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1.
The statement that, "The crystals of same substance can have different shapes depending upon the number and size of faces but the angle between the corresponding faces remains constant" is known as :
2.
Frenkel defect is noticed in :
3.
A solid 
has the 
ions arranged as below. If the 
ions occupy half of the tetrahedral sites in the structure. The formula of solid is :
has the ions arranged as below. If the ions occupy half of the tetrahedral sites in the structure. The formula of solid is :
4.
Crystalline solids have :
5.
A solid has a bcc structure. If the distance of closest approach between the two atoms is 1.73
. The edge length of the cell is :
. The edge length of the cell is :
6.
The number of octahedral sites in a cubical close pack array of 
sphere is :
sphere is :
7.
What is the coordination number of body centred cube?
8.
Which of the following statements are true?
9.
The coordination number of 
in
is
in is
10.
Number of atoms per unit cell of bcc is