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CBSE Class 12 physics Important Questions Chapter 14 Electronic Devices 1 Mark Questions 1.Give the ratio of number of holes and the no. of conduction electrons in an intrinsic semiconductor. Ans.(As in intrinsic semiconductor ne = nh) 2.What type of impurity is added to obtain n-type semiconductor? Ans. Pentavalent atoms like Arsenic (As) 3.Doping of silicon with indium leads to which type of semiconductor? Ans.Indium is a trivalent impurity, thus doping of silicon with indium leads to p-type semiconductor. 4.Draw an energy level diagram for an intrinsic semiconductor? Ans.In intrinsic semiconductor (ne = nh) 5. A semiconductor has equal electron and hole concentration of. On doping with a certain impurity electron concentration increases to. Identify the type of semiconductor after doping? Ans.As ne > nh, thus resulting semiconductor is of n-type. 6.How does the energy gap of an intrinsic semiconductor vary, when doped with a trivalent impurity? Ans. When a trivalent impurity is added to an intrinsic semiconductor, an acceptor energy level is created in the forbidden energy gap which lies above the valence band. Due to this electrons easily transformed to the acceptor energy level. 7. How does width of depletion layer of p.n junction diode change with decrease in reverse bias? Ans.Decrease in reverse bias will decrease in width of the depletion layer. 8. Under what condition does a junction diode work as open switch? Ans. A junction diode works an open switch when it is reverse biased. 9. Which type of biasing gives a semiconductor diode very high resistance? Ans.Reverse biasing

    • Posted by R.L. Trivedi 3 years, 2 months ago

    CBSE > Class 12 > Physics
    • 0 answers
    ANSWER

    • Posted by Aakarsh Jain 3 years, 2 months ago

    CBSE > Class 07 > Sanskrit
    • 2 answers

    Sharda Jeph 3 years, 2 months ago

    Answer

    2Thank You

    Ayushi Sharma 3 years, 2 months ago

    Ch 1

    2Thank You

    ANSWER

    • Posted by Mohit Maheshwari 3 years, 2 months ago

    CBSE > Class 12 > English Core
    • 2 answers

    B. Rohith 3 years, 2 months ago

    The Champaran Satyagraha of 1917 was the first satyagraha movement led by Mahatma Gandhi in British India and is considered a historically important rebellion in the Indian independence movement.

    0Thank You

    Ankush Dahiya 3 years, 2 months ago

    Indigo movement of champaran is th movement to stop growing indigo presserlly by the Britishers form farmers. And Gandhi ji help Rajkumar Shukla and all other peasents who are under pressure of Britishers.

    0Thank You

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    • Posted by Vikhyaat Dhawan 3 years, 2 months ago

    CBSE > Class 09 > English Lang & Lit. (184)
    • 0 answers
    ANSWER

    • Posted by Pushpa Anjali 3 years, 2 months ago

    CBSE > Class 11 > Painting
    • 0 answers
    ANSWER

    • Posted by Sazid Sheikh 3 years, 1 month ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Preeti Dabral 3 years, 1 month ago

      1. Due to greater electronegativity of sp2 hybridised carbon to which carboxyl carbon is attached and greater resonance stabilization of carboxylate ion with the benzene ring, benzoic acid is a stronger acid than acetic acid.
      2. Methanal is more reactive towards nucleophilic addition reaction than ethanal because carbonyl carbon of methanal is more electrophilic than that of ethanol. Also, due to +I effect of methyl group in ethanal, reactivity of ethanal decreases.

