Batch: 2021-2025, Unit Test(CA) – I, Paper Code: EC 402
Quiz by Santigopal Maity
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- Q1
A semiconductor is formed by ……… bonds.
Covalent
Electrovalent
None of the above
30s - Q2
A semiconductor has ………… temperature coefficient of resistance.
Positive
Zero
Negative
30s - Q3
When a pure semiconductor is heated, its resistance…………
Goes down
Goes up
Remains the same
30s - Q4
When a pentavalent impurity is added to a pure semiconductor, it becomes ………
n-type semiconductor
An intrinsic semiconductor
p-type semiconductor
An insulator
30s - Q5
Addition of trivalent impurity to a semiconductor creates many ……
Free electrons
Bound electrons
Valence electrons
Holes
30s - Q6
As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor ………
Decreases
Increases
Remains the same
30s - Q7
The random motion of holes and free electrons due to thermal agitation is called ……….
Ionization
Pressure
Diffusion
30s - Q8
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
30s - Q9
In the depletion region of a pn junction, there is a shortage of …….
Donor ions
Holes and electrons
Acceptor ions
30s - Q10
The leakage current across a pn junction is due to…………
Minority carriers
Majority carriers
30s - Q11
With forward bias to a pn junction , the width of depletion layer ………
Remains the same
Increases
Decreases
30s - Q12
At room temperature, an intrinsic semiconductor has ……….
A few free electrons and holes
Many holes only
Many free electrons only
No holes or free electrons
30s - Q13
A Zener diode has ………..
three pn junctions
one pn junction
two pn junctions
30s