JEE PHYSICS UNIT 19
QUIZ NO 2
TOTAL QUESTIONS = 20
1. In a forward-biased PN junction, the majority carriers are
A. Electrons in N-region
B. Electrons in P-region
C. Holes in N-region
D. Holes in P-region
2. In a transistor, the current gain is represented by the symbol
A. β
B. α
C. γ
D. θ
3. The function of a diode in a rectifier circuit is to
A. Allow current in one direction only
B. Store energy
C. Increase current
D. Regulate voltage
4. A Zener diode is heavily doped in order to
A. Have a low breakdown voltage
B. Increase the reverse saturation current
C. Increase the breakdown voltage
D. Increase the forward current
5. The breakdown voltage of a Zener diode is
A. Depend on the temperature
B. Independent of temperature
C. Zero
D. Dependent on the current
6. Which of the following is a characteristic of a semiconductor diode?
A. It allows current to flow only in one direction
B. It allows current to flow in both directions
C. It does not conduct current in any direction
D. It conducts current in reverse bias only
7. In a P-N junction, the depletion region is formed due to
A. Diffusion of charge carriers
B. Drift of charge carriers
C. External electric field
D. Applied voltage
8. A transistor in common emitter configuration is used for
A. Amplification
B. Switching
C. Voltage regulation
D. Current regulation
9. The P-N junction diode is used in a solar cell to convert
A. Light energy into electrical energy
B. Electrical energy into heat
C. Heat energy into electrical energy
D. Mechanical energy into electrical energy
10. The operation of an LED is based on
A. Recombination of electron-hole pairs emitting photons
B. Electrons moving in an electric field
C. Thermal excitation of electrons
D. Photoelectric effect
11. Which of the following is true about the transistor action?
A. The base current controls the collector current
B. The collector current controls the base current
C. The emitter current controls the collector current
D. The base current is independent of the collector current
12. A silicon diode conducts when forward biased and has a potential drop of about
A. 0.7 V
B. 0.3 V
C. 1.1 V
D. 2.0 V
13. In a Zener diode, the breakdown occurs due to
A. Zener breakdown
B. Avalanche breakdown
C. Both Zener and Avalanche breakdown
D. None of the above
14. What happens when a P-N junction is forward biased?
A. The electrons move from N to P
B. The holes move from P to N
C. The depletion region widens
D. No current flows
15. The majority carriers in an N-type semiconductor are
A. Electrons
B. Holes
C. Both electrons and holes
D. None of the above
16. A P-N junction in reverse bias has
A. No current flow under ideal conditions
B. A small reverse current
C. A large reverse current
D. No change in current
17. Which of the following is a property of a P-N junction diode in reverse bias?
A. It has a high resistance
B. It has low resistance
C. It is always conducting
D. It acts like a short circuit
18. The working principle of a diode is based on
A. The property of P-N junction
B. The property of resistive materials
C. The property of capacitors
D. The property of inductive materials
19. What is the use of a capacitor in a diode rectifier circuit?
A. To filter the output
B. To amplify the signal
C. To regulate voltage
D. To store charge
20. The application of a photodiode is to
A. Convert light into current
B. Convert current into light
C. Regulate voltage
D. Amplify signals
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