Related Questions

In Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass varies as the __________ of its diameter.
A Inverse
B Square root
C Second power
D First power
Rain drops falling through atmospheric air attain limited terminal velocity, because of
A Upward thrust due to air
B Viscous force exerted by air
C Surface tension effects of water
D Force of gravity
In the Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass is __________ the fluid viscosity.
A Directly proportional to
B Inversely proportional to
C Inversely proportional to the square root of
D Independent of
The terminal velocity of a solid spherical particle falling through a stationary fluid mass in the Stoke's law range is proportional to the
A Inverse of fluid viscosity
B Square of particle size
C Difference in the densities of the particle & fluid
D All of the above
The terminal velocity of a small sphere settling in a viscous fluid varies as the
A First power of its dimeter
B Inverse of the fluid viscosity
C Inverse square of the diameter
D Square of the difference in specific weights of solid & fluid
Go and catch the falling star. Here the ‘‘falling’’ is
A an adverb
B a preposition
C an adjective
D a verb
In which of the following the friction drag is generally larger than pressure drag?
A a circular disc or plate held normal to flow
B a sphere
C a cylinder
D an airfoil
The ratio of wall drag to total drag in the Stoke's law range is
A 0.5
B 1
C $$\frac{1}{3}$$
D $$\frac{2}{3}$$
The ratio of the wall drag to the form drag in the Stoke's law range (for motion of spherical particles in a stationary fluid) is
A 0.5
B 1
C 2
D 0.33
In which of the following body shapes, the pressure drag is large compared to the friction drag?
A Stream line body
B Two dimensional body
C Bluff body
D None of these

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