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# ISC Class XII Board Specimen 2011 : Computer Science Paper 1 (Theory)

9 pages, 41 questions, 37 questions with responses, 55 total responses,    1    0
 ISC 12th Indian School Certificate Examination (ISC), New Delhi
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COMPUTER SCIENCE Paper 1 (THEORY) 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 seven questions from Part-II, choosing three 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 Answer all questions While answering questions in this Part, indicate briefly your working and reasoning, wherever required. Question 1 (a) Draw the truth table to prove the proportional logic expression. a<=>b = (a => b) . (b => a) [2] (b) Determine if following wff is valid, satisfiable or unsatisfiable: (p -> q) => [~q -> (~p ^ ~q)] [2] (c) Differentiate between a tautology and a contradiction. [2] (d) Convert the following expression F(X,Y,Z) = XY+Y Z into minterms. [2] (e) Minimise F = AB + (AC) +AB C using Boolean laws. [2] Question 2 (a) What is dynamic binding? [2] (b) Convert the following infix notation to postfix : [2] A*(B/C)/((E*F)+G) (c) Define the terms Best-Case and Average-Case in complexities. [2] (d) Each element of an array arr[15][20] requires W bytes of storage. If the address of arr[6][8] is 4580 and the Base Address at arr[1][1] is 4000 , find the width W of each cell in the array arr[ ][ ] when the array is stored as Column Major Wise. [2] Define an abstract class. [2] (e) ------------------------------------------------------------------------------------------------------------------------------6 ISC Specimen Question Paper

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