49
MCQ (Multiple Correct Answer)
Which of the following features are not shown by quartz glass?
A
This is a crystalline solid
B
Refractive index is same in all the directions
C
This has definite heat of fusion
D
This is also called super cooled liquid
50
MCQ (Multiple Correct Answer)
Which of the following cannot be regarded as molecular solid?
A
SiC (silicon carbide)
B
AIN
C
Diamond
D
$\mathrm{I}_2$
51
MCQ (Multiple Correct Answer)
In which of the following arrangements octahedral voids are formed?
A
hcp
B
bcc
C
simple cubic
D
fcc
52
MCQ (Multiple Correct Answer)
Frenkel defect is also known as ........... .
A
stoichiometric defect
B
dislocation defect
C
impurity defect
D
non-stoichiometric defect
53
MCQ (Multiple Correct Answer)
Which of the following defects decrease the density?
A
Interstitial defect
B
Vacancy defect
C
Frenkel defect
D
Schottky defect