For a particle settling in water at its terminal settling velocity, which of the following is true ?

Related Mcqs:

1. A particle A of diameter 10 microns settles in an oil of specific gravity 0.9 and viscosity 10 poise under Stoke’s law. A particle B with diameter 20 microns settling in the same oil will have a settling velocity ?

   A. Same as that of A
   B. One fourth as that of A
   C. Twice as that of A
   D. Four times as that of A

2. Brownian movement is prominent in the particle size range of _____________ microns in case of settling of a particle in a fluid?

   A. 2 to 3
   B. 0.01 to 0.10
   C. 200 to 300
   D. 100 to 1000

3. The terminal velocity of a small sphere settling in a viscous fluid varies as the___________________?

   A. First power of its diameter
   B. Inverse of the fluid viscosity
   C. Inverse square of the diameter
   D. Square of the difference in specific weights of solid & fluid

4. 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

5. For motion of spherical particles in a stationary fluid, the drag co-efficient in hindered settling compared to that in free settling is _______________?

   A. More
   B. Less
   C. Equal
   D. More or less, depending on the type of particle

6. Drag co-efficient in hindered settling is _____________ that in free settling?

   A. Less than
   B. Equal to
   C. Not necessarily greater than
   D. Always greater than

7. The terminal velocity of a particle moving through a fluid varies as dp n. The value of n is equal to _______________ in Stoke’s law regime?

   A. 1
   B. 0.5
   C. 2
   D. 1.5

8. 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 A., B. and C.

9. The terminal velocity of a particle moving through a fluid varies as dp n. What is the value of n’ for Newton’s law regime ?

   A. 0.5
   B. 1
   C. 1.5
   D. 3

10. 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