What is true about a bcc unit cell?

Which of the following is true about a hexagonal unit cell ?

Which of the following is true about a hexagonal unit cell ?

What is true about simple cubic type of unit cells?

What is true about simple cubic type of unit cells?

What is true about simple cubic type of unit cells?

The fact that is/are true about NaCl crystal's unit cell

The fact that is/are true about NaCl crystal's unit cell

Which planes can be found in a bcc unit cell?

What is the packing efficiency of bcc lattice? If the diagonal of bcc unit cell be 8sqrt3 find the radius of the atom.