For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter (d) as

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

For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter (d) as

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