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1.). What is boundary layer ?
Ans.-Boundary layer is the fluid layer
in the neighborhood of a solid
boundary where the effects of fluid
friction are predominant.
2.)What is meant by precision ?
Ans.-Precision is defined as the
ability of instrument to reproduce a
certain set of readings within a given
accuracy.
3.)What is the difference between
path line and stream line ?
Ans.-A path line is a curve traced by
a single fluid particle during its
motion. A stream line is an imaginary
line drawn in a flow field such that a
tangent drawn at any point on this
line represents the direction of the
velocity vector. There is no flow across
the stream line.
4.). What is the difference between
steady and unsteady flow ?
Ans.-In steady flow the velocity at a
given point does not change with
time whereas in unsteady flow it
changes with time.

1.)What is vapour pressure and when
it becomes important ?
Ans: Vapour pressure is the partial
pressure created by the vapour
molecules when evaporation takes
place within an enclosed space. It
becomes important when negative
pressures are involved.
2.). Explain absolute viscosity ?
Ans: It is the ratio of shear stress
and the gradient of velocity with
distance between a fixed plate and
moving plate (Its unit is Pa . s).
3.)What is the difference between
perfect and real fluids ?
Ans: Perfect fluids are treated as if all
tangential forces created by friction
can be ignored.
Real fluids refer to the cases in which
friction must properly be taken into
account.
4.)State Archimedes principle.
Ans: Any weight, floating or immersed
in a liquid, is acted upon by a
buoyant force equal to the weight of
the liquid displaced. This force acts
through the center of buoyancy, i.e.
the e.g. of the displaced liquid.

True Story:
In bed,its 6:00 am, if u close ur
eyes for 5 minutes,
its direct 7:45
but
in lecture its 12:30, u close ur eyes
for 5 minutes,
its stil 12:31 ..
Agree ??

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