Multiple Choice Questions (MCQ)
1. For a bcc crystal structure, the ratio of sin
2
h values corresponding to two
consecutive diffracting principal planes will be :
(a) 0.25 Å
(b) 0.50 Å
(c) 0.75 Å
(d) 1.00 Å
2. For an fcc crystal structure, the ratio of sin
2
h values corresponding to two
consecutive diffracting principal planes will be :
(a) 0.25 Å
(b) 0.50 Å
(c) 0.75 Å
(d) 1.00 Å
3. The powder pattern of an unknown cubic metal was obtained by using CuKa
radiation in an X-ray diffractometer. The XRD pattern showed initial eight lines
with 2h values of 32.2, 44.4, 64.6, 77.4, 81.6, 98.0, 110.6 and 115.0 degrees.
The lattice parameter is found to be:
(a) 4.09 Å
(b) 5.09 Å
(c) 6.09 Å
(d) 7.09 Å
4. The ratios of ðh
2
þ k
2
þ l
2
Þ obtained as 3 : 8 : 11 : 16 : 19 for allowed
reflections correspond to:
(a) SC
(b) BCC
(c) FCC
(d) DC
5. The ratios of ðh
2
þ k
2
þ l
2
Þ obtained as 1 : 2 : 3 : 4 : 5 : 6 : 8 : 9 : 10 for allowed
reflections correspond to:
(a) SC
(b) BCC
(c) FCC
(d) DC
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9 Determination of Crystal Structure Parameters