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ISC Class XII Board Exam 2019 : Computer Science

10 pages, 37 questions, 4 questions with responses, 4 total responses,

Sulabh Mehta
Alexandra School, Amritsar

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COMPUTER SCIENCE PAPER I (THEORY) (Maximum Marks: 70) (Time allowed: Three hours) (Candidates are allowed addilional 15 minulesfor only reading the paper. They must NOT slart wriling during this time.) Answer all questions in Part I (compulsory) and six questions from Parl-11. choosing two questions from Section-A, two from Section-Band two from Section-C. All working, including rough work, should be done on the same sheet as !he rest ofthe answer. The intended marks for queslions or parts ofquestions are given in brackets [ ]. --------------------------------------------------------------------------------------------------------------------PART I (20 Marks) Answer all questions. While a11swering questions in this Part, i11dicate briefly your working and reasoning, wherever required. Question 1 (a) Name and draw the logic gate represented by the following truth table, where A and B are inputs and X is the output. A 0 0 I I B X 0 I 0 I 0 I I 111 0 [1] = TT ( 0,2) (b) Write the canonical POS expression of: F(P, Q) (c) Find the dual of: (d) If f(A, B, C) = A'.B'.C' + A'.B.C' then find F' using De Morgan's Law. (1) (e) If A= "It is cloudy"' and B= "It is raining", then write the proposition for: (lJ X.Y + X.Y' (i) Contrapositive (ii) Converse -----------------------------------------------------------------------------------------------------This Paper consists of 10 printed pages. 1219-868A Copyright reserved. (1 J =X + 0 Turn over

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