JAC Class 12 Computer Science Question Paper 2020 with Solution

About this paper

This is the Jharkhand Academic Council (JAC) Class 12 Computer Science paper from the 2020 board examination, reproduced with an answer under every question. It carries 70 marks (pass marks 23) for three hours, and all 21 questions are compulsory. Section A is one question of 16 one-mark multiple-choice items, Section B has nine two-mark very short answers, and Section C has eight three-mark and three four-mark long answers. The questions centre on C++ programming, with further questions on Boolean algebra and logic gates, infix-to-postfix conversion, databases and networking.

Exam

JAC Class 12

Subject

Computer Science

Year

2020

Maximum marks

70

Time allowed

3 hours

Questions

21

Pages

4

Answers included

Yes

Paper pattern

• Section A

  16 marks

  Question 1 with 16 multiple-choice items, one mark each (1 × 16)

• Section B

  18 marks

  Questions 2–10, very short answer questions, two marks each (2 × 9)

• Section C

  36 marks

  Questions 11–21, long answer questions: Questions 11–18 carry three marks each and Questions 19–21 four marks each

Topics covered

• C++ tokens, operators and data types
• Functions and inline functions
• Arrays
• Encapsulation and inheritance
• Sorting and searching
• Stacks, queues and postfix notation
• Boolean algebra, minterms and maxterms
• Logic gates
• Database concepts, DBMS and DDL
• Networking devices and transmission media

Questions from this paper

1. Write the differences between a unary operator and a ternary operator.
2. Explain the concepts of minterm and maxterm.
3. What is an inline function? Write its advantages and disadvantages.
4. Write a program in C++ to find the sum of any five odd numbers.
5. Obtain the postfix notation for the infix expression (A + B) * C + D / E − F.
6. What is a logic gate? Explain the fundamental logic gates with circuit diagrams and truth tables.