1
AIPMT 2008
MCQ (Single Correct Answer)
+4
-1
Percentage of free space in a body centred cubic unit cell is
A
34%
B
28%
C
30%
D
32%
2
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
The fraction of total volume occupied by the atoms present in a simple cube is
A
$${\pi \over {3\sqrt 2 }}$$
B
$${\pi \over {4\sqrt 2 }}$$
C
$${\pi \over 4}$$
D
$${\pi \over 6}$$
3
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
If NaCl is doped with 10$$-$$4 mol% of SrCl2, the concentration of cation vacancies will be (NA = 6.02 $$ \times $$ 1023 mol$$-$$1)
A
6.02 $$ \times $$ 1016 mol$$-$$1
B
6.02 $$ \times $$ 1017 mol$$-$$1
C
6.02 $$ \times $$ 1014 mol$$-$$1
D
6.02 $$ \times $$ 1015 mol$$-$$1
4
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
The appearance of colour in solid alkali metal halides is generally due to
A
interstitial positions
B
F.-centres
C
Schottky defect
D
Frenkel defect
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