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ISC XI Board Specimen 2019 : Computer Science Paper 1

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ISC 11th
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) Draw the truth table to represent a two input XOR gate. [1] (b) Verify if, (~P V P) 1 = 1 [1] (c) Differentiate between ASCII code and UNICODE. [1] (d) Minimize: F = PQ + (PR) +PQ R using Boolean laws. [1] (e) If A denotes it is cloudy and B denotes it will rain , then express the following statements in symbolic form: [1] (i) If it does not rain then it is not cloudy (ii) If it is raining then it is cloudy Question 2 (a) Define Base of number system? Give one example. [2] (b) Convert the following arithmetic expression into Java statement [2] x = (a5 + b7)/ ab (c) Define the term wff in propositional logic. Give one example. [2] ----------------------------------------------------------------------------------------------------------------------------------- 1 SPECIMEN QUESTION PAPER CLASS XI - 2019

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