Engineering Sciences
GATE XE Classification and Structure of Materials PYQs
Build your understanding with focused practice from past exam papers.
Questions 21–30 of 40. Imported answers require independent review unless marked reviewed.
Question 3
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The most favoured slip system in face centered cubic metal is
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Fe - 10 atom % C austenite (fcc), having no Fe vacancies, has a lattice parameter of 4 Å. The density of austenite in g cm
is ________ (round off to 2 decimal places)(Given: atomic weight of Fe = 55.8; atomic weight of C = 12.0; Avogadro’s number = 6.023 × 10²³)
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Following diagram shows a square 2-D lattice with a hexagonal motif (dark colored). The rotational symmetry element that must be present in the system is:
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The variation of molar volume (Vm) of a liquid showing glass transition temperature (Tg) while cooling from its melting temperature (Tm) is depicted by:
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Find the correct match between polymer name in Column I and the monomer type in Column II.
Column I
(I) Polyethylene
(II) Polypropylene
(III) Polyvinyl chloride
(IV) Polystyrene
Column II
(P) alkene with H and CH₃ substituents
(Q) alkene with H and Cl substituents
(R) alkene with H and C₆H₅ substituents
(S) alkene with H substituents
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Consider a FCC structured metal with lattice parameter a = 3.5 Å. If the material is irradiated using X-rays of wavelength λ = 1.5405 Å, the Bragg angle (2θ) corresponding to the fourth reflection will be:
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The number of Schottky defects per mole of KCl at 300 °C under equilibrium condition will be:
Given:
Activation energy for the formation of Schottky defect = 250 kJ.mol⁻¹
Avogadro number = 6.023 × 10²³ mol⁻¹
Universal Gas Constant = 8.314 J.K⁻¹.mol⁻¹
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For a FCC metal, the ratio of surface energy of surface to surface is ______ (round-off to two decimal places). Assume that only the nearest neighbor broken bonds contribute to the surface energy.
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In NaCl, the substitution of a Na
ion by a Ca
ion would most probably lead toYour answerChoose one option.
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A monochromatic X-ray beam of wavelength 0.154 nm is incident on a cubic crystal having lattice parameter a = 0.245 nm. The diffraction angle (2θ) for the first order reflection from a set of planes represented by the schematic plane below is _____ degrees. (round off to 1 decimal place)
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