14. Semiconductor Electronics: Materials, Devices and Simple Circuits
рдЗрд╕ рдкреЗрдЬ рдкрд░ рдЖрдкрдХреЛ 14. Semiconductor Electronics: Materials, Devices and Simple Circuits рдХреЗ рд╕рднреА рдорд╣рддреНрд╡рдкреВрд░реНрдг рдмрд╣реБрд╡рд┐рдХрд▓реНрдкреАрдп рдкреНрд░рд╢реНрди (MCQ), рдкрд░реАрдХреНрд╖рд╛ рдЙрдкрдпреЛрдЧреА рдиреЛрдЯреНрд╕ рдФрд░ рдСрдирд▓рд╛рдЗрди рдХреНрд╡рд┐рдЬрд╝ рдорд┐рд▓реЗрдВрдЧреЗред рдЕрдкрдиреЗ рдЬреНрдЮрд╛рди рдХрд╛ рдкрд░реАрдХреНрд╖рдг рдХрд░рдиреЗ рдФрд░ рдмреЛрд░реНрдб/рдкреНрд░рддрд┐рдпреЛрдЧреА рдкрд░реАрдХреНрд╖рд╛ рдореЗрдВ рд╢рдд-рдкреНрд░рддрд┐рд╢рдд рдЕрдВрдХ рдкреНрд░рд╛рдкреНрдд рдХрд░рдиреЗ рдХреЗ рд▓рд┐рдП рдиреАрдЪреЗ рджрд┐рдП рдЧрдП рдореЙрдХ рдЯреЗрд╕реНрдЯ рдореЗрдВ рдЕрд╡рд╢реНрдп рднрд╛рдЧ рд▓реЗрдВред
ЁЯСЙ рдЕрдзреНрдпрд╛рдп рдХрд╛ рд╕рд╛рд░рд╛рдВрд╢ (Summary)
Dear students, in this final chapter, we will deeply study 1 extremely revolutionary and highly modern branch of physics that has literally changed the entire face of human civilization in the last 100 years: 'Semiconductor Electronics'. In the previous chapters, we studied conductors and insulators, but now we will explore a unique category of materials that lies exactly between them. Semiconductors are the hidden hearts of every single electronic gadget you see around you. Without this specific branch of physics, the digital world as we know it would simply not exist.
Instead of just cramming complex mathematical equations in closed books, if we logically connect physics with our modern daily life, it feels extremely magical. Have you ever thought deeply about how the massive computers of the past, which used to fill 1 entire big room, have now shrunk so small that they easily fit inside your tiny pocket as a smartphone? Or how exactly a slim LED bulb in your house produces so much bright light while consuming very little electricity compared to old glass bulbs? This is no magic trick, but it is 100 percent the scientific marvel of semiconductors like Silicon and Germanium. These materials allow us to control the flow of electrons with extreme precision. From the processor in your laptop to the tiny sensors in digital cameras, everything strictly relies on the unique properties of p-type and n-type semiconductors.
From the strict perspective of the upcoming NCERT and RBSE board exams, this specific chapter of physics is highly scoring and extremely important for your 100 percent success. In the board exams, not only direct theoretical questions are asked from this chapter, but excellent analytical, conceptual, and circuit-based questions on logic gates and diodes definitely appear in the final exam paper every single year without fail. In this highly exciting journey, we will 1st study the energy band theory very closely. We will scientifically learn how the gap between the valence band and the conduction band 100 percent determines whether a material will conduct electricity or not.
Moving 1 little further in the chapter, we will logically analyze the fascinating p-n junction diode. We will deeply study how joining a p-type semiconductor with an n-type semiconductor creates a depletion layer that acts like a 1-way valve for electric current. We will learn about forward biasing and reverse biasing, and how a diode can be strictly used as a rectifier to convert AC into DC. After this, we will deeply study special-purpose diodes like LEDs, Photodiodes, and Solar Cells, which are 100 percent essential for modern green energy solutions.
Finally, we will clearly understand the digital world through 'Logic Gates'. We will logically study the truth tables and symbols of OR, AND, NOT, NAND, and NOR gates. These are the basic building blocks of all digital circuits that make decisions based on 0 and 1 signals. To perfectly ensure your excellent and 100 percent strong preparation, we have meticulously selected and prepared completely accurate, high-level, and highly exam-useful objective questions (MCQs) from all these complex topics. By continuously practicing again and again, you will surely learn critical time management and massively increase your speed of solving complex questions without making even 1 single mistake.
Feature: This is 1 3-Level based unique quiz. To unlock the next level (Level 2 and 3), students must score at least 70% in the current level, making their board exam preparation 100% strong.
