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1
AIPMT 2008
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
With which one of the following elements silicon should be doped so as to give p-type of semiconductor?
A
Selenium
B
Boron
C
Germanium
D
Arsenic
2
AIPMT 2008
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
If $$a$$ stands for the edge length of the cubic systems: simple cubic, body centred cubic and face centred cubic, then the ratio of radii of the spheres in these systems will be respectively
A
$${1 \over 2}a:{{\sqrt 3 } \over 2}a:{{\sqrt 2 } \over 2}a$$
B
$$1a:\sqrt 3 a:\sqrt 2 a$$
C
$${1 \over 2}a:{{\sqrt 3 } \over 4}a:{1 \over {2\sqrt 2 }}a$$
D
$${1 \over 2}a:\sqrt 3 a:{1 \over {\sqrt 2 }}a$$
3
AIPMT 2008
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Percentage of free space in a body centred cubic unit cell is
A
34%
B
28%
C
30%
D
32%
4
AIPMT 2008
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Which of the following statements is not correct?
A
The number of carbon atoms in a unit cell of diamond is 4
B
The number of Bravais lattices in which a crystal can be categorized is 14
C
The fraction of the total volume occupied by the atoms in a primitive cell is 0.48.
D
Molecular solids are generally volatile.
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