JEE PHYSICS UNIT 19
QUIZ NO 4
TOTAL QUESTIONS = 20
1. In a forward-biased diode, the current increases due to
A. Injection of majority carriers
B. Reduction in barrier potential
C. Increase in resistance
D. Decrease in current carriers
2. The function of a base in a transistor is to
A. Control the current between emitter and collector
B. Increase the current from emitter to collector
C. Decrease the current from collector to emitter
D. None of the above
3. The Zener diode is heavily doped to
A. Decrease the breakdown voltage
B. Increase the breakdown voltage
C. Increase the forward current
D. Increase the reverse current
4. The width of the depletion region in a P-N junction is largest under
A. Zero bias condition
B. Forward bias condition
C. Reverse bias condition
D. None of the above
5. In a P-N junction diode, the current conduction is due to
A. Majority carriers in forward bias
B. Majority carriers in reverse bias
C. Minority carriers in forward bias
D. Minority carriers in reverse bias
6. A P-N junction diode in forward bias acts like
A. Short circuit
B. Open circuit
C. High resistance
D. Low resistance
7. In a common-emitter transistor configuration, the output is taken across
A. Base and emitter
B. Base and collector
C. Collector and emitter
D. None of the above
8. The breakdown in Zener diodes occurs due to
A. Zener effect
B. Avalanche effect
C. Both Zener and avalanche effect
D. None of the above
9. Which of the following is a major application of a photodiode?
A. Light detection
B. Voltage regulation
C. Current regulation
D. Power amplification
10. The energy gap for a semiconductor material is typically
A. Less than 1 eV
B. More than 1 eV
C. Equal to 1 eV
D. Zero
11. The total current in a transistor is the sum of
A. Base current and emitter current
B. Base current and collector current
C. Emitter current and collector current
D. Collector current and leakage current
12. What is the function of a resistor in a diode circuit?
A. To limit the current
B. To increase the current
C. To store energy
D. To convert current to voltage
13. In a Zener diode, the breakdown voltage depends on
A. Temperature
B. Applied voltage
C. Current
D. Doping concentration
14. In an LED, the light is emitted when
A. Electrons recombine with holes
B. Photons are absorbed
C. The current is reversed
D. The base current is increased
15. The operation of a transistor is based on
A. The flow of electrons and holes
B. The movement of charge carriers
C. The property of materials to conduct current
D. The property of resistance
16. In a P-N junction, the electric field is formed due to
A. Diffusion of electrons and holes
B. Applied voltage
C. Depletion of charge carriers
D. External current
17. Which of the following is an ideal use of a diode in an electronic circuit?
A. Rectification
B. Amplification
C. Switching
D. All of the above
18. The current gain of a transistor is given by
A. Ratio of collector current to base current
B. Ratio of base current to emitter current
C. Ratio of collector current to emitter current
D. None of the above
19. Which material is used to make a diode?
A. Silicon
B. Aluminum
C. Copper
D. Magnesium
20. The purpose of a photodiode is to
A. Convert light into electrical energy
B. Increase the current in a circuit
C. Amplify weak signals
D. Regulate the voltage
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