рдорд╣рддреНрд╡рдкреВрд░реНрдг рдкреНрд░рд╢реНрди (Important Questions)
PDF рдбрд╛рдЙрдирд▓реЛрдб рдХрд░реЗрдВрдЕрдзреНрдпрд╛рдп рдХреЗ рд╕рднреА рдкреНрд░рд╢реНрди (Revision Notes)
*рдиреЛрдЯ: рдпрд╣ рд╕реЗрдХреНрд╢рди рд░рд┐рд╡реАрдЬрди рдХреЗ рд▓рд┐рдП рд╣реИред рдЕрдкрдирд╛ рдЬреНрдЮрд╛рди рдкрд░рдЦрдиреЗ рдХреЗ рд▓рд┐рдП рдКрдкрд░ рджрд┐рдП рдЧрдП рдХреНрд╡рд┐рдЬрд╝ рдореЗрдВ рднрд╛рдЧ рд▓реЗрдВред
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Conductivity of semiconductors as temp increases:
A) Decreases | B) Increases | C) Constant | D) Zero -
Majority carriers in p-type:
A) Electron | B) Holes | C) Both | D) None -
Doping Si for n-type with:
A) Trivalent (Al) | B) Pentavalent (P) | C) Metal | D) Nothing -
Main use of p-n junction diode:
A) Amplifier | B) Rectifier | C) Oscillator | D) Transformer -
Forward bias resistance of ideal diode:
A) Infinite | B) Zero | C) Very high | D) 100 Ohm -
In Intrinsic semiconductor, ne and nh relation:
A) ne > nh | B) ne < nh | C) ne = nh | D) ne = 0 -
Energy gap largest in:
A) Conductor | B) Insulators | C) Semiconductor | D) Superconductor -
Depletion layer contains:
A) Moving electrons | B) Fixed ions | C) Free holes | D) None -
LED works in which bias?
A) Forward | B) Reverse | C) Both | D) Zero -
Main use of Zener diode:
A) Rectification | B) Voltage regulation | C) Light emission | D) None -
Region between Valence and Conduction band:
A) Forbidden gap | B) Conduction region | C) Free region | D) Zero region -
Total charge on p-type semiconductor?
A) Positive | B) Negative | C) Neutral | D) Zero -
Diodes in full wave rectifier:
A) 1 | B) 2 | C) 3 | D) 4 -
Solar cell basis:
A) Photoelectric | B) Thermionic | C) Photovoltaic | D) Magnetic -
Valency of Silicon (Si):
A) 2 | B) 3 | C) 4 | D) 5 -
Depletion layer width in Forward bias:
A) Increases | B) Decreases | C) Constant | D) Zero -
Reason for small current in Reverse bias:
A) Majority carriers | B) Minority carriers | C) External voltage | D) Temp -
Potential Barrier for Si approx:
A) 0.3 V | B) 0.7 V | C) 1.1 V | D) 5 V -
Pentavalent impurity (As) is called:
A) Donor | B) Acceptor | C) Neutral | D) Inert -
Semiconductor at 0 K behaves as:
A) Superconductor | B) Perfect Insulator | C) Conductor | D) Oscillator -
Rectifier function:
A) AC to DC | B) DC to AC | C) Decrease voltage | D) None -
Process of adding impurity:
A) Mixing | B) Doping | C) Refining | D) Broadcasting -
Bands in conductors are:
A) Overlapping | B) Far apart | C) Zero | D) Only one -
Photo-diode bias:
A) Forward | B) Reverse | C) Both | D) Zero -
Fermi level in n-type near:
A) Conduction band | B) Valence band | C) Middle | D) Infinite -
Forbidden gap Eg for Germanium (Ge):
A) 1.1 eV | B) 0.7 eV | C) 6 eV | D) 0.1 eV -
LED light color depends on:
A) Bias voltage | B) Energy gap (Eg) | C) Temp | D) Current -
Example of Acceptor impurity:
A) P | B) Sb | C) Al or B | D) As -
I-V curve of p-n junction diode is:
A) Linear | B) Non-linear | C) Circular | D) Zero -
Used to reduce 'Ripples' in rectifier output:
A) Diode | B) Filter circuit | C) Resistance | D) Transformer -
ne = 8 x 10┬╣┬│ and nh = 5 x 10┬╣┬▓. Type?
A) n-type | B) p-type | C) Intrinsic | D) Insulator -
Barrier 0.5V. Current at 0.4V forward bias?
A) Max | B) Zero (approx) | C) Constant | D) Infinite -
Max efficiency of Half-wave rectifier?
A) 40.6% | B) 81.2% | C) 100% | D) 50% -
Main current cause in Forward bias:
A) Drift | B) Diffusion | C) Both | D) None -
Current in 1k╬й Si diode at 10V forward bias (V_barrier=0.7V)?
A) 10 mA | B) 9.3 mA | C) 0.7 mA | D) 1 mA -
Zener breakdown occurs in:
A) Low doping | B) Heavily doped & thin layer | C) Forward bias | D) High temp only -
Minority carriers in n-type:
A) Electron | B) Holes | C) Neutron | D) Ion -
Electrical conductivity (╧Г) formula:
A) e(ne ┬╡e + nh ┬╡h) | B) e(ne + nh) | C) ┬╡e/┬╡h | D) ne.nh -
Thin part in Solar cell junction:
A) p-region | B) n-region (top layer) | C) Both | D) None -
Hole number on adding Boron to Silicon:
A) Increases | B) Decreases | C) Zero | D) Stable -
Dynamic resistance r formula:
A) ╬ФV / ╬ФI | B) V / I | C) ╬ФI / ╬ФV | D) V x I -
Capacitance as Reverse bias increases:
A) Increases | B) Decreases | C) Stable | D) Zero -
Main cause of Avalanche breakdown:
A) High field | B) Impact ionization | C) Doping | D) Temp -
Intrinsic semiconductor with Eg near zero looks:
A) Transparent | B) Opaque (metallic) | C) White | D) Colored -
Output ripple frequency if input is 50Hz (full wave):
A) 50 Hz | B) 100 Hz | C) 25 Hz | D) 0 Hz
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