JAC Class 12 Computer Science Question Paper 2015 with Solution

About this paper

This is the Jharkhand Academic Council (JAC) Class 12 Computer Science paper from the 2015 board examination, with an answer under every question. Question 1 has 16 multiple-choice parts on C++, inheritance, queues, binary search, normalisation, gates and the internet. Questions 2 to 10 are very short: data hiding, sizes of character constants, stacks and queues, second and third normal forms, a truth table and a modem. Questions 11 to 21 are longer and include polymorphism, a STUDENT class, an electricity-bill program, postfix evaluation of 120, 45, 20, +, 25, 15, −, +, *, bubble and selection sort, SQL on a STUDENT table, a K-map and the components of a network. Marks and time are not printed.

Exam

JAC Class 12

Subject

Computer Science

Year

2015

Questions

21

Pages

3

Answers included

Yes

Paper pattern

• Group A

  Question 1 with 16 multiple-choice parts

• Very short answers

  Questions 2–10

• Long answers

  Questions 11–21: programs, stacks, sorting, SQL, a K-map and networking

Topics covered

• C++ basics, keywords and loops
• Constructors, inline functions and inheritance
• Data hiding and encapsulation
• Stacks, queues and linked lists
• Searching and sorting
• Normalisation
• Boolean algebra and K-maps
• SQL
• Polymorphism
• Networking and modems

Questions from this paper

1. Differentiate between data hiding and encapsulation.
2. What will be the sizes of the constants '\a', "A\a" and "JAC-2015\a"?
3. Describe the similarities and differences between queues and stacks.
4. What is polymorphism? Give an example to show its implementation in C++.
5. An electricity board charges Rs. 3 per unit for the first 100 units, Rs. 4 per unit for the next 200 units and Rs. 6 per unit beyond 300 units, plus a meter charge of Rs. 50. Write a C++ program to read the units consumed and print the charges.
6. Evaluate the postfix expression 120, 45, 20, +, 25, 15, −, +, * using a stack.