Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity?

For a non-spherical particle, the sphericity

A

Is defined as the ratio of surface area of a sphere having the same volume as the particle to the actual surface area of the particle

B

Has the dimension of length

C

Is always less than 1

D

Is the ratio of volume of a sphere having the same surface area as the particle to the actual volume of the particle

Sphericity of a cubical particle, when its equivalent diameter is taken as the height of the cube, is

A

0.5

B

1

C

$$\sqrt 2 $$

D

$$\sqrt 3 $$

The sphericity of a solid particle of cubical shape is

A

$$\pi $$

B

$${\left( {\frac{\pi }{6}} \right)^{\frac{1}{3}}}$$

C

$${\left( {\frac{\pi }{6}} \right)^{\frac{1}{2}}}$$

D

$$\frac{\pi }{3}$$

If S is the sum of three angles of a spherical triangle, the spherical excess equals

A

S - 90°

B

S - 180°

C

S - 270°

D

S - 360°

The potential energy of a particle falling through a straight shaft drilled through the earth (assumed homogenous and spherical) is proportional to (where r is the distance of’the particle from centre of the earth)

A

log r

B

r

C

r²

D

$$\frac{1}{{\text{r}}}$$

Sphericity of raschig ring (whose length and diameter are equal) is

A

>1

B

1

C

2

Reciprocal of sphericity is termed as the

A

Specific surface ratio

B

Shape factor

C

Sauter diameter

D

Surface area per unit mass

Sphericity of pulverised coal is

A

1

B

>1

C

∞

For raschig rings, the sphericity is

A

0.5

B

1

C

$$\sqrt 3 $$

There are five persons sitting on a bench. Blue eyed lady sitting in the middle is my mother. At the extreme left, the man with grey hair is my maternal uncle. Lady sitting at the extreme right is having a pimple on her nose and is the wife of person who is sitting between blue eyed lady and grey haired man and has a pointed nose. A lady having marks on her face is the younger sister of the blue eyed lady and sitting on the remaining fifth place. The person having a pointed nose is the son of the blue eyed lady. What is the lady having marks on her face to the man sitting at extreme left ?

A

Wife

B

Maternal Aunt

C

Sister

D

Sister-in-law

Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity?

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