10. In a simple orthorhombic crystal system, a = 2Å, b = 3Å and c = 4Å, two
lattice points are connected through a translation vector ~ T ¼ 2~ a þ 3 ~ b þ 4~ c, its
direction is:
(a) [231]
(b) [232]
(c) [233]
(d) [234]
11. In a tetragonal crystal system, a = b = 2Å and c = 3Å, two lattice points are
connected through a translation vector ~ T ¼ 3~ a þ 4 ~ b þ 5~ c, its magnitude is:
(a) 16.0Å
(b) 17.0Å
(c) 18.0Å
(d) 19.0Å
12. In a tetragonal crystal system, a = b = 2Å, and c = 3Å, two lattice points are
connected through a translation vector ~ T ¼ 2~ a þ 3 ~ b þ 4~ c, its direction is:
(a) [123]
(b) [234]
(c) [345]
(d) [456]
13. In a hexagonal crystal system, a = b = 3Å and c = 4Å, two lattice points are
connected through a translation vector ~ T ¼ 4~ a þ 3 ~ b þ 1~ c, its magnitude is:
(a) 11.50Å
(b) 12.50Å
(c) 13.50Å
(d) 14.50Å
14. In a hexagonal crystal system, a = b = 3Å, and c = 4Å, two lattice points are
connected through a translation vector ~ T ¼ 4~ a þ 3 ~ b þ 1~ c, its direction is:
(a) [431]
(b) [341]
(c) [134]
(d) [314]
15. Sides of a primitive rectangle are 4Å and 3Å, respectively. Construct another
primitive cell of equal area whose sides are 4Å and 5Å. The angle between the
new sides is:
(a) 36.90°
(b) 35.90°
(c) 34.90°
(d) 33.90°
36
1 Unit Cell Composition