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# ISC Class XII Board Exam 2019 : Computer Science

10 pages, 35 questions, 0 questions with responses, 0 total responses,    0    0
 Shraman Chaudhuri Stads, Kolkata XII vaigyan
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COMPUTER SCIENCE PAPER 1 (THEORY) (Maximum Marks: 70) (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 Part I (compulsory) and six questions from Part-II, choosing two questions from Section-A, two from Section-B and two from Section-C. All working, including rough work, should be done on the same sheet as the rest of the answer. The intended marks for questions or parts of questions are given in brackets [ ]. --------------------------------------------------------------------------------------------------------------------PART I (20 Marks) Answer all questions. While answering questions in this Part, indicate 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 1 1 B 0 1 0 1 [1] X 0 1 1 0 (b) Write the canonical POS expression of: F(P, Q) = ( 0,2 ) [1] (c) Find the dual of: [1] (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: [1] X.Y + X.Y = X + 0 (i) Contrapositive (ii) Converse --------------------------------------------------------------------------------------------------------------------This Paper consists of 10 printed pages. 1219-868A Turn over Copyright reserved.

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