Molecular diffusivity of a liquid__________________?

Related Mcqs:

1. The mass diffusivity, the thermal diffusivity and the eddy momentum diffusivity are same for, NPr = NSc = _________________?

   A. 1
   B. 0.5
   C. 10
   D. 0

2. The diffusivity, DAB (for component A diffusing in B) is equal to the diffusivity DBA (for component B diffusing in A) for a binary mixture of________________?

   A. Newtonian liquids
   B. Non-Newtonian liquids
   C. Ideal gases
   D. Real gases

3. If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is____________________

   A. 0
   B. 1
   C. 1

4. According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity) ?

   A. D
   B. D2
   C. D0.5
   D. 1/D

5. The Knudsen diffusivity is proportional to (where, T = absolute temperature) ______________________?

   A. √T
   B. T2
   C. T
   D. T4

6. Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and ‘t’ is time) ?

   A. (De.t)1/2
   B. (De/t)1/2
   C. (4De/πt)1/2
   D. (4De/t)

7. The diffusivity D. in a binary gas mixture is related to the pressure (P) as___________________?

   A. D ∝ P0.5
   B. D ∝ 1/P0.5
   C. D ∝ 1/P
   D. D ∝ 1/P1.5

8. Which of the following has the same dimension as mass diffusivity ?

   A. Momentum flux
   B. Kinematic viscosity
   C. Thermal diffusivity
   D. Both B. and C.

9. Gaseous diffusivity at atmospheric pressure is of the order of _____________________ cm2/second?

   A. 1
   B. 1 to 5
   C. 5 to 10
   D. > 10

10. The dimension of diffusivity is same as that of the__________________?

    The dimension of diffusivity is same as that of the
    A. Density
    B. Molal concentration
    C. Kinematic viscosity
    D. Velocity head