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Atomic diffusion - Phase Transformation MCQ Questions

Atomic diffusion MCQs : Here you will find MCQ Questions related to "Atomic diffusion" in Phase Transformation. These Atomic diffusion MCQ Questions Will help you to improve your Phase Transformation knowledge and will prepare you for various Examinations like Competitive Exams, Placements, Interviews and other Entrance Exmaniations.

Question 1

Which of the following is a diffusion process whereby the random thermally-activated movement of atoms in a solid results in the net transport of atoms.

A. Atomic diffusion
B. interstitial diffusions
C. substitutional diffusions
D. interstitial and substitutional diffusions

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Question 2

oxygen, nitrogen have ________ mobilities.

A. Higher
B. Lower
C. Can be A and B
D. Depends on state

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Question 3

Which of the following atoms use the vacancy mechanism to diffuse?

A. Large atoms
B. Surface atoms
C. Substitutional atoms
D. Small interstitial atoms

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Question 4

Assume that on average an interstitial B-atom jumps 10 times per second. The distance between the plane is given by 2m. Then, calculate the coefficient of diffusion of B atoms? (In m^2/s)

A. 40/3
B. 30/3
C. 6
D. 20/3

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Question 5

The rate of transport is governed by the diffusivity and the concentration gradient.

C. Can be true or false
D. Can not say

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Question 6

In the crystal solid state, diffusion within the crystal lattice occurs by?

A. substitutional
B. interstitial
C. Both A and B
D. None of the above

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Question 7

What is the number of nearest neighbours present in FCC metals?

A. 3
B. 6
C. 9
D. 12

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Question 8

Correlation factor in interstitial diffusion is _____

A. 0
B. 1
C. -1
D. Infinity

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Question 9

Which of the following is known as self-diffusion?

A. simple diffusion
B. facilitated diffusion.
C. interstitial lattice diffusion
D. substitutional lattice diffusion

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Question 10

For a single atom in a defect-free crystal, the movement can be described by the "random walk" model.

A. Yes
B. No
C. Can be yes or no
D. Can not say

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