CBSE Class 12 Physics Electronic Devices Frequently Asked Questions

CBSE Class 12 Physics Electronic Devices Frequently Asked Questions. There are many more useful educational material which the students can download in pdf format and use them for studies. Study material like concept maps, important and sure shot question banks, quick to learn flash cards, flow charts, mind maps, teacher notes, important formulas, past examinations question bank, important concepts taught by teachers. Students can download these useful educational material free and use them to get better marks in examinations.  Also refer to other worksheets for the same chapter and other subjects too. Use them for better understanding of the subjects.

ELECTRONIC DEVICES

1. How is a p-type semiconductor formed? Name the majority carriers in it. Draw the energy band diagram of a p-type semiconductor.

2. How is an n-type semiconductor formed? Name the majority carriers in it. Draw the energy band diagram of a n-type semiconductor.

3. With the help of a diagram, show the biasing of a light emitting diode (LED). Give its two advantages over conventional incandescent mps.

4. Draw a circuit diagram to show how a photodiode is biased. Draw its characteristic curves for two different illumination intensities.

5. Give the logic symbol for an AND gate. Draw the output wave form for input wave forms for this gate.

6. What is rectification? How can a diode valve be used as half wave rectifier and full wave rectifier?

7. Explain how the depletion layer and the barrier potential are formed in a p-n junction diode.

8. Draw a circuit diagram for use of NPN transistor as an amplifier in common emitter configuration. The input resistance of a transistor is On changing its base current by, the collector current increases by 2 m A. If a load resistance of is used in the circuit, calculate (i) the current gain & (ii) voltage gain of the amplifier

9. The output of an AND gate is connected to both the inputs of a NAND gate. Draw the logic circuit of this combination of gates and write its truth table.

10. What is a Zener diode? How it is symbolically represented? With the help of a circuit diagram, explain the use of Zener diode as a voltage stabilizer.

11. With the help of a suitable diagram, explain the formation of depletion region in a p-n junction. How does its width change when the junction is: (i) forward biased? & (ii) reverse biased?

12. Explain briefly with the help of a circuit diagram how V-I characteristics of a p-n junction diodeare obtained in: (i) forward bias & (ii) reverse bias.

13. Explain the function of base region of a transistor. Why this region is made thin and lightlydoped? Draw a circuit diagram to study the input and the output characteristics of n-p-n transistor in a common emitter (CE) configuration. Show these characteristics graphically. Explain how current amplification factor of the transistor is calculated using output characteristics.

14. Draw the energy bands of p-type and n-type semiconductors. Explain with a circuit diagram the working of a full wave rectifier.

15. Explain with the help of a circuit diagram the use of an n-p-n transistor as an amplifier in common emitter configuration. Draw the input and output wave forms of the signal. Write the expression for its voltage gain.

16. What is an n-p-n transistor? How does it differ from p-n-p transistor? Give their symbols. Explain transistor action. 

Please click the link below to download CBSE Class 12 Physics Electronic Devices Frequently Asked Questions.