# Important Question- Answers of Semiconductor Physics

## MCQ on Semiconductor physics

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Basic electronics

Semiconductor diode/Semiconductor physics

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1. When a Pentavalent impurity is added to a pure semiconductor, it becomes

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2. Ripple frequency of a half-wave rectifier is

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3. Output frequency of a full wave rectifier is 50 Hz, What is input frequency

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4. Most commonly used Rectifier is

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5. allows DC but it blocks AC

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6. A semiconductor has ……….Temperature Coefficient of resistance

Negative Coefficient Means When increasing the temperature then the resistance will decrease

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7. Input frequency of a 3-phase half wave rectifier is 50hz, then output frequency is

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8. Which is impurity for an N-type material

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9. The AC component present in output voltage is called

Hint

(Indium, Boron, and Gallium have 3) Arsenic Bismuth and phosphorus have 5)

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10. Which of the following is Impurity material of valency 3

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11. Energy gap of a non-conductor is

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12. Which are responsible of Current flow in a semiconductor

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13. What is the breakdown voltage of LED?

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14. How many junctions is in a diode

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15. As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor

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16. A semiconductor is formed by……….. Bonds

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17. Which type of diode is work as a Variable Capacitor?

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18. Resistance in a diode in Forward bias is

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19. Reverse Breakdown voltage that is Fixed already in the diode

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20. The output obtained by the rectifier is

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21. Atomic no of Germanium

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22. The conductivity of a semiconductor ………..by adding impurity

(formula 0.45xVrms=0.45x 24= 10.8)

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23. A half-wave rectifier is connected with input of 24V 50hz AC, What is Output DC voltage?

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24. Which type of charge on P-type material

( For Ge energy band gap is 0.72eV)

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25. The energy band gap in silicon is.....

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26. The width of depletion layer in Reverse bias

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27. How many valance electrons are in a Pentavalent impurity?

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28. Majority carrier in N-type material

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29. What is the work of a Zener Diode ?

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30. Valance electron in a semiconductor

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31. Which of the following is not an active component

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32. Semiconductors in pure forms known as

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33.  How many diodes in the Center-tap Full wave rectifier