3
MCQ (Single Correct Answer)
Which of the following is an amorphous solid?
A
Graphite (C)
B
Quartz glass ( $\mathrm{SiO}_2$ )
C
Chrome alum
D
Silicon carbide (SiC)
4
MCQ (Single Correct Answer)
Which of the following arrangements shows schematic alignment of magnetic moments of antiferromagnetic substances?
A
B
C
D
5
MCQ (Single Correct Answer)
Which of the following is true about the value of refractive index of quartz glass?
A
Same in all directions
B
Different in different directions
C
Cannot be measured
D
Always zero
6
MCQ (Single Correct Answer)
Which of the following statement is not true about amorphous solids?
A
On heating they may become crystalline at certain temperature
B
They may become crystalline on keeping for long time
C
Amorphous solids can be moulded by heating
D
They are anisotropic in nature
7
MCQ (Single Correct Answer)
The sharp melting point of crystalline solids is due to ..........
A
a regular arrangement of constituent particles observed over a short distance in the crystal lattice
B
a regular arrangement of constituent particles observed over a long distance in the crystal lattice
C
same arrangement of constituent particles in different directions
D
different arrangement of constituent particles in different directions