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ECAT Physics Chapter 6 Fluid Dynamics Online Test MCQs With Answers
Question # 1
Blood is an
Choose an answer
Compressible fluid
incompressible fluid
hard
none of them
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Question # 2
The pressure will be low where the speed of the fluid is
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Zero
High
Low
Constant
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Question # 3
When the different streamlines cannot cross each other, then this condition is known as
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continuity condition
turbulent flow condition
steady flow condition
none of them
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Question # 4
The study of fluid in motion basically involves law of conservation of:
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Mass
Energy
Change
Both A and C
Both A and B
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Question # 5
Where the streamlines are very close to each other, the pressure will be
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low
zero
high
all of them
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Question # 6
The drag force acting on a spherical droplet of radius 10
-5
m moving with a velocity of 1 cm/sec in a fluid of velocity 5.31 x 10
-7
m/sec. The units comes out to be:
Choose an answer
10
-16
N
10
-14
N
10
-12
N
10
-10
N
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Question # 7
When a water droplet falls through air, the net force on it is
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Net force = drag force - weight
Net force = weight - drag force
Net force = drag force + weight
Net force = weight + drag force
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Question # 8
High speed meteors rushing through air reduces to ashes because of:
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Force of gravity
High resistance of air
Drag force
None of these
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Question # 9
According to the Bernoulli's theorem the pressure velocity are
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equal to each other
proportional to each other
inversely proportional to each other
none of them
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Question # 10
0.10 cm can be written as:
Choose an answer
1.0 x 10
-2
m
1.0 x 10
-3
cm
1.0 x 10
-4
cm
1. x 10
-4
m
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Question # 11
Density of fluid is defined as:
Choose an answer
Its volume to mass ratio
Product of volume and mass
Its mass of volume ratio
None of these
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Question # 12
Liquids and gasses have
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zero viscosity
non-zero viscosity
very large viscosity
very small viscosity
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Question # 13
The flow of an ideal fluid is
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streamline flow
incompressible flow
non-viscous
all of the above
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Question # 14
The direction of the streamlines is the same as the direction of the
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force
torque
velocity
weight
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Question # 15
Deep water almost runs still when surface water flow in rivers. What does it explains
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Magnus effect
Equation of continuity
Surface energy
Bernoulli's equation
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Question # 16
A person standing near the track of a fast moving train has tendency to fall towards it because of
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Vibration due to motion of train
Gravitation force of attraction between person and trains
The high speed of train
Some other effect
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Question # 17
Drag force increases if speed of the object moving through the fluid:
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Increases
Decreases
Remains constant
None of these
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Question # 18
The maximum drag force on a falling sphere is 9.8 N, it weight is
Choose an answer
1 N
9.8 N
4.9 N
Cannot be calculated
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Question # 19
Which of the following is a characteristic of an ideal fluid?
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it is non-viscous
it is incompressible
it's motion is steady
all of the above
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Question # 20
The blood pressure of a person
Choose an answer
decrease with age
increase with age
has no effect with age
none of them
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