    1Thank You

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    • Posted by Harshika Bossa 3 years, 2 months ago

    CBSE > Class 05 > Mathematics
    • 1 answers

    Harshika Bossa 3 years, 2 months ago

    Please give me the anwer

    2Thank You

    ANSWER

    • Posted by Ashdeep Singh 3 years, 1 month ago

    CBSE > Class 10 > हिंदी ए
    • 1 answers

    Preeti Dabral 3 years, 1 month ago

    इस कविता में कवि सुमित्रानंदन पंत जी ने पर्वतीय इलाके में वर्षा ऋतु का सजीव चित्रण किया है। पर्वतीय प्रदेश में वर्षा ऋतु होने से वहाँ प्रकृति में पल-पल बदलाव हो रहे हैं। कभी बादल छा जाने से मूसलधार बारिश हो रही थी तो कभी धूप निकल जाती है। दर्पण सा फैला है विशाल!

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    • Posted by Sai Sandeepak 3 years, 1 month ago

    CBSE > Class 05 > EVS
    • 2 answers

    Preeti Dabral 3 years, 1 month ago

    I have seen different type of houses in different areas like

    1. Houses made up of wood, which are found in hilly areas.
    2. Houses made up of wood, which are found in hilly areas.
    3. Houses made up of cement, bricks, glass, etc. that are found in cities.

    These houses are strong and can withstand heavy rains and storms, but the houses made up of mud and bamboo or of wood cannot withstand such climatic conditions.
      

    0Thank You

    Suvam Kirttania 2 years, 10 months ago

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    • Posted by Varnika Sathish 3 years, 2 months ago

    CBSE > Class 06 > Social (OLD)
    • 2 answers

    Lakshmishree Lekana 3 years, 2 months ago

    An official rule of a country or state says that what people should do

    1Thank You

    イシャントク ゲーマー 3 years, 2 months ago

    an official rule of a country or state that says what people may or may not do

    1Thank You

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    • Posted by Rishika Sonkar 3 years, 2 months ago

    CBSE > Class 06 > Computer
    • 2 answers

    Aryan Singh 3 years, 2 months ago

    Kdvud

    2Thank You

    Rishika Sonkar 3 years, 2 months ago

    You are dumb

    4Thank You

    ANSWER

    • Posted by Kusum Bhutia 3 years, 2 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Vivek Prajapati 3 years, 2 months ago

    16

    0Thank You

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    • Posted by Samujjal Sarkar 3 years, 1 month ago

    CBSE > Class 10 > English Language and Literature
    • 1 answers

    Preeti Dabral 3 years, 1 month ago

    There are many legends related to the origins of tea. The Chinese legend about tea was that there was a Chinese emperor. He always boiled water before drinking it. One day, a few leaves of the twigs burning under the pot fell into the water and gave it a delicious flavour. It is said they were tea leaves.  

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    • Posted by Ad Gamer 3 years, 2 months ago

    CBSE > Class 11 > English Core
    • 1 answers

    12345 Class 3 years, 2 months ago

    Photograph

    0Thank You

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    • Posted by Vanshika Yadav 3 years, 1 month ago

    CBSE > Class 07 > Computer
    • 1 answers

    Preeti Dabral 3 years, 1 month ago

    The keyboard is input device. The data which we want to feed into a computer may be typed on the keyboard in binary language. The other input devices are punched cards, paper tapes, magnetic tapes, magnetic discs, floppy discs, etc.

    1Thank You

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    • Posted by Gajanand Chopkar 3 years, 2 months ago

    CBSE > Class 05 > EVS
    • 0 answers
    ANSWER

    • Posted by Sunita Das 3 years, 2 months ago

    CBSE > Class 06 > Computer
    • 1 answers

    Vidhya Singh 3 years, 2 months ago

    Good evening

    1Thank You

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    • Posted by Hemant Parihar 3 years, 2 months ago

    CBSE > Class 06 > Sanskrit
    • 0 answers
    ANSWER

    • Posted by Aastha Nagar 3 years, 2 months ago

    CBSE > Class 09 > हिंदी ए
    • 0 answers
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    • Posted by Van Thangi 3 years, 2 months ago

    CBSE > Class 12 > Applied Maths
    • 2 answers

    Tanushri Bhayani 2 years, 10 months ago

    f(x)=x^5 f'(x)=5x^4 f"(x)=20x^3. (;5×4=20)

