Multiple choice questions on VISCOSITY
1) For streamline flow Reynolds
number is
a) Less than 1100 b)
greater than 2100 c) between 1100 to
2100 d) none of these
2) For turbulent flow Reynolds
number is
a) Less than 1100 b) greater than 2100 c) between 1100 to 2100 d) none of these
3) A free falling object achieves
terminal velocity if
a) Down word force of gravity acting on it equals the up word force of
drag experienced by it
b) Down word force of gravity acting on it less than the up word force
of drag experienced by it
C) Down word force of gravity acting on it greater than the up word
force of drag experienced by it
d) None of these
4) Milliken’s oil drop method used
for determination of charge of an electron make use of
a) Stokes law b) Hooks law c) Reynolds law d)
none of these
5) Settlement of fine particles in
water make use of
a) Stokes law b) Hooks law c)
Reynolds law d) none of these
6) ………. Law can be used to explain as to why do
small water droplets remain suspended in air until they grow to a critical size
and start falling as rain
a) Stokes law b) Hooks law c) Reynolds law d)
none of these
7) SI unit of coefficient of
viscosity is
a) dyne-s/cm2 b) Ns/m2 c) N/sm2
d) N m2
8) CGS unit of coefficient of
viscosity is
a) dyne-s/cm2 b) Ns/m2 c) N/sm2
d) N m2
9) The critical velocity of a
liquid is
a) ῃR / rd b) ῃ /R rd c) Rrd/ῃ d) Rd/ῃr
10) By Archimedes’ principle
buoyancy means
a) Up word thrust is equals to the loss
of weight of body in liquid
b) Up word thrust is great than to the
loss of weight of body in liquid
c) Up word thrust is less than to the loss
of weight of body in liquid
d) None of these
11) In streamline flow
a) All liquid molecules do not move in
the same direction
b)
All liquid molecules move in the same direction
c) Some liquid molecules do not move in
the same direction
d) None of these
12) In turbulent flow
a) All liquid molecules do not move in the
same direction
b) All liquid molecules move in
the same direction
c) Some liquid molecules do not move in the same direction
d) None of these
13) In the stream line flow
a) The velocity of fluid is less than the
critical velocity
b) The velocity of fluid is equal to the
critical velocity
c) The velocity of fluid is greater than
the critical velocity
d) None of these
14) In the turbulent flow
a) The velocity of fluid is less than the
critical velocity
b) The velocity of fluid is equal to the
critical velocity
c) The velocity of fluid is greater than
the critical velocity
d) None of these
15) The constant maximum velocity
of a body moving relative to a fluid such that the resultant force acting on it
is zero
a) Critical velocity b) Terminal velocity c) Zero
velocity d) None of these
16) The velocity gradient is
a) dx/dv b)
dv/dx c) dv/dt d) None of above
17) The force of viscosity depends
on
a) Area of surface in contact b) velocity gradient c) Nature and temperature of liquid d) All of these
18) Which of the following fluid
is more viscous
a) Water b) kerosene
c) glycerin d) none of these
18) Which of the following fluid
is less viscous
a) Kerosene b) paint c) glycerin d) honey
19) The viscosity of a liquid decreases
rapidly with
a) An increase in temperature b) Decrease
in temperature c) Decrease in pressure d) An increase in pressure
20) The viscosity of a gases
increases rapidly with
a) An increase in temperature b) Decrease in temperature c)
Decrease in pressure d) An increase in
pressure
