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ISC Class XII Board Exam 2019 : 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 Explain the construction of a vacuum diode. [4] Question 2 Briefly explain what is the effect of temperature on semiconductors: (a) at absolute zero. (b) above absolute zero. [4] Question 3 With the help of a neat circuit diagram, explain the working of a semiconductor diode, as a full-wave rectifier (using two diodes). [4] Question 4 Draw the symbol used for each of the following and label its parts: (a) Triode valve. (b) Transistor (pnp or npn). [4] -------------------------------------------------------------------------------------------------------------------This Paper consists of 4 printed pages. 1219-866 Turn over Copyright reserved.

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