1
MCQ (Single Correct Answer)
Which of the following conditions favours the existence of a substance in the solid state?
A
High temperature
B
Low temperature
C
High thermal energy
D
Weak cohesive forces
2
MCQ (Single Correct Answer)
Which of the following is not a characteristic of a crystalline solid?
A
Definite and characteristic heat of fusion
B
Isotropic nature
C
A regular periodically repeated pattern of arrangement of constituent particles in the entire crystal
D
A true solid
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