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ISC Class XII Board Specimen 2023 : 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: 80 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 in Section A, Section B and Section C. The intended marks for questions or parts of questions are given in brackets [ ]. --------------------------------------------------------------------------------------------------------------------- SECTION A 16 MARKS Question 1 (i) (ii) (iii) The purpose of synchronising control in a CRO is to: (a) focus the spot on the screen. (b) lock the display of the screen. (c) adjust the amplitude of the display. (d) control the intensity of the spot. For starting a D.C. motor, a starter resistor is required because: (a) it limits the speed of the motor. (b) it limits the starting current to a safe value. (c) it starts the motor. (d) this motor is not self-starting. A single phase induction motor is: (a) self-starting. (b) not self-starting. (c) self-starting with the help of an auxiliary winding. (d) None of the above. [1] [1] [1] --------------------------------------------------------------------------------------------------------------ISC SPECIMEN QUESTION PAPER 2023 1

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