Silicon is found in nature in the form of

The given unit cell belongs to the type:

$A$ pure crystalline substance,on being heated gradually,first forms a turbid-looking liquid and then the turbidity completely disappears. This behaviour is the characteristic of substances forming

Which one of the following is used as a piezoelectric material?

Which of the following metals expands on solidification?

Which of the following is not a characteristic of a crystalline solid?