Important Question- Answers of Semiconductor Physics Leave a Comment / Electronics Multiple choice question MCQ, Uncategorized Share thisMCQ on Semiconductor physics 0% 0 votes, 0 avg 6 Created on September 15, 2022Basic electronics Semiconductor diode/Semiconductor physics 1 / 33 1. Most commonly used Rectifier is Full wave  bridge rectifier Center-tap full wave rectifier Half wave rectifier 2 / 33 2. Resistance in a diode in Forward bias is High Very high Low Zero 3 / 33 3. Ripple frequency of a half-wave rectifier is 4 times of input Half of input  Double of input Equal to input 4 / 33 4. Which are responsible of Current flow in a semiconductor Only free electron Holes and free electrons both only holes Hint ( For Ge energy band gap is 0.72eV) 5 / 33 5. The energy band gap in silicon is..... 1.72eV 0.3eV 1.12eV 0.72eV 6 / 33 6. How many junctions is in a diode both 3 2 7 / 33 7. The AC component present in output voltage is called Ripple Switching regulator Non-linear regulators None 8 / 33 8. Which type of diode is work as a Variable Capacitor? LED Tunnel Diode Varactor Diode Photo diode 9 / 33 9. A semiconductor has ……….Temperature Coefficient of resistance Positive Zero None Negative Negative Coefficient Means When increasing the temperature then the resistance will decrease Hint (formula 0.45xVrms=0.45x 24= 10.8) 10 / 33 10. A half-wave rectifier is connected with input of 24V 50hz AC, What is Output DC voltage? 12v 10.8v 9.9v 5.4v 11 / 33 11. Which type of charge on P-type material Negative Positive None of these Neutral  12 / 33 12. As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor Decreases Increases None of the above Remains the same 13 / 33 13.  How many diodes in the Center-tap Full wave rectifier 1 4 6 2 14 / 33 14. Valance electron in a semiconductor 6 4 2 8 15 / 33 15. Semiconductors in pure forms known as Extrinsic Intrinsic 16 / 33 16. Which is impurity for an N-type material Antimony Gallium Boron Silicon 17 / 33 17. Reverse Breakdown voltage that is Fixed already in the diode Zener breakdown A and B Avalanche breakdown 18 / 33 18. A semiconductor is formed by……….. Bonds Co-ordinate Covalent Ionic Electrovalent 19 / 33 19. What is the breakdown voltage of LED? 1.7V- 3.0V 0.1V-0.3V 5.0V- 7.5V 10.2V- 20.5V 20 / 33 20. Majority carrier in N-type material Both A and B Electron Holes 21 / 33 21. The output obtained by the rectifier is Pulsating DC None Pulsating AC Non-pulsating AC 22 / 33 22. Energy gap of a non-conductor is very small and vacant Very large and vacant Complete overlapped none of these 23 / 33 23. The width of depletion layer in Reverse bias Increase Decrease Constant 24 / 33 24. Which of the following is not an active component TRANSISTOR SCR  DIODE RESISTOR Hint Hint(Indium, Boron, and Gallium have 3) Arsenic Bismuth and phosphorus have 5) 25 / 33 25. Which of the following is Impurity material of valency 3 Arsenic Phosphorus Boron  Bismuth 26 / 33 26. allows DC but it blocks AC Conductor Insulator Inductor None 27 / 33 27. What is the work of a Zener Diode ? Varied current, Varied Voltage Constant current, constant voltage Varied current, Constant voltage  constant current, Varied voltage 28 / 33 28. Atomic no of Germanium 14 29 16 32 29 / 33 29. Output frequency of a full wave rectifier is 50 Hz, What is input frequency 50hz 25hz 200hz 100hz 30 / 33 30. When a Pentavalent impurity is added to a pure semiconductor, it becomes N-type semiconductor An intrinsic semiconductor P-type semiconductor An insulator 31 / 33 31. Input frequency of a 3-phase half wave rectifier is 50hz, then output frequency is 50hz 300hz      25hz 150hz      32 / 33 32. The conductivity of a semiconductor ………..by adding impurity Both      Decrease None Increase   33 / 33 33. How many valance electrons are in a Pentavalent impurity? 5 4 6 3 Your score is The average score is 28% LinkedIn Facebook Twitter 0% Restart quiz Exit Send feedback Also read Concept of Logic Gates What is Impedance (Impedance vs Resistance) Related posts:What is ThermistorAutomatic DC FAN controller circuitWhat is DIACSimple 2 LED Blinking Flasher CircuitDark sensor circuit - 4 circuitNorton theoremBest 10 electronic circuit diagram for beginners220v 50W Low Power Inverter CircuitShare this