ISC 2024 Computer Science Question Paper for Class 12

About this paper

This is ISC Class 12 Computer Science Paper 1 (Theory), code 868A, from the 2024 board examination. It carries 70 marks and three hours, plus fifteen minutes to read the paper, and it has 11 questions. Part I, worth 20 marks, is compulsory and includes multiple-choice and assertion–reason items on Boolean algebra and Java. Part II, worth 50 marks, has three sections, with any two questions from each. Section A is a recruitment truth table, Karnaugh maps and a decoder. Section B is Java: decimal to hexadecimal, insertion sort, and the ASCII codes of a word. Section C is a stack of cards, overtime pay by inheritance, and a binary tree. This copy has the questions only.

Exam

ISC Class 12

Subject

Computer Science

Year

2024

Paper code

868A

Maximum marks

70

Time allowed

3 hours + 15 min reading

Questions

11

Pages

11

Answers included

No, questions only

Paper pattern

• Part I

  20 marks

  Questions 1 and 2, all compulsory: multiple-choice and assertion–reason items, a postfix conversion and two Java methods

• Section A

  20 marks

  Questions 3–5, ten marks each; answer any two. A principal-recruitment truth table, Karnaugh maps and a 3-to-8 decoder

• Section B

  20 marks

  Questions 6–8, ten marks each; answer any two. Java classes for decimal to hexadecimal, insertion sort and ASCII codes

• Section C

  10 marks

  Questions 9–11, five marks each; answer any two. A stack of cards, overtime salary by inheritance, complexity and a binary tree

Topics covered

• Boolean algebra and duality
• Propositional logic
• Karnaugh maps
• Decoders and multiplexers
• Canonical SOP and POS forms
• Recursion
• Arrays and insertion sort
• Number systems
• Strings and ASCII
• Inheritance
• Stacks
• Binary trees and complexity

Questions from this paper

1. Convert the infix expression (P + Q * R − S) / T * U to postfix form.
2. Class DeciHex converts a positive decimal integer to hexadecimal by recursion. The decimal number 25 has hexadecimal equivalent 19.
3. Class InsSort sorts an integer array in descending order by insertion sort and returns the average of the odd numbers in the array.
4. Class Coding displays every character of a word with its ASCII code, and also the lowest and highest ASCII codes in the word.
5. To be recruited as a college principal, a candidate must be a postgraduate with a B.Ed. or more than 15 years of teaching, or an employee of that college with more than 15 years of teaching, or a postgraduate outsider with more than 15 years of teaching. Write the SOP expression for X(P, S, E, B).
6. CardGame adds and draws cards only at the top of the pile. Specify addCard and drawCard, and name the entity and the principle it uses.