    0Thank You

    Kushal Sethi 3 years, 2 months ago

    20x^3

    1Thank You

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    • Posted by Vency Patel 3 years, 2 months ago

    CBSE > Class 09 > Social Science
    • 1 answers

    Tushar Kumar 3 years, 2 months ago

    earthquake is the shaking of the surface of the earth due to the sudden release of energy in the earth's crust

    2Thank You

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    • Posted by Nazuk Sohal 3 years, 1 month ago

    CBSE > Class 12 > Economics
    • 1 answers

    Preeti Dabral 3 years, 1 month ago

    1. China has successfully focused on Pro-poor reforms.
    2. Agrarian reforms have been effectively carried out.
    3. Export driven manufacturing has significantly grown, adding to the pace of GDP growth.
    4. SEZ policy has proved to be a boon for FDI flow in India.

    0Thank You

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    • Posted by Shailja Khaitan 3 years, 2 months ago

    CBSE > Class 10 > Mathematics
    • 3 answers

    Midhuna A 3 years, 2 months ago

    E

    0Thank You

    Vivek Prajapati 3 years, 2 months ago

    This is coincident line because. a1/a2= b1/b2=c1/c2

    1Thank You

    Simran Sinha 3 years, 2 months ago

    This pair of linear equation has no solution as both lines are parallel to each other.{a1/a2=b1/b2≠c1/c2).

    1Thank You

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    • Posted by Atshpreet Kaur Pannu 3 years, 2 months ago

    CBSE > Class 07 > Mathematics
    • 2 answers

    Prabodh Malik 3 years, 2 months ago

    1.Sum of three interior angle equal to 180 degree 2.Sum of two sides of triangle higher than third side

    0Thank You

    Teena Yadav 3 years, 2 months ago

    4

    0Thank You

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    • Posted by Chaitanya Chaitu 3 years, 2 months ago

    CBSE > Class 06 > Science (OLD)
    • 0 answers
    ANSWER

    • Posted by Mishika Pandey 3 years, 2 months ago

    CBSE > Class 04 > EVS
    • 0 answers
    ANSWER

    • Posted by Durai Raj 3 years, 2 months ago

    CBSE > Class 11 > Chemistry
    • 5 answers

    Asgar Ali 3 years, 2 months ago

    4 significant figures leading zeroes are not significant figures

    1Thank You

    Marushika P 3 years, 2 months ago

    6

    1Thank You

    Sadakshi R 3 years, 2 months ago

    4

    0Thank You

    Tnus Ror 3 years, 2 months ago

    4

    2Thank You

    Krishna Achu 3 years, 2 months ago

    4 significant figures

    3Thank You

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    • Posted by Poleboina Rishitha 3 years, 1 month ago

    CBSE > Class 11 > Physics
    • 1 answers

    Preeti Dabral 3 years, 1 month ago

    The constitution and structure of matter at the scales of atoms and nuclei and their interaction with different elementary particles

    1Thank You

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    • Posted by Someshwaran Vi 3 years, 2 months ago

    CBSE > Class 07 > German
    • 4 answers

    Daddy Da 3 years, 2 months ago

    Unsere schule heißt S.S.R.V.M

    1Thank You

    Bishnupriya Nayak 3 years, 2 months ago

    What is the name

    1Thank You

    Dorjee Tsering 3 years, 2 months ago

    Miyakhalifa

    0Thank You

    Someshwaran Vi 3 years, 2 months ago

    Unser schul heiBt KV AFS AVADI

    1Thank You

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    • Posted by Kumar Mishra 3 years, 2 months ago

    CBSE > Class 10 > Mathematics
    • 2 answers

    Umesh Chandra 3 years, 2 months ago

    Hi

    0Thank You

    Vivek Prajapati 3 years, 2 months ago

    sin/cos, 1/cot, sec/cosec, √sec^2-1

    0Thank You

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