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# ISC Class XII Board Specimen 2022 : Electricity and Electronics [Semester 2]

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 ISC 12th Indian School Certificate Examination (ISC), New Delhi
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ISC SEMESTER 2 EXAMINATION SPECIMEN QUESTION PAPER ELECTRICITY AND ELECTRONICS ---------------------------------------------------------------------------------------------------Maximum Marks: 40 Time allowed: One and a half hour Candidates are allowed an additional 10 minutes for only reading the paper. They must NOT start writing during this time. --------------------------------------------------------------------------------------------------------------------- Answer all questions in Section A, Section B and Section C. The intended marks for questions or parts of questions are given in brackets. [ ] --------------------------------------------------------------------------------------------------------------------- SECTION A - 8 MARKS Question 1 (i) The emitter of a transistor is _____________ doped (lightly, heavily) [1] (ii) State whether the statement given below is True or False. The value of of a transistor is more than 1. [1] (iii) Define voltage gain of a Common Emitter (CE) amplifier. [1] (iv) With reference to Power Amplifier, what is meant by impedance matching. [1] (v) With reference to vacuum tubes, state the importance of cathode bypass capacitor. [1] (vi) If a triode has a mutual conductance of 1 5mA/V and plate resistance of 12K , calculate its amplification factor. [1] (vii) The base-emitter junction of a transistor, has _____________. [1] (a) a reverse bias (b) a wide depletion layer (c) low resistance (d) low conductance 1

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