(6) Burger vectors are relevant to which of the following crystalline defects?
(A) point defects,
(B) line defects,
(C) interfacial defects,
(D) bulk defects.

1. Multiple choice questions (only one correct answer for each question below): (30%) (1) Which one of the following types of stress–strain relationship best describes the behavior of brittle materials such as ceramics and thermosetting plastics: (A) elastic and perfectly plastic, (B) elastic and strain hardening, (C) perfectly elastic, (D) none of the above.

(2) The treatment in which the brittleness of martensite is reduced is called which one of the following? (A) aging, (B) annealing, (C) normalizing, (D) tempering.

(3) The Jominy end-quench test is designed to indicate which one of the following? (A) cooling rate, (B) ductility, (C) hardenability, (D) hardness.

(4) Which of the following properties is generally exhibited by amorphous solids? (A) anisotropy, (B) glass-transition, (C) equal strength of all bonds, (D) all of the mentioned.

(5) The Miller indices h, k, and l of parallel planes in a BCC lattice should satisfy which of the following X-ray diffraction reflection rules? (A) h + k + l should be even, (B) h, k, and l should all be either even or odd, (C) h, k, and l should form Pythagoras triplet, (D) all planes allow reflections.

(7) The solubility of solute in a solvent in a solid solution is governed by Hume-Rothery rules. The solubility is more if: (A) radii of solute are much smaller than that of solvent, (B) solute and solvent have a similar crystal structure, (C) solute has low valence, (D) all of the mentioned.

(8) 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.

(9) If a material is repelled in an external magnetic field then it is (A) ferromagnetic (B) diamagnetic (C) paramagnetic (D) antiferromagnetic.

(10) Which statement is incorrect regarding polymers/elastomers? (A) Thermosets are highly cross-linked polymer chains that form a three-dimensional network structure. (B) In thermosets, cross linking is not reversible； once formed, the thermosets cannot be refused or conveniently recycled. (C) Vulcanization is a process which uses nitrogen atoms to link polymer chains in rubber. (D)Thermoplastics such as polyethylene has a flexible linear chain structure (straight or branched)

40. Rapidly cool to 650°C, hold at this temperature for 3 s, rapidly cool to 398°C, hold for10 s, then quench to room temperature. The final microstructure consists of (A) ferrite and pearlite (B) bainite and martensite (C) ferrite and bainite (D) ferrite, pearlite and bainite (E) ferrite, bainite, martensite, and pearlite

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