The defect which is caused if some of the lattice points are unoccupied are called
Point defect
Lattice vacancies
Schottky defect
Frenkel defect
If the deviation occurs due to missing atoms, displaced atoms or extra atoms, the imperfection is named as
Schottry defect
Metal excess defect
In the Bragg's equation for diffraction of x rays n' represents
The number or moles
Avagadro number
A quantum number
Order of reflection
Which covalent network crystal is an exception in electrical conductivity?
silicon carbide
diamond
graphite
none of these
_______________ is the smallest fundamental repeating portion of a crystal lattice from which the crystal is built by repetition in three dimension.
Unit cell
Void
Ionic crystal
Covalent crystal
At what temperature diamond can be vapourized?
1000o C
4000oC
7000oC
400oC
Carbon atoms in a diamond crystal are in a state of
sp3 hybridization
sp2 hybridization
sp hybridization
sp2d hybridization
How many carbon atoms surrounded each carbon atom in diamond structure?
8
2
4
6
The semi conductors which exhibit conductivity due to the flow of excess negative electrons are called
p -type semiconductors
n - type semiconductors
Super conductors
Semiconductors
Which of the following allows light to pass through it?
coal
lead
