Related Questions

In conductors conduction of electricity takes place due to movement of
A Electrons only
B Positive ions only
C Negative ions only
D Positive and negative ions
The electricity bill of a certain establishment is partially fixed and partially varies as the number of units of electricity consumed. Wen in a certain month 540 units are sonsumed. the bill is TK 1800. In another month 620 units are consumed are the bill is Tk 2040. Inayet another month if 500 units are consumed what would be the bill (in Tk) for that month?
A 1950
B 1560
C 1840
D 1680
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
Is an element used in semiconductors whose atoms have three valence electrons.
A An acceptor
B A donor
C Germanium
D Silicon
The impurity atoms is semiconductors
A Inject more charge carriers
B Reduce the energy gap
C Increase the kinetic energy of valence electrons
D All of the above
With rise in temperature the resistance of semiconductors
A Decreases
B Increases
C First increases and then decreases
D Remains constant
The impurity atoms with which silicon should be doped to make p-type semiconductors are
A Phosphorus
B Antimony
C Boron
D Germanium
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
Heat conduction in gases is due to
A Elastic impact of molecules
B Movement of electrons
C EM Waves
D Mixing of gases
The current due to electron flow in conduction band is the hole current in valence band.
A Equal to
B Less than
C Greater than
D Any of the above

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