Physics Question Bank: Semiconductors

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(Solution for this Chapter will be uploaded shortly)

Very Short Answers  (1 Mark)

Q1, What is the energy band?

Q2. What is breakdown of a PN junction diode?

Q3. State any two applications of a solar cell.

Q4. How are LED’s of different colours obtained?



Q5. Explain the doping levels of the three regions of a transistor.

Q6. What is a binary number system?

Q7. State the three basic gates used to perform logic functions.

Q8. What is a truth table?



Q9. What is an intrinsic semiconductor?

Q10. What is an extrinsic semiconductor?

Q11. In what region should a transistor be operated to be used as a switch?

Q12. What is an oscillator?

Q13. What is a solar cell?



Q14. What is feedback in a transistor oscillator?

Q15. What is positive feedback in a transistor oscillator?

Q16. What is negative feedback in a transistor oscillator?

 

S.A. I (2 Marks)

Q1. Explain the concept of donor impurity and acceptor impurity.



Q2. Explain the formation of a depletion layer in a PN junction diode.

Q3. Explain the formation of P-type semiconductor with suitable diagram

Q4. Explain the formation of N-type semiconductor with suitable diagram.

Q5. Distinguish between intrinsic and extrinsic semiconductor.

Q6. Explain the working of a forward biased PN junction diode.



Q7. Explain working of reverse biased PN junction diode.

Q8. Draw and explain I-V characteristics of P-N junction diode.

Q9. Draw the characteristics of a zener diode. Hence explain why it is used as a regulator in the breakdown region.

Q10. Draw a neat labelled diagram of a solar cell.



Q11. Explain V- I characteristics of a solar cell.

Q12. Draw the energy band diagram for LED.

Q13. Draw and explain the V-I characteristics of LED.

Q14. Give any four advantages of LEDs.

Q15. Explain the arrangement of LED for formation of seven- segment display unit.

Q16. Draw the circuit diagram to study NPN transistor characteristics in the C-E mode.



Q17. Draw the circuit diagram to study PNP transistor characteristics in the C-E mode

Q18. With the help of graph explain input characteristics of NPN transistor in C-E-mode.

Q19. Draw the block diagram of an oscillator.

Q20. Draw the logic diagram and write the truth table for the Boolean equation Y=A. B.



Q21. Draw the logic diagram and write the truth table for the Boolean equation Y = A + B.

Q22. Using truth table show that A + B = A . B

Q23. Using truth table show that A. B = A + B

Q24. Draw the logic diagram and write the truth table for the Boolean equation A . B.

Q25. Draw the logic diagram and write the truth table for the Boolean equation A + B.

Q26. What is feedback in an oscillator? What is negative feedback and positive feedback



SA II (3 Marks)

Q1. Explain with suitable diagram the concept of the valence band and conduction band.

Q2. With necessary circuit diagram explain the working of zener diode as a voltage regulator.

Q3. With necessary diagram explain the working of A photo diode.

Q4. Define the two current ratios of a transistor. Obtain the relation between them.

Q5. With the help of graph explain output characteristics of NPN transistor in CE mode.

Q6.  Write the formula for the voltage gain of an oscillator system. Explain the different quantities. Hence explain the Barkhausen criterion for sustained oscillations.

Q7. Draw the schematic symbol of a NOT gate. Explain its working with the help of Boolean equation and truth table.

Q8. Draw the schematic symbol of a AND gate. Explain its working with the help of Boolean equation and truth table.

Q9.  Draw the schematic symbol of a OR gate. Explain its working with the help of Boolean equation and truth table.

Q10. Draw the schematic symbol of a NAND gate. Explain its working with the help of Boolean equation and truth table.

Q11. Draw the schematic symbol of a NOR gate. Explain its working with the help of Boolean equation and truth table.

Q12. Explain with suitable diagram extrinsic semiconductor.

Q13.Draw and explain I-V characteristics of the P-N junction diode.

Q14. With the help of a neat circuit diagram explain the working of half-wave rectifier. Draw necessary waveforms.

Q15. With the help of a neat circuit diagram explain the working of a full-wave rectifier. Draw necessary waveforms.

Q16. Explain the working of LED.

Q17. Explain with diagram action of N – P – N transistor.

Q18. Explain with diagram action of P – N – P transistor.

Q19. With suitable diagram explain the working of the transistor as a switch

Q20 Write the truth table for the Boolean equation Y = A – B + A – B

Q21. With the help of a diagram, explain the construction of a solar cell.

Maharashtra State Board > Science > Physics Question Bank > Semiconductors > You are Here
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