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ISC Class XII Board Exam 2017 : Electricity and Electronics

6 pages, 60 questions, 0 questions with responses, 0 total responses,    0    0
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 the help of a neat circuit diagram, explain the working of a full wave rectifier. [4] Question 2 (a) (b) Name the component used for each of the following: (i) Filtration of electrical signal. (ii) Amplification of electrical signal. Name an element for each of the following: (i) Pentavalent atom (ii) Trivalent atom [2] [2] Question 3 Explain briefly how a zener diode works where there is increase in: (a) Load (b) I/P voltage [4] -------------------------------------------------------------------------------------------------------------------This Paper consists of 6 printed pages. 1217-866 Turn over Copyright reserved.

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