Fluid Mechanics Problems Quiz multiple choice questions download free

1.    Pascal-second is the unit of
a)    pressure
b)    kinematic viscosity
c)    dynamic viscosity
d)    surface tension

Ans: c

2.    An ideal fluid is
a)    one which obeys Newton's law of viscosity
b)    frictionless and incompressible
c)    very viscous
d)    frictionless and compressible

Ans: b

3.    The unit of kinematic viscosity is
a)    gm/cm-sec2
b)    dyne-sec/cm2
c)    gm/cm2-sec
d)    cm2/sec

Ans: d

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
a)    0.25
b)    0.50
c)    1.0
d)    none of the above

Ans: c

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

Ans: b

6.       Newton's law of viscosity relates
a)    intensity of pressure and rate of angular deformation
b)    shear stress and rate of angular deformation
c)    shear stress, viscosity and temperature
d)    viscosity and rate of angular deformation

Ans: b

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
a)    4 kN/m2
b)    10 kN/m2
c)    12 kN/m2
d)    14 kN/m2

Ans: d

8.    The position of center of pressure on a plane surface immersed vertically in a static mass of fluid is
a)    at the centroid of the submerged area
b)    always above the centroid of the area
c)    always below the centroid of the area
d)    none of the above

Ans: c

9.     The total pressure on a plane surface inclined at an angle 9 with the horizontal is equal to
a)    PA
b)    pA sin 9
c)    pA cos 9
d)    pA tan 9
where p is pressure intensity at centroid of area and A is area of plane surface.

Ans: a

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 center of pressure below the free surface will be at a distance of
a)    3.75 m
b)    4.0 m
c)    4.2m
d)    4.5m

Ans: c

11.    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

12.    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

13.    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

14. 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

15.   The increase in meta centric height
i)    increases stability
ii)   decreases stability
iii) increases comfort for passengers
iv) decreases comfort for passengers
The correct answer is
a)    (i) and (iii)
b)    (i)and(iv)
c)    (ii) and (iii)
d)    (ii) and (iv)

Ans: b

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