A.
The absolute roughness of a pipe de-creases with time5
B.
A pipe becomes smooth after using for long time/
C.
The friction factor decreases with time'
D.The absolute roughness increases with time*
Q.2:
The unit of kinematic viscosity is_______________?2
A.
gm/cm-sec2
B.
dyne-sec/cm2
C.
gm/cm2-sec
D.cm2/sec
Q.3:
Pascal-second is the unit of______________?+
A.
pressure
B.
kinematic viscosity
C.dynamic viscosity
D.
surface tension
Q.4:
An ideal fluid is_______________?!
A.
one which obeys Newtons law of viscosity+
B.frictionless and incompressible
C.
very viscous
D.
frictionless and compressible
Q.5:
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
Q.6:
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=
Q.7:
Newtons law of viscosity relates________________?4
A.
intensity of pressure and rate of angular deformation5
B.shear stress and rate of angular deformation,
C.
shear stress, viscosity and temperature'
D.
viscosity and rate of angular deformation)
Q.8:
The position of center of pressure on a plane surface immersed vertically in a static mass of fluid is______________?u
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
Q.9:
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
Q.10:
A floating body is said to be in a state of stable equilibrium_________________?P
A.
when its metacentric height is zero#
B.when the metacentre is above the centre of gravity2
C.
when the metacentre is below the centre of gravity2
D.
only when its centre of gravity is below its centre of buoyancy?