11) The centre of gravity of the volume of liquid displaced is called
a) centre of pressure
b) centre of buoyancy
c) metacentre
d) None of these
12) The ratio of the velocity of flow V to the velocity of sound in the fluid medium is known as
(a) Fraude number
(b) Mach number
(c) Newton number
(d) coefficient of viscocity
13) The velocity potential function for a source varies with distance r as
a) 1/r
b) 1/r2
c) er
d) loger
14) The viscometer of _____ type may be used for measuring viscocity of fluids.
(a) capillary tube
(b) concentric cylinder
(c) falling cylinder
(d) any of the above
15) Stream lines, streak lines and path lines are all identical in case of
a) uniform flow
b) steady flow
c) unsteady flow
d) non-uniform flow
16) If the Froude number in open channel is more than 1.0, the flow is known as
(a) subcritical
(b) critical
(c) supercritical
(d) none of the above
17) A stream function is
a) defined only for incompressible flow
b) defined for irrotational flow
c) defined when the flow is continuous
d) defined only for stead flow
18) At the critical state of flow, the specific energy in a rectangular channel is equal to ______ times
the depth of flow.
(a) 1.0
(b) 1.5
(c) 2.0
(d) 2.5
19) Froude number is the ratio of inertia force to
a) viscous force
b) surface tension force
c) gravity force
d) compressive force
20) The most efficient theoretical section to get maximum discharge for a given cross section is
(a) triangular
(b) rectangular
(c) trapezoidal
(d) circular