Solid State - Result Question 34
####34. Match the crystal system / unit cells mentioned in Column I with their characteristic features mentioned in Column II.
($2007,6$ M)
| Column I | Column II | ||
|---|---|---|---|
| A. | Simple cubic and face centred cubic |
p. | have these cell parameters $a=b=c$ and $\alpha=\beta=\gamma=90^{\circ}$ |
| B. | Cubic and rhombohedral |
q. | are two crystal systems |
| C. | Cubic and tetragonal | r. | have only two crystallographic angles of $90^{\circ}$ |
| D. | Hexagonal and monoclinic |
s. | belong to same crystal system |
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Answer:
Correct Answer: 34. $A \rightarrow p, s ; B \rightarrow q ; C \rightarrow q ; D \rightarrow q, r$
Solution:
- A. Simple cubic and face centred cubic both have cell parameters $a=b=c$ and $\alpha=\beta=\gamma=90^{\circ}$. Also both of them belongs to same, cubic, crystal system.
B. The cubic and rhombohedral crystal system belongs to different crystal system.
C. Cubic and tetragonal are two different types of crystal systems having different cell parameters.
D. Hexagonal and monoclinic are two different crystal system and both have two of their crystallographic angles of $90^{\circ}$.
