SAMPLE QUESTIONS
1. In the structure of diamond, carbon atoms appear at
a) 0,0,0 and $\frac{1}{2}, \frac{1}{2}, \frac{1}{2}$
b) $\frac{1}{4}, \frac{1}{4}, \frac{1}{4}$ and $\frac{1}{2}, \frac{1}{2}, \frac{1}{2}$
c) 0,0,0 and $\frac{1}{4}, \frac{1}{4}, \frac{1}{4}$
d) 0,0,0 and $\frac{3}{4}, \frac{3}{4}, \frac{3}{4}$
2. Schottky defect to crystals is observed when
a) Unequal number of cations and anions are missing from the lattice
b) Equal number of cations and anions are missing from the lattice
c) An ion leaves its normal site and occupies an interstitial site
d) Density of the crystal is increased