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ISC Class XII Sample / Model Paper 2024 : Computer Science

5 pages, 32 questions, 0 questions with responses, 0 total responses,

Shraman Chaudhuri
Stads, Kolkata
Nur - XII

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Page 1 of 6 PRACTICE EXAMINATION 3 CLASS-XII COMPUTER SCIENCE PAPER-1(THEORY) Time 3 hours Maximum Marks-70 Answer all questions from 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 and rough work should be done in the same sheet as the rest of the answer. The intended marks of questions or parts of questions are given in brackets [ ]. PART-I(20 marks) [Answer all the questions . While answering questions in this part, indicate briefly your working and reasoning, wherever required] Question 1 (a) Using a truth table, verify the following expression: [1] X + (Y + Z) = (X + Y) + Z Also, state the law. (b) Given, F (X, Y, Z) = (X + Y ) . (Y + Z ) [1] Write the function in the canonical product of sum form. (c) Show that the dual of P QR + PQ R + P Q R is equal to the complement of: [1] PQ R + Q. (P R + PR ) (d) Convert the following function into its canonical sum of products form: [1] F(X, Y , Z) = (0, 1, 5, 7). (e) From the logic circuit diagram given below, find the output F and simplify it. [1] Also, state the law represented by the logic diagram. Question 2 (a) (b) State the difference between an Interface and a Class. [2] Convert the following infix notation to postfix notation: [2] A+B/C*D E (c) A matrix B [10][7] is stored in the memory with each element requiring 2 bytes of storage. If the base address at B [x] [1] is 1012 and the address at B [7][3] is 1060, determine the value of x where the matrix is stored in Column Major wise. [2] (d) Write the differences between Linear Data Structure and Non-Linear Data Structure. [2] (e) How can we override a method in inheritance. [2] [5] Question 3 The following function witty ( ) is a part of some class. What will be the output of the function witty( ) when the value of n is PROJECT and the value of p is 5. Show the dry run/working: void witty (String n, int p) { if (p < 0) System.out.println(" "); else { System.out.print (n.charAt(p) + " . "); witty (n, p - 1); System.out.print (n.charAt(p)); } }

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