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- 1. Multiple Choice
A semiconductor has generally ……………… valence electrons.
2
3
6
4
- 2. Multiple Choice
The forbiddenn energy gap for Germanium is of the order of
(a) 0.7 eV
(b) 0.3 eV
(c) 1.1 eV
(d) 10 eV
- 3. Multiple Choice
Which of the following is a pentavalent impuity added while forming an extrinsic semiconductor ?
Boron
Arsenic
Indium
Gallium
- 4. Multiple Choice
Doping of Semiconductors
materials which can conduct electricity better than insulator, but not as well as conductors.
The process of adding of a certain amount of specific impurities atoms in the pure semiconductor.
when 4 electrons in outermost orbit.
- 5. Multiple Choice
The process of adding an impurity to an intrinsic semiconductor is called
Doping
Ionization
Recombination
Atomic modification
- 6. Multiple Choice
The minority carriers in P-type silicon are called _________________
Neutron
Proton
Electron
Hole
- 7. Multiple Choice
During formation of p-n junction
an electron diffuses from n to p side
a hole diffuses from p to n side
a hole diffuses from n to p side
an electron diffuses from p to n side
- 8. Multiple Choice
Which is not one of the properties of semiconductor?
4 electrons in outermost orbit, in covalent bonding.
atoms vibrate causes electron to break free from the bonds.
Electron free leaves hole.
Semiconductor has 2 types of charge carriers.
all of the above are the properties of it
- 9. Multiple Choice
Which among these is NOT a semiconductor
Germanium
Silicon
Gallium Arsenide
Titanium
- 10. Multiple Choice
Electrons and holes are equal in magnitude but opposite in polarity
True
False
- 11. Multiple Choice
An n type semiconductor is negatively charged
True
False
- 12. Multiple Choice
The forbidden energy gap for Silicon is of the order of
0.7 eV
0.3 eV
1.1 eV
10 eV
- 13. Multiple Choice
Who contribute to the current in a semiconductor
electrons only
holes only
negative ions
both electrons and holes
- 14. Multiple Choice
When a pentavalent impurity is added to a pure semiconductor, it becomes ………
An insulator
An intrinsic semiconductor
p-type semiconductor
n-type semiconductor
- 15. Multiple Choice
Addition of trivalent impurity to a semiconductor creates many ……..
Holes
Free electrons
Valence electrons
Bound electrons
- 16. Multiple Choice
The battery connections required to forward bias a pn junction are ……
+ve terminal to p and –ve terminal to n
-ve terminal to p and +ve terminal to n
-ve terminal to p and –ve terminal to n
None of the above
- 17. Multiple Choice
With forward bias to a pn junction , the width of depletion layer ………
Decreases
Increases
Remains the same
None of the above
- 18. Multiple Choice
At room temperature, an intrinsic semiconductor has ……….
Many holes only
A few free electrons and holes
Many free electrons only
No holes or free electrons
- 19. Multiple Choice
The term bias in electronics usually means ……….
the value of ac voltage in the signal.
the condition of current through a pn junction.
the value of dc voltages for the device to operate properly.
None of the above
- 20. Multiple Choice
The battery connections required to reverse bias a pn junction are ……
+ve terminal to p and –ve terminal to n
-ve terminal to p and +ve terminal to n
-ve terminal to p and –ve terminal to n
+ve terminal to p and +ve terminal to n
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