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# ISC Class XII Board Specimen 2020 : Computer Science Paper 1

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 ISC 12th Indian School Certificate Examination (ISC), New Delhi
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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) State Associative law and prove it with the help of a truth table. [1] (b) Draw the truth table to prove the proportional logic expression. [1] (X => Y) (Y => X) = X <=> Y (c) Find the dual for the Boolean equation: AB + BC + 1 = 1. [1] (d) Convert the Boolean expression F(X,Y,Z) = X Y Z + X YZ + XYZ into its cardinal form. [1] (e) Minimize: F = XY + (XZ) +XY Z using Boolean laws. [1] Question 2 (a) Differentiate between Stack data structure and Queue data structure. [2] (b) Convert the following infix notation to postfix notation [2] A*(B/C)/E+F (c) Define Interface. How is it different from a Class? [2] ----------------------------------------------------------------------------------------------------------------------------------- 1 ISC SPECIMEN QUESTION PAPER 2020

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