Q.1
Frenkel defect is also known as
  • Metal Deficiency Defect
  • Impurity Defect
  • Metal Excess Defect
  • Dislocation Defect
Q.2
Analysis shows that nickel oxide has the formula Ni0.98O1.What fractions of nickel exist as Ni ions?
  • 86%
  • 96%
  • 4%
  • 14%
Q.3
ZnO turns yellow on heating. Why ?
  • Metal excess defect due to extra cation in the interstitial sites.
  • Metal excess defect due to anion vacancy.
  • Metal deficiency defect.
  • Frenkel defect.
Q.4
AB AB … type close packing pattern represents
  • HCP
  • FCC
  • CCP
  • BCC
Q.5
Density of a crystal is given by the formula
  • a3MZNA\frac{a^3M}{ZN_A}ZNA​a3M​
  • NAMZa3\frac{N_AM}{Za^3}Za3NA​M​
  • ZMa3NA\frac{ZM}{a^3N_A}a3NA​ZM​
  • a3NAZM\frac{a^3N_A}{ZM}ZMa3NA​​
Q.6
An example for Network solid
  • Corundum
  • Diamond
  • Dry Ice
  • KCl
Q.7
A semiconductor material
  • Ga
  • As
  • Ge
  • Al
Q.8
Defect causing decrease in density
  • Schottky
  • Frenkel
  • F- centre
  • Metal Excess
Q.9
An amorphous solid
  • CaCl2
  • NaCl
  • Glass
  • CsCl
Q.10
P-type semiconductors are formed when Silicon or Germanium is doped with Group
  • 13
  • 14
  • 12
  • 15
Q.11
Anionic sites occupied by unpaired electrons are called
  • F Centres
  • Interstitial Centres
  • Cationic Centres
  • Anionic Centres
Q.12
Defect shown by ionic crystals with large difference in size
  • Schottky Defect
  • Impurity Defect
  • Frenkel Defect
  • Metal Deficiency Defect
Q.13
Crystal showing both Schottky & Frenkel defect
  • AgBr
  • ZnO
  • AgI
  • NaCl
Q.14
Crystalline solids are
  • Isotropic
  • Allotropic
  • Anisotropic
  • Isomorphic
Q.15
The wrong statement about Para magnetism
  • They are weakly attracted by a magnetic field
  • They are magnetized in a magnetic field in the same direction
  • They keep their magnetism in the absence of magnetic field
  • It is due to the presence of one or more unpaired electrons
Q.16
Number of atoms per unit cell in a Face Centered Cubic lattice
  • 4
  • 1
  • 2
  • 6
Q.17
There are ……….. Bravais lattices corresponding to 7 different Crystal Systems
  • 8
  • 9
  • 14
  • 13
Q.18
In a primitive unit cell atoms are present at the
  • Corners & Centers of any 2 opposite sides
  • Corners only
  • Corners and Body Centre
  • Corners & Centers of all faces
Q.19
Smallest repeating unit of crystal lattice
  • Lattice site
  • Unit cell
  • Crystal lattice
  • Lattice point
Q.20
Crystal system characterized by a ≠ b≠ c and α = β = γ = 90o
  • Hexagonal
  • Ortho rhombic
  • Tetragonal
  • Triclinic
0 h : 0 m : 1 s