Question

Match the crystal system/unit cells mentioned in Column I with their characteristic features mentioned in Column II.
Indicate your answer by darkening the appropriate bubbles of the 4 X 4 matrix given in the ORS.

Answer 1

(A) Simple cubic and face-centred cubic unit cells have cell parameters as $a=b=c$ and $\alpha =\beta =\gamma$.
They belong to same crystal system.
(B) Cubic and rhombohedral unit cells have have cell parameters $a=b=c$ and $\alpha =\beta =\gamma$.
They are two crystal systems.
(C) Cubic and tetragonal unit cells are two crystal systems.
(D) Hexagonal and monoclinic unit cells are two crystal systems.
They have have only two crystallography angles of ${90}^o$.