1.
The frictional effect present between different
layers of a moving fluid is called its
(a)
fluidity (b) density
(c)
viscosity (d)
none of these
2.
Stoke's law holds for bodies moving through
(a)
free space (b)
horizontal plane
(c)
viscous medium (d)
air
3.
A force that opposes the motion of a body moving
through
it is called
(a)
frictional force (b) gravitational force
(c)
drag force (d)
impulsive force
4.
The rate of flow of a liquid is expressed in the
units of
(a) Nm3
s (b)
kg m3 s1
(c) m3s2
(d) m3s2
5.
Stoke's law holds for bodies when these have
(a)
any shape (b)
spherical shape
(c)
oblong shape (d) rectangular shape
5.
The co-efficient of viscosity is expressed in
the units of
(a)
kgsm-1 (b) kgm-1s–2
(c)
kgsm-2 (d)
kgm-1s-1
6.
The dimensions of co-efficient of viscosity are
(a)
ML2T-1 (b) ML-2T-1
(c)
MLT-1 (d)
ML-1T-1
7.
A rain drop falls down in air with
(a)
increasing speed and increasing acceleration
(b)
decreasing speed and increasing acceleration
(c)
increasing speed and decreasing acceleration
(d)
decreasing speed and decreasing acceleration
8.
The terminal velocity of a body falling through
a fluid
(a)
increases with increasing mass
(b)
decreases with increasing mass
(c)
is independent of its mass
(d)
is independent of its size
9.
The terminal velocity of a spherical droplet is
(a)
inversely proportional to its radius
(b)
directly proportional to its radius
(c)
directly proportional to the square of its
radius
(d)
inversely proportional to the square of its
radius
10.
A fog droplet falls vertically with an
acceleration
(a) equal to g (b)
less than g (c) equal to zero (d) greater than g
11.
Hails fall faster than rain drops due to their
(a)
greater mass
(b)
greater size
(c)
solid shape (d)
none of these
12.
A fluid is said to be ideal if it satisfies the
following conditions (a) is non-viscous
(b)
is non-viscous and in-compressible
(c)
is non-viscous, in-compressible and has steady
flow
(d)
has steady flow and is non-viscous
13.
Fluid dynamics is analogous to mechanics of
moving objects. Which of the following pairs of quantities are analogous?
Fluid dynamics – Mechanics of objects
1- Equation
of continuity Law of
conservation of mass
2- Bernoulli's
theorem Law of conservation
of energy
3- Fluidity Momentum
(a)
1 and 3 (b) 1 and 2
(c)
2 and 3 (d)
1, 2 and 3
14.
In a steady flow of water through a pipe of
non-uniform bore, its velocity at a thicker area of cross-section 0.25 m2 is 2
ms-1. At thinner cross-section of half of this area, its speed is
(a)
1 ms-1 (b) 2 ms-1
(c)
4 ms-1 (d)
8 ms-1
15.
The liquid in a perfume sprayer emerges at high
speed because of the
(a)
work done in pressing the nozzle
(b)
creation of the pressure difference
(c)
narrow size of the nozzle
(d)
smaller density of the liquid
16.
An aerofoil moves through the air and
experiences lift. Which of the following statements is / are true?
1.
Air moves faster across the top of the aerofoil
than across the bottom
2.
Air pressure below the aerofoil is greater than
above 3. The upward lift is independent of the velocity of the aerofoil
(a)
1 only (b) 1 and 2 only
(c)
2 and 3 only (d) 2 only
17.
Identify the correct answer in the light of
Bernoulli's theorem
(a)
Where the speed of the fluid is high, the
pressure will be low
(b)
Where the speed of the fluid is low, the
pressure is also low
(c)
This theorem holds for turbulent flow of the
fluid
(d)
Pressure of a fluid is independent of its speed
18.
For which body position, will the systolic blood
pressure have the least value in the body?
(a)
Standing up right (b)
Sitting relaxed
(c)
Lying horizontally (d) Standing on one's head
19.
Two boats moving parallel to each other in water
in the same direction
(a)
are moved away from each other
(b)
are pulled towards each other
(c)
continue their motion unaffected
(d)
none of these
20.
1 torr equals
(a)
13.33 Nm-2
(b)
1.333 Nm-2
(c)
133.3 Nm-2 (d) 1333 Nm-2
21.
Study of fluids in motion is called
(a)
fluid resistance (b) fluid mobility
(c)
fluid static (d)
fluid dynamics
22.
Drag force is also called
(a)
terminal force
(b)
retarding force
(c)
increased force (d)
attractive force
23.
Viscosity of air at 300 C in Nsm-2
is
(a)
0.019
10-3 (b) 0.019
105
(c)
0.019 106 (d)
0.019 107
24.
Irregular
flow of a fluid is also called
(a)
turbulent flow
(b)
laminar flow
(b)
both ‘a’ and ‘b’ (d) none of these
26.
Blood is
(a)
a compressible fluid (b)
an incompressible fluid
(c)
non-viscous fluid (d)
an ideal fluid
27.
Carburetor of a car uses
(a)
Newton’s laws (b)
Kepler’s laws
(c)
Bernoulli’s equation (d) Coulomb’s law
28.
Fluids that do not flow easily have (a) large
co-efficient of viscosity.
(b) small
co-efficient of viscosity.
(c) intermediate
co-efficient of viscosity.
(d) no
viscosity.
29.
Air blows from
(a)
high pressure to low pressure.
(b) low
pressure to high pressure.
(c) hot
regions to cold regions.
(d) cold
regions to hot regions.
31.
The term 
mv2has
the dimensions of
mv2has
the dimensions of
(a)
work (b) force
(c)
density (d)
pressure
32.
Above a certain velocity, the motion of a fluid
becomes
(a)
steady and regular (b)
unsteady and regular
(c)
steady and irregular (d) unsteady
and irregular
33.
Taller the chimney, ________ will be the
draught.
(a)
smaller (b) steadier
(c)
slower
(d)
greater
35.
The term pgh
for a liquid represent its
(a)
viscosity (b)
density
(c)
pressure (d)
fluidity
36.
Blood vessels are
(a)
rigid
(b)
non-rigid
(c)
hard (d)
flexible
37.
Sphygmomanometer is a device to measure
(a)
pulse rate (b)
red cells in blood
(c)
blood pressure (d)
blood speed
38.
The path followed by the particle of a fluid is
called
(a)
streamline path (b)
line of flow
(c)
orderly path (d) none of these
39.
In a steady flow,
(a)
the streamlines cross line of flow
(b)
the streamlines are perpendicular to the line of
flow (c) the streamlines
coincide the line of flow (d) none of these.
40.
An incompressible fluid is one in which
(a)
change of pressure does not change the
density.
(b)
change of pressure changes density of the
liquid (c) increase of
pressure produces decrease of density (d) decrease of pressure produces increase
of density
Solution to Test Chapter 6
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