Question: 62. The correct option for the number of body centred unit cells in all 14 types of Bravais lattice unit cells is :
(1) 7
(2) 5
(3) 2
(4) 3
Answer: Option (4)
Explanation:
There are 14 Bravais lattices classified into seven crystal systems.
Body centred unit cells are present in only certain crystal systems.
Body centred cubic is one such lattice.
Body centred tetragonal is another lattice type.
Body centred orthorhombic is also a Bravais lattice.
Thus, the total number of body centred Bravais lattice unit cells is three.
Therefore, the correct answer is option (4).