30. In a tetragonal crystal, the lattice parameters a = b = 2.42Å, and c = 1.74Å.
The interplanar spacing between the consecutive (101) plane is:
(a) 4.41Å
(b) 3.41Å
(c) 2.41Å
(d) 1.41Å
31. The ratio of low index interplanar spacing d 100 : d 110 : d 111 in simple cubic
(sc) crystal system is:
(a) 1 :
1 ffiffi
2
p :
1 ffiffi
3
p
(b) 1 :
ffiffi ffi
2
p :
ffiffi ffi
3
p
(c) 1 :
ffiffi ffi
2
p :
1 ffiffi
3
p
(d) 1 :
1 ffiffi
2
p :
2 ffiffi
3
p
32. The ratio of low index interplanar spacing d 100 : d 110 : d 111 in a body-centered
cubic (bcc) crystal system is:
(a) 1 :
1 ffiffi
2
p :
1 ffiffi
3
p
(b) 1 :
ffiffi ffi
2
p :
ffiffi ffi
3
p
(c) 1 :
ffiffi ffi
2
p :
1 ffiffi
3
p
(d) 1 :
1 ffiffi
2
p :
2 ffiffi
3
p
33. The ratio of low index interplanar spacing d 100 : d 110 : d 111 in a face-centered
cubic (fcc) crystal system is:
(a) 1 :
1 ffiffi
2
p :
1 ffiffi
3
p
(b) 1 :
ffiffi ffi
2
p :
ffiffi ffi
3
p
(c) 1 :
ffiffi ffi
2
p :
1 ffiffi
3
p
(d) 1 :
1 ffiffi
2
p :
2 ffiffi
3
p
34. A tetragonal crystal has the c/a ratio as 1.5. The interplanar spacing between the
consecutive (110) plane is:
(a) 0.707Å
(b) 0.607Å
(c) 0.507Å
(d) 0.407Å
35. A tetragonal crystal has the c/a ratio as 1.5. The interplanar spacing between the
consecutive (111) plane is:
(a) 0.71Å
(b) 0.61Å
(c) 0.51Å
(d) 0.41Å
174
4 Unit Cell Representations of Miller Indices