Code: A-04
Subject: MATERIALS AND PROCESSES
Time: 3 Hours
Max. Marks: 100
NOTE: There are 11 Questions in all.  
  • Question 1 is compulsory and carries 16 marks. Answer to Q. 1. must be written in the space provided for it in the answer book supplied and nowhere else.
  • Answer any THREE Questions each from Part I and Part II. Each of these questions carries 14 marks.
  • Any required data not explicitly given, may be suitably assumed and stated.
Some useful data :
Electron mass =
Electron charge =
Permittivity of freespace =
Planck's constant =
Velocity of light =
Q.1
Choose the correct or best alternative in the following: (2x8)
 
a. The radius of first Bohr orbit in the hydrogen atom is about		  
  (A) 0.053 (B) 0.530  
  (C) 5.31 (D) 53.10  
     
  b. Binary phase diagrams of two component systems are usually
  
  (A) two dimensional plots of temperature and pressure.
(B) two dimensional plots of temperature and composition.
(C) two dimensional plots of pressure and composition.
(D) two dimensional plots of pressure, temperature and composition.
  
     
  c. Imperfection arising due to the displacement of an ion from a regular site to an interstitial site maintaining overall electrical neutrality of the ionic crystal is called.
  
  (A) Frenkel imperfection (B) Schottky imperfection  
  (C) point imperfection (D) volume imperfection  
     
  d. The Fermi level is s  
  (A) an average value of all available energy levels.
(B) an energy level at the top of the valence band.
(C) the highest occupied energy level at 0°C.
(D) the highest occupied energy level at 0°K.

 
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