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For the following questions answer them individually
Dynamic viscosity of most of the gases with rise in temperature
increases
decreases
remains unaffected
unpredictable
The resultant of all normal pressures acts
at c.g. of body
at centre of pressure
vertically upwards
at metacentre
A body floats in stable equilibrium
when its metacentric height is zero
when the metacentre is above c.g.
when its c.g. is below its centre of buoyancy
metacentre has nothing to do with position of c.g. for determining stability
Metacentre is the point of intersection of
vertical upward force through c.g. of body and center line of body
buoyant force and the center line of body
mid-point between c.g. and center of buoyancy
All of these
The two important forces for a floating body are
buoyancy, gravity
buoyancy, pressure
buoyancy, inertial
inertial, gravity
The normal stress is same in all directions at a point in a fluid
only when the fluid is frictionless
only when the fluid is incompressible and has zero viscosity
when there is no motion of one fluid layer relative to an adjacent layer
irrespective of the motion of one fluid layer relative to an adjacent layer
An ideal flow of any fluid must satisfy
Pascal law
Newton's law of viscosity
boundary layer theory
continuity equation
The flow in which the velocity vector is identical in magnitude and direction at every point, for any given instant, is known as
one dimensional flow
uniform flow
steady flow
turbulent flow
Two dimensional flow occurs when
the direction and magnitude of the velocity at all points are identical
the velocity of successive fluid particles, at any point, is the same at successive periods of time
the magnitude and direction of the velocity do not change from point to point in the fluid
the fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane
The upper surface of a weir over which water flows is known as
crest
nappe
sill
weir top
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