CH-18 Electronics Leave a Comment / By abdulslambsn@gmail.com / October 6, 2025 Welcome To Your Quiz "CH-18 Electronics" Click on "Start Quiz" To Continue... 1. Which one of the following is not semi conductor: Silicon Copper Gallium arsenide Germinium None 2. The process of doping causes the resistivity of semi conductor to: Decrease Remains constant Increase None of these None 3. Holes are exist in: Conductors Semi conductors Insulators All of the above None 4. There is no current due to holes in good electrical conductors because they have: Large forbidden energy gap No valance electron Overlapping valance and conduction band None of these None 5. The crystal of germinium or silicon in its pure form at room temperature acts as: Insulator Conductor Semi-conductor None of these None 6. The impurity in the germinium is usually in the ratio of: 1:10⁶ 1:10⁴ 1:10⁸ 1:10¹⁰ None 7. A potential difference is developed across the depletion region of P-n junction due to: Negative ions Positive ions Both positive and negative ions None of these None 8. The semi conductor diode has the property of: Two way conduction Zero conduction One way conduction Amplification None 9. Semi conductors with donor atoms and free electrons belong to the type: n p Both n and p Any of the above None 10. Which one of the following has the greatest energy gap: Conductor Semi conductor Insulator None of these None 11. The forward current through a semi-conductor diode circuit is due to: Electrons Holes Majority carriers Minority carriers None 12. In half wave rectification, the output DC voltage is obtained across the load for: The negative half cycle of input AC The positive half cycle of input AC Both the input of AC None of the above None 13. Conversion of alternating current into direct current is called: Modulation Amplification Oscillation Rectification None 14. The potential difference across depletion region in case of Ge is: 0.3 volt 0.7 volt 0.6 volt 0.8 volt None 15. The number of LEDs required to display all the digits is: Seven Five Six Eight None 16. A diode, which can turn current ON and OFF in nanosecond is called: Photo voltaic cell Light emitting diode Photo diode None of these None 17. A single photovoltaic cell produces a current of: 0.9 v 0.6 v 0.5 v 6.0 v None 18. The specially designed semi conductor diodes used as indicator lamps in electronic circuits are: The switch The light emitting diode The photodiode The solar cells None 19. When P -type of p-n junction connected to positive end and N-type of the junction connected to the negative terminal of the battery then the junction is: Revere biased Forward biased Neutral None of these None 20. If positive terminal of the battery is connected to n-type and negative terminal is connected to p- type then diode is: Forward biased Reverse biased Zero biased Not biased None 21. A transistor has: Two region One region Three region Four region None 22. The basic condition for a transistor amplifier circuit is: The base- emitter junction should be forward biased The base emitter junction should be reverse biased The base collector junction should be forward biased None of these None 23. In the transistor schematic symbol the arrow is: Located on the base Located on the collector Located on the emitter None of these None 24. The emitter and base has concentration of impurity: Less Zero Greater None of these None 25. Which one of the following device based on p-n junction: Photodiode Light emitting diode Photovoltaic cell All of the above None 26. The central region of n-p-n transistor is known as: Base Collector Emitter None of the above None 27. When light emitting diode is forward biased, it emits light of colour: Yellow Green Red All of the above None 28. The operational- amplifier is so called because it was some times used to perform mathematical operations: Chemically Electronically Electrically Mechanically None 29. To use an op-amp as an inverting amplifier, the terminal which is grounded is the: Inverting terminal Non inverting terminal Output terminal None of these None 30. The open loop gain of an op- amplifier is of the order of: 10³ 10⁴ 10⁶ 10⁵ None 31. A system which deals with quantities or variables which have only two discrete values or states is known as: Binary system Logic gate Number system Digital system None 32. A circuit which has two or more input signals and which delivers an output only when every input signal is energetic is known as: OR gate NOT gate AND gate NOR gate None 33. The gate will recognize the voltage as 1 or 0 if the voltage applied to the gate is: 3.5 volt 0.5 volt 5.5 volt 7.5 volt None 34. The gate, which performs the operation of invasion is called: NOT gate AND gate OR gate XOR gate None 35. If both the inputs given to a gate are 0 such that the output is 1 then it is: NAND gate NOR gate XN,OR gate All of these None 36. Width of depletion region is: 10⁻⁸ m 10⁻⁷ m 10⁻⁶ m 10⁻⁴ m None 37. Breakdown voltages is: 25 V 15 V 35 V 5 V None 38. In case of common emitter amplifier, phase difference between input and output: 0⁰ 120⁰ 180⁰ 90⁰ None 39. A piece of copper and another of germanium are cooled from room temperature to 80 K. The resistance of: Each of them increases Each of them decreases Copper increases and that of germanium decreases Copper increases and that of germanium decreases None 40. The electrical conductivity of a semiconductor increases if electromagnetic radiation of wavelength shorter than 2066 nm is incident on it. The band gap energy[in eV] for the semiconductor is very nearly equal to: 0.5 0.6 0.8 1.2 None 1 out of 8 Thanks For Taking This Quiz - Please See Your Answers/Results Below After Entering Your Name & Email... Name Email Time's up
