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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 (viii) Output from a transistor amplifier is: [1] (a) (b) (c) (d) SECTION B - 12 MARKS Answer the following questions briefly. Question 2 [2] State any two differences between half wave rectifier and full wave rectifier. Question 3 [2] Draw a neat circuit diagram of an RC filter. Question 4 [2] With reference to transistors, obtain the relationship between and (symbols have their usual meaning). Question 5 [2] What inference can be drawn by maintaining control grid at: (i) Positive potential (ii) Negative potential Question 6 [2] State any two advantages of Power Amplifier over Voltage Amplifier. 2 Question 7 (i) [2] For the Common Emitter (CE) transistor given in Figure 1(a), =45 and voltage drop across 1K resistor which is connected to the collector circuit is 1V. Calculate the base current of the transistor. Figure 1(a) OR (ii) For the Common base (CB) transistor given in Figure 1(b), the current amplification factor is 0 9. If the emitter current is 1mA, calculate the base current of the transistor. Figure 1(b) SECTION C - 20 MARKS Answer the following questions. Question 8 [4] With the help of a neat circuit diagram, explain the working of a bridge rectifier. Question 9 [4] With the help of a neat circuit diagram of a Common Emitter (CE) amplifier, explain how a weak signal can be amplified. (Use either PNP or NPN type of transistor) 3 Question 10 [4] Figure 2 given below shows a circuit diagram of a voltage stabilizer. Explain the importance of the following: (i) resistor R (ii) Zener diode Figure 2 Question 11 (i) Prove = [4] 0 2 OR (ii) Prove = 2 Question 12 [4] Explain the working of a crystal microphone. Also, state the energy conversion that takes place in this microphone. 4

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