Diffusion Mechanisms – 1 MCQ’s

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This set of Materials Science Multiple Choice Questions & Answers (MCQs) focuses on “Diffusion Mechanisms – 1″.

1. Concentration gradient refers to:
a) Change of concentration with respect to time
b) Change of concentration with respect to space
c) Change of concentration with respect to temperature
d) None of the mentioned

2. Interstitial diffusion is generally faster than diffusion by vacancy mode. This is because:
a) Number of interstitial sites is greater than vacancies
b) Vacancy diffusion requires more energy than interstitial diffusion
c) Interstitial species are smaller than substitution species
d) All of the mentioned

3. Diffusion is the result of:
a) Random motion of particles
b) Concentration gradient
c) Kinetic energy of particles
d) All of the mentioned

4. As the temperature rises, the rate of vacancy diffusion in metals:
a) increases
b) decreases
c) remains the same
d) may increase or decrease

5. Osmosis is different from diffusion as:
a) Diffusion requires semi-permeable membrane
b) Osmosis requires a liquid solvent
c) Osmosis is a form of active transport
d) In osmosis, solute moves from lower concentration to higher

6. Diffusion is not used in which of the following?
a) Doping of semiconductors
b) Manufacturing of alloys
c) Heat treatment of metals
d) Catalysis

7. Generally, the metal-to-metal diffusion takes place by vacancy diffusion.
a) True
b) False

8. Rate of solid-state diffusion does not depend on which of the following?
a) Temperature
b) Diffusing species
c) Host solid
d) Gravity

9. Carburisation is a heat treatment used for case hardening steels. Carbon is trapped on steel surface by:
a) Osmosis
b) Interstitial diffusion
c) Vacancy diffusion
d) None of the mentioned

10. You want to demonstrate the phenomenon of diffusion to a group of school kids using two coloured gases. For this, you need to slow down the process. Which of the following tricks will help you achieve this feat?
a) Cooling the gases
b) Using gases of large molecular weights
c) Decreasing the size of orifice
d) All of the mentioned

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