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Online Tests
Physics ECAT Pre Engineering Chapter 6 Fluid Dynamics Online Test MCQs With Answers
Question # 1
The instrument which detects the instant at which external pressure becomes equal to the systolic pressure is
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stethoscope
thermometer
manometer
barometer
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Question # 2
When a fluid is in motion, its flow can be considered as
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turbulent
streamline
either or them
neither of them
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Question # 3
The law of conservation of mass gives us the
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equation of continuity
Bernoulli's theorem
both of them
none of them
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Question # 4
When the speed of a body in a fluid increases then the drag force
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decreases
becomes zero
increases
non of them
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Question # 5
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 # 6
Matter is made up of very tiny particles called
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Atoms
Molecules
Ions
None of these
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Question # 7
A body is moving through a viscous medium eventually comes to rest because of:
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Force of gravity
Force of friction
Its weight
Both A and C
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Question # 8
The velocity of falling raindrops attains limited value because of
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Up thrust of air
Air currents of the earth atmosphere
Surface tension effect
Viscous force exerted by air
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Question # 9
The _____ viscous the medium is _____, is the value of terminal velocity of the droplet:
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More, lesser
Lesser, more
Both A and B
Lesser, lesser
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Question # 10
Liquids and gasses have
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zero viscosity
non-zero viscosity
very large viscosity
very small viscosity
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Question # 11
A flowing liquid possess
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K.E
P.E
Pressure Energy
All
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Question # 12
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:
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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 # 13
Bernoulli's equation is the fundamental equation in fluid dynamics, which relates pressure to fluid
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speed
height
none of them
both of them
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Question # 14
When the droplet moves with terminal velocity in a fluid, the net force acting on the droplet is:
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F
D
-mg
Zero
mg-F
D
None of these
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Question # 15
According to Stoke's law, drag force depends on
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Initial velocity
Final velocity
Terminal velocity
Instantaneous velocity
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Question # 16
During the free fall motion of an object, when its weight becomes equal to the drag force, then it will move with
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maximum speed
zero speed
maximum speed
none of them
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