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CBSE Class 12 Physics Practice Paper: Set-IX

Dec 8, 2015 13:01 IST

    Find CBSE Class 12 Physics Practice Paper (Set- IX). This paper contains important questions from 9th unit (Semiconductor Electronics) of physics. These questions will not only help the students to prepare for exams in a better manner, but will also help them in understanding the depth with which a topic should be studied.

    Few sample questions from the Question Paper are given below:

    Q. What is the direction of diffusion current in a junction diode?

    Q. Shanky was school student and used to play with his grandfather. One day, the old torch being used by his grandfather stopped working. His grandfather told him about the problem. Shanky himself made a torch using LED with a small recharge battery and gave it to his grandfather as a gift.

    Read the above passage and answer the following question:

    (i) What is LED and how it is different from other instruments producing electricity?

    (ii) What values did you observe in Shanky?

    Q. Suppose ‘n-type’ wafer is created by doping Si crystal having 5 × 1028 atoms/m3 with 1 ppm concentration of As. On the surface 200 ppm Boron is added to create ‘p’ region in this wafer. Considering ni = 1.5 × 1016 m-3,

    (i) Calculate the densities of the charge carriers in the n & p regions.

    (ii) Comment which charge carriers would contribute largely for the reverse saturation current when diode is reverse biased.

    Q. What do you understand by the term holes in a semiconductor? Explain how they move under the influence of an electric field?

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