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Material Science Practice Test: Diffusion
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Diffusion topics include: Diffusion mechanisms, influential factors, steady and non-steady state diffusion. Diffusion is the movement of particles, ions, molecules, and solutions from a region of higher concentration to a region of lower concentration. It's driven by a gradient in chemical potential or Gibbs free energy.  Some examples of diffusion include: Incense and perfume sticks Balloons filled with helium Tea sachets Soda and cold beverages Breathing Pollution of the air Mineral and biomolecule transport in plants and animals  Diffusion is slightly slower in liquids than in... Show more
Material Science Practice Test: Diffusion
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25 Questions

1. Which of the following is not true for steady-state diffusion?
2. Gaussian error function in denoted as ef.
3. Carburisation is a heat treatment used for case hardening steels. Carbon is trapped on steel surface by:
4. Velocity of diffusing particles does not depend on _______
5. Which of the following law is a partial differential equation?
6. In steady state diffusion, which of the following remain unchanged with time?
7. Diffusion through grain boundaries is very fast and is called short-circuit diffusion.
Assertion: Their contribution to overall diffusion is negligible.
8. Following plot shows the concentration profile at two different time, T1 and T2 for the same non-steady diffusion process.
What is the correct relationship between the two?
9. Concentration gradient refers to:
10. 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:
11. Which of the following operator is used and on which side of Fick’s second law’s equation?
12. How is the rate of diffusion affected by the weight of diffusing atom?
13. Flux direction is opposite to the direction of the concentration gradient.
14. Diffusion is slower in polycrystalline structure than single crystalline structure.
15. In non-steady diffusion, a type of atom accumulates or depletes from a region.
16. Which of the following gases can be purified by allowing it to diffuse through palladium cap?
17. Which of the following law is used to non-steady state diffusion?
18. Which of the following will diffuse the fastest in iron?
19. Osmosis is different from diffusion as:
20. How is diffusion rate related to diffusion distance?
21. Generally, the metal-to-metal diffusion takes place by vacancy diffusion.
22. On which of the following does diffusion not depend on?
23. Which of the following is not a part of Fick’s first law?
24. The diffusivity of copper in copper increases by how many times when the temperature is increased from 500 ° C to 1000 °C?
25. In dilute aqueous solutions which of the following can be the value of diffusion coefficient at room temperature?