Bissoy.com
Doctors Medicines MCQs Q&A

What is the gradation index for a spherical shaped particle?

What is the gradation index for a spherical shaped particle? Correct Answer 0.5

The gradation index value ranges from 0.3 to 0.5 and it depends on the shape of the particle. The sediment analysis is done on the basis of Stoke’s law, which assumes spherical particles. The gradation index for spherical particles if found to be 0.5.

Related Questions

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?
Sphericity for a non-spherical particle is given by (where, V and S are volume and surface area respectively of one particle. and, D = equivalent diameter of particle).
Sphericity for a non-spherical particle is given by (where, V and S are volume and surface area respectively of one particle and D = equivalent diameter of particle).
N solid metallic spherical balls are melted and recast into a cylindrical rod whose radius is 3 times that of a spherical ball and height is 4 times the radius of a spherical ball. The value of N is: 
A spherical ball of radius 14 cm is melted and recast into small spherical balls of radius 7 cm each, in this process 20% of the material waste, then find how many complete small spherical balls can be made?
A metal spherical ball was melted and formed into three spherical balls, such that the radii of the two balls was 50% and 80% of the radius of the original ball. If 2% of the metal remained, then the radius of the third spherical ball is what percentage of the radius of the original ball?
There are 3 spherical balls whose radius are 1/2 cm, 1/3 cm, 1/4 cm and melted to form a new spherical ball. What is the radius of new spherical ball?
If 3 spherical balls having radius 6 cm, 8 cm and 10 cm respectively are melt together to form a big spherical ball. What is the total surface area of the big spherical ball?
If 3 small spherical balls having radius 3 cm, 4 cm, and 5 cm melt together to form a big spherical ball. What is the radius of big spherical ball?
The mass of particle A is double the mass of particle B and the charge on both the particles is equal. If both the particles are moving perpendicular to the magnetic field B with equal speed, then the ratio of the magnetic force on particle A to particle B will be: