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ISC Class XII Board Exam 2020 : 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 triode. [4] Question 2 (a) Name two semiconductor elements. (b) State any two properties of semiconductors. [4] Question 3 Draw a Current (I) verses Voltage (V) graph for a: (a) Forward biased diode. (b) Reverse biased diode. [4] Question 4 Define the following terms: (a) Grid cut-off voltage. (b) Peak inverse voltage. [4] ---------------------------------------------------------------------------------------------------------------This Paper consists of 5 printed pages and 1 blank page. 1220-866 Turn over Copyright reserved.

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