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1. In a PN junction diode, the region where no charge carriers are present is called

A. Depletion region B. Forward bias region C. Reverse bias region D. Neutral region

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2. The working of a transistor is based on

A. Amplification B. Rectification C. Capacitor charging D. Inductive coupling

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3. What is the function of a Zener diode?

A. Voltage regulation B. Amplification C. Rectification D. Light emission

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4. In a light-emitting diode (LED), the light emitted is due to

A. Recombination of electrons and holes B. Conduction of current through a resistive material C. Fission reaction D. Fusion reaction

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5. The characteristic property of a transistor in common emitter configuration is

A. High voltage gain B. High current gain C. High power gain D. Low voltage gain

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6. Which of the following is true about a P-N junction diode?

A. It conducts only in forward bias B. It conducts only in reverse bias C. It conducts in both forward and reverse bias D. It does not conduct in any bias

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7. What is the value of potential barrier in a silicon diode?

A. 0.7 V B. 1.1 V C. 0.3 V D. 2 V

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8. Which of the following is an application of a photodiode?

A. Light sensing B. Voltage regulation C. Current amplification D. Capacitor charging

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9. A transistor is an example of

A. A three-terminal device B. A two-terminal device C. A four-terminal device D. A five-terminal device

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10. In a transistor, the middle region is called the

A. Base B. Collector C. Emitter D. Collector-Base junction

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11. What is the energy band gap of a semiconductor material?

A. 1.1 eV B. 0.7 eV C. 0.3 eV D. 2.5 eV

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12. Which material is commonly used for the construction of a transistor?

A. Silicon B. Copper C. Aluminium D. Lead

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13. In a Zener diode, the breakdown occurs in the

A. Reverse bias region B. Forward bias region C. Neutral region D. Depletion region

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14. Which of the following is used in the construction of a solar cell?

A. P-N junction diode B. Zener diode C. Photodiode D. LED

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15. In a diode, the current flow is primarily due to

A. Majority carriers B. Minority carriers C. Both majority and minority carriers D. Only holes

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16. Which of the following is a characteristic of an ideal diode?

A. Zero resistance in forward bias B. Non-zero resistance in forward bias C. Zero resistance in reverse bias D. High resistance in forward bias

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17. Which of the following is true about a transistor in the active region?

A. Emitter current is greater than collector current B. Collector current is greater than emitter current C. Base current is equal to emitter current D. Collector current is controlled by base current

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18. What is the purpose of a capacitor in a transistor amplifier circuit?

A. To block DC and pass AC B. To store energy C. To increase current D. To reduce noise

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19. The current-voltage characteristic of a diode is exponential in the

A. Forward bias B. Reverse bias C. Both forward and reverse bias D. Neither forward nor reverse bias

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20. Which type of semiconductor is used in the construction of a diode?

A. Intrinsic semiconductor B. Extrinsic semiconductor C. Superconductor D. Insulator