Explore topic-wise MCQs in Materials Science.

This section includes 5 Mcqs, each offering curated multiple-choice questions to sharpen your Materials Science knowledge and support exam preparation. Choose a topic below to get started.

1.

Diffusion through grain boundaries is very fast and is called short-circuit diffusion.
Assertion: Their contribution to overall diffusion is negligible.

A. True
B. False
Answer» B. False
Discussion
2.

Predeposition and drive-in diffusion are two heat treatments used in the manufacture of integrated circuits.
Assertion: Predepostion is carried at a higher temperature than drive-in diffusion.

A. True
B. False
Answer» C.
Discussion
3.

If C is the concentration of the diffusing species at distance x from the source and time t, then according to Fick s second law (assuming diffusion coefficient, D is constant):

A. C/ x = D.( C/ t)
B. C/ t = D.( <sup>2</sup>C/ x<sup>2</sup>)
C. C/ x = D.( <sup>2</sup>C/ t<sup>2</sup>)
D. C/ t = D.( C/ x)
Answer» C. C/ x = D.( <sup>2</sup>C/ t<sup>2</sup>)
Discussion
4.

The expression J = M/(A.t), where J, M, A, & t are diffusion flux, mass of diffusing species, cross sectional area, and time respectively is:

A. incorrect
B. valid for steady-state diffusion only
C. valid for non steady state diffusion only
D. valid for both steady and non steady state diffusion
Answer» E.
Discussion
5.

In steady state diffusion, which of the following remain unchanged with time?

A. Concentration at source
B. Concentration at sink
C. Concentration profile
D. All of mentioned
Answer» E.
Discussion