volume of fluid displaced
remains above the centre of gravity	remains below the centre of gravity

12. If the weight of a body immersed in a fluid exceeds the buoyant force, then the body will
rise until its weight equals the buoyant force	tend to move downward and it may finally sink
float	none of the above

13. Metacentric height for small values of angle of heel is the distance between the ____.
centre of gravity and centre of buoyancy	centre of gravity and metacentre
centre of buoyancy and metacentre	free surface and centre of buoyancy

14. A floating body is said to be in a state of stable equilibrium
when its metacentric height is zero	when the metacentre is above the centre of gravity
when the metacentre is below the centre of gravity	only when its centre of gravity is below its centre of buoyancy

15. 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
5kN	10kN
15 kN	20 kN

16. The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as
centre of gravity	centre of buoyancy
centre of pressure	metacentre

17. If a vessel containing liquid moves downward with a constant acceleration equal to 'g' then
the pressure throughout the liquid mass is atmospheric	there will be vacuum in the liquid
the pressure in the liquid mass is greater than hydrostatic pressure	none of the above

18. When a liquid rotates at a constant angular velocity about a vertical axis as a rigid body, the pressure intensity varies
linearly with radial distance	as the square of the radial distance
inversely as the square of the radial distance	inversely as the radial distance

19. 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
g/3	g/2
2g/3	g

20. A right circular cylinder open at the top is filled with liquid and rotated about its vertical axis at such a speed that half the liquid spills out, then the pressure intensity at the centre of bottom is
zero	one-fourth its value when cylinder was full
one-half its value when cylinder was full	cannot be predicted from the given data