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MCQs

Total Questions : 110 | Page 2 of 11 pages
Question 11. With respect to the matrix of Al-Cu alloys, G-P zones are
  1.    coherent
  2.    incoherent
  3.    semi-coherent
  4.    chemically indistinguishable
 Discuss Question
Answer: Option A. -> coherent


-NA-


Question 12. In a binary system A-B, εAA, εBB and εAB correspond to A-A, B-B and A-B bond energies respectively. The miscibility gap will occur if
  1.    ÎµAB > 1/2 (εAA + εBB)
  2.    ÎµAB < 1/2 (εAA + εBB)
  3.    ÎµAB = 1/2 (εAA + εBB)
  4.    ÎµAB < 1/4 (εAA + εBB)
 Discuss Question
Answer: Option A. -> εAB > 1/2 (εAA + εBB)


-NA-


Question 13. As the concentration of point defects in a crystal increases, its configurational entropy
  1.    does not change
  2.    increases
  3.    initially increases and then decreases
 Discuss Question
Answer: Option C. -> initially increases and then decreases


-NA-


Question 14. Critical value of the Gibbs energy of nucleation at equilibrium temperature is
  1.    zero
  2.    infinite
  3.    positive
  4.    negative
 Discuss Question
Answer: Option B. -> infinite


-NA-


Question 15. The density and associated crystallinity for two polypropylene samples are as follows:
density, g/cm3      crystallinity, %      1.20                            50      1.44                            80Density of totally amorphous polypropylene is
  1.    0.64
  2.    0.74
  3.    0.84
  4.    0.94
 Discuss Question
Answer: Option D. -> 0.94


-NA-


Question 16. A number is as much greater than 75 as it is smaller than 117. The number is:
  1.    91
  2.    93
  3.    89
  4.    96
 Discuss Question
Answer: Option D. -> 96


-NA-


Question 17. An edge dislocation is present in α-Fe. Atomic diameter of iron atom is 0.25 nm and its shear modulus is
70 GPa.Energy (in J/m) of the dislocation is
  1.    0.5 * 10-9
  2.    1.1 * 10-9
  3.    2.2 * 10-9
  4.    4.4 * 10-9
 Discuss Question
Answer: Option C. -> 2.2 * 10-9


-NA-


Question 18. The density and associated crystallinity for two polypropylene samples are as follows:
density, g/cm3      crystallinity, %      1.20                            50      1.44                            80The percent crystallinity of polypropylene sample having a density of 1.3 g/cm3 is
  1.    54
  2.    64
  3.    74
  4.    84
 Discuss Question
Answer: Option B. -> 64


-NA-


Question 19. An edge dislocation is present in α-Fe. Atomic diameter of iron atom is 0.25 nm and its shear modulus is 70 GPa.Modulus of the Burgers vector (in nm) is
  1.    0.125
  2.    0.25
  3.    0.50
  4.    0.625
 Discuss Question
Answer: Option B. -> 0.25


-NA-


Question 20. The professor ordered to the students to go out of the class.               I                  II                           III                         IV Which of the above underlined parts of the sentence is grammatically incorrect?
  1.    I
  2.    II
  3.    III
  4.    IV
 Discuss Question
Answer: Option B. -> II


-NA-


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