Worksheetssolid state MCQ TEST DEFECTS
Total questions: 25
Worksheet time: 35mins
In the Schottky defect
cations are missing from the lattice and occupy the interstitial sites
equal number of cations and anions are missing
anions are missing and electrons are present their places
equal number of extra cations and electrons are present in the interstitial sites
As a result of Schottky defect
there is no effect on the density
density of the crystal increases
density of the crystal decreases
any of the above three can happen
F-centres in an ionic crystal are
lattice sites containing electrons
interstitial sites containing electrons
lattice sites that are vacant
interstitial sites containing cations
In a Solid lattice, the cation has left a lattice site and is located at an interstitial position, the lattice defect is
Interstitial defect
vacancy defect
Frenkel defect
Schottky defect
Doping of Si with P or Al increases the conductivity. the difference in the two cases is
P gives rise to extra electrons while Al gives rise to holes
P gives rise to holes while Al gives rise to extra electrons
P is metal whereas Al is a non-metal
P is conductor while Al is semiconductor
Which of the following statements is not true?
Paramagnetic substances are weakly attracted by magnetic field
Ferromagnetic substances cannot be magnetized permanently
The domains in antiferromagnetic substances are oppositely oriented with respect to each other
Pairing of electrons cancels their magnetic moment in the diamagnetic substances
A ferromagnetic substance becomes a permanent magnet when placed in a magnetic field because-
all the domains get oriented in the direction of magnetic field.
all the domains get oriented in the direction opposite to the direction of magnetic field
domains get oriented randomly
domains are not affected by magnetic field
Which type of defect has the presence of cations in the interstitial sites?
Frenkel defect
Schottky defect
Metal deficiency defect
Vacancy defect
Which of the following defects is also known as a dislocation defect?
Freckle defect
Schottky defect
Non-stoichiometric defect
Simple interstitial defect
The appearance of colour in solid alkali metal halide is generally due to:
Frenkel defect
Schottky defect
Vacancy defect
F-Centres
Compound that can exhibit Frenkel as well as Schottky defect is
AgCl
AgBr
NaCl
ZnS
A group 14 element is to be converted into n-type semiconductor by doping it with suitable impurity. To which group should this impurity belong?
Group 13
Group 12
Group 14
Group 15
What happens when Fe3O4 is heated at 850 K?
It converts into diamagnetic substance
It converts into ferromagnetic substance
it converts into paramagnetic substance
no effect
What is the effect of increasing temperature on the electrical conductivity of metals
increases
decreases
no change
can't predicted
The difference in the electrical conductivity of metals, insulators, and semiconductors can be understood in terms of
VBT
Band theory
Resonance
Hybridization
Non-stoichiometric Metal Excess defects due to interstitial cations are found in
NaCl
ZnO
ZnS
AgBr
What type of defect can arise when a solid is heated?
vacancy defect
interstitial defect
Metal excess defect
impurity defect
Which compound is added to create an impurity defect in NaCl?
AgBr
AgCl
KI
SrCl2
. What is the effect of increasing temperature on the electrical conductivity of semiconductors?
increases
decreases
no change
can't predict
B doped with Si is an example of
vacancy defect
interstitial defect
n-type semiconductor
p-type semiconductor
Amorphous solids are
solid substance in real sense
liquid in real sense
super cooled liquids
substances with definite melting point
Which of the following are not properties of solid?
They have definite mass, volume and shape
Inter molecular forces are weak
Inter molecular distances are short
They are incompresible and rigid
Solid carbon dioxide is an example of
ionic crystal
covalent crystal
metallic crystal
molecular crystal
Which of the following is not a crystalline solid?
common salt
sugar
iron
rubber
Types of Bravais lattices in 3D arrangement is
8
12
14
9
