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ISC Class XII Board Exam 2018 : Electricity and Electronics

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ISC 12th
Indian School Certificate Examination (ISC), New Delhi
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ELECTRICITY AND ELECTRONICS (Maximum Marks: 100) (Time allowed: Three hours) (Candidates are allowed additional 15 minutes for only reading the paper. They must NOT start writing during this time.) --------------------------------------------------------------------------------------------------------------------Answer all questions from Part I (Compulsory) and five questions from Part II. All working, including rough work, should be done on the same sheet as, and adjacent to the rest of the answer. Mathematical tables and squared paper are provided. The intended marks for questions or parts of questions are given in brackets [ ]. --------------------------------------------------------------------------------------------------------------------PART I (40 Marks) Answer all questions. Question 1 With reference to vacuum tube diode: (a) Draw a graph of plate current (IP) verses plate voltage (VP) for any two given cathode temperatures. (b) Define the following terms: (i) Space charge region (ii) Plate resistance [4] Question 2 Explain how an n-type semiconductor can be formed. Also, state the majority and minority charge carriers in n-type semiconductors. [4] Question 3 With the help of a neat circuit diagram, explain the working of a semiconductor diode as a half-wave rectifier. [4] Question 4 Draw a neat diagram showing the construction of a crystal microphone and briefly explain its working. [4] -------------------------------------------------------------------------------------------------------------------This Paper consists of 5 printed pages and 1 blank page. 1218-866 Turn over Copyright reserved.

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