Online Quiz ā Semiconductor Electronics
Class 12 Physics | NCERT Based | EDU Bright Pages
Chapter:
Semiconductor Electronics
Questions:
20 MCQs
Level:
Board + Competitive
Time:
10 Minutes
Q1. Barrier potential of a silicon pān junction at room temperature is:
0.3 V
0.7 V
1.1 V
0 V
Q2. Depletion region in a pān junction is formed due to:
Recombination of electrons and holes
Diffusion only
Drift of carriers
External field
Q3. Direction of electric field in depletion region is:
n-side to p-side
p-side to n-side
Both
None
Q4. Increase in doping concentration causes depletion width to:
Decrease
Increase
Remain same
Become zero
Q5. A semiconductor diode is a:
Unidirectional device
Bidirectional device
Amplifier
Oscillator
Q6. Reverse saturation current in a diode is due to:
Minority carriers
Majority carriers
Ions
Holes only
Q7. Threshold voltage of germanium diode is approximately:
0.3 V
0.7 V
1.1 V
0 V
Q8. Breakdown in a diode occurs due to:
Zener/Avalanche effect
Heating only
Recombination
Diffusion
Q9. Efficiency of half-wave rectifier is nearly:
40%
60%
80%
100%
Q10. Output frequency of half-wave rectifier is:
f
2f
f/2
Zero
Q11. Full-wave rectifier converts:
Both half cycles
One half cycle
DC only
None
Q12. Number of diodes in bridge rectifier is:
4
2
1
0
Q13. Efficiency of full-wave rectifier is about:
81%
40%
60%
100%
Q14. Ripple factor of full-wave rectifier is:
Lower than half-wave
Higher than half-wave
Zero
Infinite
Q15. In intrinsic semiconductor, electrons and holes are:
Equal in number
Unequal
Zero
Only electrons
Q16. Doping is the process of:
Adding impurity
Heating semiconductor
Cooling
Removing carriers
Q17. Majority carriers in n-type semiconductor are:
Electrons
Holes
Ions
Protons
Q18. Trivalent impurity produces:
p-type semiconductor
n-type semiconductor
Conductor
Insulator
Q19. Minority carriers in p-type semiconductor are:
Electrons
Holes
Ions
Protons
Q20. Conductivity of semiconductor increases with temperature because:
More electron-hole pairs are generated
Energy gap increases
Ions move faster
None
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