Which would undergo SN
2 reaction faster in the following pair :
C H -CH -CH -Br and C H -CH-CH 6 5 2 2 6 5 3
-
Br
Answers
Explanation:
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1. Sharp break in dislocation line that is in slip plane _______________.
(a) Jog (b) Kink (c) Either jog or kink (d) None
2. Minimum number of slip systems that must be operative during plastic deformation
(a) 3 (b) 4 (c) 5 (d) 6
3. Following strengthening mechanism appliesappliesgzttsstzuddyttd to multi-phase material
(a) Grain size reduction (b) Dispersion hardening
(c) Solid solution strengthening (d) Strain hardening
4. If ASTM grain size number is 1, approximate grain diameter (in mm)
(a) 0.1 (b) 0.2 (c) 0.25 (d) 10
5. If volume fraction of spherical shaped second phase particles is 50% with radius of 3
of particles is
(a) 1 (b) 2 (c) 3 (d) 4
6. Characteristic shape of Martensite platelets
(a) Disc (b) Lenticular (c) Cylindrical (d) Spheroids
7. Recrystallization temperature of pure materials ________ (in terms of homologous temperature)
(a) 0.1 (b) 0.2 (c) 0.3 (d) 0.4
8. Example for strengthening mechanism in single-phase material
(a) Strain hardening (b) Precipitation hardening
(c) Fiber strengthening (d) Dispersion strengthening
9. Higher the degree of deformation, recrystallization temperature is
(a) Higher (b) Lower (c) No effect (d) Either higher or lower
10. Recrystallization rate varies in t