HISSAN CENTRAL EXAMINATION 2081 (2025)
Grade: XII Time: 2 hrs
F.M.: 50
COMPUTER SCIENCE (4281 M1)
Candidates are required to give their answers in their own
words as far as practicable.
Multiple Choice Questions.
GROUP A
Writes the best alternative.
[9×1=9]
1.Which database language is used for defining schema structures?
a)DML b)DDL
c)DCL d)TCL
ans: b)DDL
2. Which of the following operations are used to extract
data from a
database?
a)SELECT b)DELETE
c)UPDATE d)INSERT
ans: a)SELECT
3. Which of the following is NOT a valid PHP data type?
a)String b)Float
c)Character d)Boolean
ans: c)Character
4.Which symbol is used for single-line comments in JavaScript?
a)// b)/* */
c)<!-- --> d)**
ans a)//
5.What is the default return type of a function in C if no
return type is
specified?
a)void b)int
c)char d)float
Ans: b)int
6. Which network device is used to connect multiple networks together?
a)Hub b)Switch
c)Router d)Repeater
ans: c)Router
7. What is cloud computing?
a)A type of software b)A
type of hardware
c)The delivery of computing services over the internet d)A programming language
Ans: c)The delivery of computing services over the
internet
8. Which of the following is NOT a principle of OOP?
a)Encapsulation b)Inheritance
c) Compilation d)Polymorphism
Ans: c) Compilation
9.Which of the following SDLC models is also known as the
"linear-
sequential model"?
a)Spiral Model b)Waterfall
Model
c)Agile Model d)V-Model
Ans: b)Waterfall Model
Short Answer
Questions: 15×5-25]
GROUP B
10. What is database? Explain any three advantages of DBMS. [2+3=5]
Ans:-
Database:-
It is a collection of interrelated data . These can be stored in the form of tables. A database can be of any size and varying complexity. A database may be generated and manipulated manually or it may be computerized.
Example:
Customer database consists the fields as cname, cno, and ccity.
DBMS:
The software tool package that helps gatekeeper and manage data storage, access and maintenances. It can be either in personal usage scope (MS Access, SQLite) or enterprise level scope (Oracle, MySQL, MS SQL, etc).
DBMS advantages:-
1. Multiple users:
DBMS allows us to share the data among many users and from different sites. It is done to enter multiple data and for the customers. For a complex database, we assign limited access control for them.
2. Backup:
Backup means storing the data in different location or machines. It is done by users or the computers themselves to recover the data in the case of failure. Like reserving a ticket online, suppose 100 persons have reserved and the suddenly the system became down, Now what to do in this scenario, we need old data and new data both. Hence the administrator recovers the data from backup.
3.Data security:-
Obviously, the data for an organization is crucial. What would happen if a hacker or unauthorized person uses it? Our data could be public and misused by third persons for their own purpose. To avoid that risk we assign specific roles to users. We may filter incoming and outgoing data. For this the DBMS is helpful.
OR
Explain second normal form with example. [5]
Second normal form:-
11. Write a javascript function that takes two numbers as
arguments and returns their sum.[5]
OR
Write a PHP script to find the largest of three numbers.
12. Explain the concept of inheritance in OOP. How does
inheritance help in code reusability?[2+3]
13 What is e-learning? Write any three advantages of
e-learning. [2+3]
14. What is the purpose of the requirements gathering phase
in the SDLC? Explain. [2+3]
Long Answer
Questions: [2x8-16]
GROUP C
15.What is computer network? Explain any three types of
network topologies with their advantages.
[2+6]
16. Write a C program to read and display employee details using a structure. [Define a structure Employee to store employee name (string), ID (integer), and salary (float)]. Write a program to input values for these fields and then display them.
OR
What is pointer? Write a C program to add two numbers using call by reference. [2+6]
THE END
