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Online Tests
ECAT Physics Chapter 6 Fluid Dynamics Online Test MCQs With Answers
Question # 1
In case of streamed lined flow of liquid, the loss of energy is
Choose an answer
Maximum
Minimum
Infinite
equal to what is in turbulent flow
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Question # 2
Two copper balls of 1 cm and 2 cm in diameter are simultaneously dropped in the same viscous medium. The terminal velocity of bigger ball is:
Choose an answer
Not affected due to its size
Twice that of small size ball
Four times that of small size ball
1/4th of that of small size ball
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Question # 3
Fluid friction is _____ the friction between two solid surfaces:
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Greater than
Smaller than
Equal to
None of these
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Question # 4
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 # 5
Surface tension of water is reduced by adding
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Detergents
Camphor
Plastic
Both A and B
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Question # 6
The SI unit of viscosity is
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kg m
-1
s
-1
kg ms
-1
kg m
-1
s
-2
kg m
-1
s
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Question # 7
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 # 8
Fog droplets are suspended in air when their weight is balanced by:
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Force of gravity
Upward trust due to air
Surface tension
None of these
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Question # 9
When the upward drag force of the fluid becomes equal to downward force of gravity of the droplet, then its velocity:
Choose an answer
Starts increasing
Starts decreasing
Becomes constant
Is called escape velocity
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Question # 10
Two water pipes of diameters 4 cm and 8 cm are connected with a supply line. The velocity of flow of water in the pipe 4 cm diameter is
Choose an answer
1/4 times
4 times
Twice
1/2 of 8 cm diameter pipe
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Question # 11
The rain drop falling from the sky reach the ground with
Choose an answer
Constant terminal velocity
Constant gravitational acceleration
Variable acceleration
acceleration greater than g
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Question # 12
In a _____ flow, each particle of the fluid is called a streamline and different streamlines ______cross each other.
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Streamline, cannot
Turbulent, cannot
Streamline, can
None of these
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Question # 13
Which of the following options states the names of fluids in the order of increasing viscosity?
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mercury, motor oil, methanol
methanol, mercury, motor oil
motor oil, mercury, methanol
methanol, motor oil, mercury
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Question # 14
The electrical forces between the molecules of a liquid are
Choose an answer
Repulsive
Attractive
Both A and B
None
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Question # 15
Machine parts are jammed due to:
Choose an answer
Increasing in viscosity of lubricant
Decreasing in viscosity of lubricant
Decreasing in surface tension of lubricant
None of these
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Question # 16
Viscosity of water is ______ that of air but ___ that of plasma.
Choose an answer
More, more
Less, more
Less, less
More, less
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