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ISC Class XII Sample / Model Paper 2023 : Computer Science

9 pages, 26 questions, 0 questions with responses, 0 total responses,

Nilima Sarkar
Sarojini Naidu College for Women, Kolkata
B.Sc Computer Science

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SARADA EDUCARE Affiliated to ICSE - ISC TIME : 3 hrs. 1399, Laskarhat Road, Picnic Garden, Kolkata-700039 PRE-SELECTION EXAMINATION 2023-2024 SUBJECT : Computer Science CLASS : XII ( Science ) FULL MARKS:70 PART I (20 MARKS) Answer all questions While answering questions in this Part, indicate briefly your working and reasoning, Wherever required. Question 1 (a)Find the dual of the following expression : F = (x + z) . x.y + y.z + y (b) find the complement of the following code: F = xy + x y ( c )Find the expression from the given diagram: [1] [1] [1] (d) If (~P => Q) then write its: (i) Inverse (ii) Converse [1] (e ) Write the maxterm and minterm when the inputs are : x=1 , y=0 and z=1 Question 2 (a)convert the following infix notation to postfix notation : [3] A*(B+C/D) E/F (b) A Matrix P[15][10] is stored with each element acquiring 8 bytes of storage. If the base address at P[0][0] is 1400 , determine the address at P[10][7] when the matrix is stored in row major wise. [2] (c) What is Multiplexer and Encoder ? [1+1] (d)Write the logic expression of half adder and full adder. [3] Question 3 [5] The following function quiz() is a part of some class. Assume n is a positive integer , greater than 0. Answer the given questions along with dry run working. Int quiz(int n){ If(n<=1) Return n; Else Return(--n % 2) + quiz(n/10 } PART II (50 MARKS) Answer six questions in this part, choosing two questions from Section A, two from Section B and two from Section C. SECTION A Answer any two questions.

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