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Physics ECAT Pre Engineering Chapter 6 Fluid Dynamics Online Test MCQs With Answers
Question # 1
A body is floating in a liquid. The up thrust on the body is
Choose an answer
Equal to weight of liquid displaced
Zero
Less than the weight of liquid displaced
Weight of body-weight of liquid displaced
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Question # 2
According to slok's law, drag force depends on
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Radius of the spherical body
Terminal velocity of body
Coefficient of viscosity
All of above
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Question # 3
Blood is an
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Compressible fluid
incompressible fluid
hard
none of them
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Question # 4
When weight of an object falling freely becomes equal to the drag force, then the body will move with
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increasing speed
decreasing speed
constant speed
none of them
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Question # 5
An object moving through a fluid experiences a retarding force called a
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frictional force
terminal force
opposing force
drag force
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Question # 6
Terminal velocity is the maximum velocity attained by a spherical droplet when the drag force______the weight of droplet:
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Is smaller than
Is greater than
Becomes equal to
None of these
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Question # 7
The mass of fluid passing through any cross-section per unit time is called
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electric flux
magnetic flux
mass flux
none of them
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Question # 8
In Bernoulli's theorem the relation between velocity and pressure is
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Inverse
Direct
None of the above
Both a and b
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Question # 9
The resistance offered by a fluid to a solid moving inside it is called:
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Drag force
Surface force
Viscosity
None of these
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Question # 10
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 # 11
A tube is tapered from 20 cm diameter to 2 cm diameter, the velocity at the first cross-section is 50 cm/s, then the velocity at the second cross-section is
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50 m/s
20 m/s
40 cm/s
5 cm/s
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Question # 12
The un-steady streamline flow is called
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laminar flow
turbulent flow
both of them
none of them
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Question # 13
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 # 14
When there is no internal frictional forces between the adjacent layers of fluid, then the fluid is called
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incompressible
compressible
viscous
non viscous
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Question # 15
Bernoulli's equation is applicable for
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turbulent flow
streamline flow
both (a) and (b)
all kinds of flows
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Question # 16
The property of fluids due to which they resist their own flow is called:
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Drag force
Surface tension
Viscosity
None of these
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Question # 17
Matter is made up of very tiny particles called
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Atoms
Molecules
Ions
None of these
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Question # 18
The terminal velocity of a small size spherical body of radius R moving in a fluid varies as
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R
R
2
1/R
(1/R)
2
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Question # 19
At high speed, fluid friction _____ and fuel consumption ___,:
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Increases, decreases
Increases, increases
Decreases, increases
None of these
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Question # 20
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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