Related Questions

The impurity atoms with which silicon should be doped to make p-type semiconductors are
A Phosphorus
B Antimony
C Boron
D Germanium
Is an element used in semiconductors whose atoms have three valence electrons.
A An acceptor
B A donor
C Germanium
D Silicon
When the difference between mass number and atomic number of atoms of two or more elements are same, the atoms are termed as
A Isomers
B Isotopes
C Isobars
D Isotones
When two semiconductors of p and n-type are brought in contact, they form p-n junction which acts like a/an
A Conductor
B Oscillator
C Rectifier
D Amplifier
The conduction of electricity, in semiconductors, takes place due to movement of
A Positive ions only
B Negative ions only
C Positive and negative ions
D Electrons and holes
With rise in temperature the resistance of semiconductors
A Decreases
B Increases
C First increases and then decreases
D Remains constant
With increase in temperature, the electrical conductivity of semiconductors
A Increases
B Decreases
C Remain constant
D Either A or B, depends on the type of semi-conductor
The impurity level in an extrinsic semiconductor is about of pure semiconductor.
A 10 atoms for 108 atoms
B 1 atom for 108 atoms
C 1 atom for 104 atoms
D 1 atom for 100 atoms
A pentavalent impurity has ___________ Valence electrons
A 3
B 5
C 4
D 6
Which of the following impurity in cast iron promotes graphite nodule formation and increases the fluidity of the molten metal?
A Silicon
B Sulphur
C Manganese
D Phosphorus

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