SOLVED NATIONAL PABSAN KATHMANDU
Pre-Qualifying Exam-2081
Class-X
FM-50
Sub-Opt, Computer Science
Time-2hrs
PM-17.5
"Group-A" [10
Marks]
1. Answer the following
questions in one sentence. [6×1=6]
a. Define computer
network.
Ans: Computer
network is a group of two or more computers and devices connected to each other
through wired or wireless media to exchange data and information and share
hardware, software and other resources.
b. What is search
engine?
Ans: A
search engine is an online tool that helps users find information on the
internet using keywords or phrases, and provide relevant results.
c. What is tuple in
database?
Ans:
A tuple is a row in a table which contains information about single items in a
database.
d. Give name of any two
RDBMS software.
Ans: MS-Access and
Oracle
e. Define local
variable.
Ans: A variable which is defined in a module and is not
accessible to any other module is called local variable.
f. Write down any two
features of C programming language.
Ans: Any two features of
C programming language are:
·
Portability:
C code can be compiled and executed on different systems with minimal
modifications.
·
C
is a case-sensitive programming language. It understands the capital alphabets
and small alphabets as different values.
2. Write the appropriate
technical terms for the following. [2×1=2]
a. Networking devices
use to regenerate the signal and transfer further. Repeater
b. Online postal
service, E-mail
3. Write the full forms. [2×1=2]
i. SIM – Subscriber Identity
Module
ii. NOS – Network Operating
System
"Group-B" [24 Marks]
4. Answer the following
questions. [9×2=18]
a. What are the two advantages
of ring topology over bus topology?
Ans: The two advantages
of ring topology over bus topology are:
Ring topology manages
data traffic more efficiently with technologies like token passing.
Ring topology supports
equal data transmission opportunities for all devices.
b. Define hardware
security. Write the importance of power protection device to protect the
computer.
The importance of power
protection device to protect the computer is to prevent damage to
the computer's hardware and data loss due to sudden power fluctuations.
c. What do you mean by
Digital Citizenship? List its' two advantages.
Ans: Digital
citizenship refers to the responsible and ethical use of technology and the
internet which involves understanding, practicing, and promoting appropriate
behavior when using digital tools and resources.
Any
two advantages are:
It teaches users to protect personal information and avoid
online risks like cyberbullying and scams.
Encourages creating a responsible and ethical online
presence.
d. Define e-commerce.
Give example of any two commercial sites in Nepal.
Ans: E-commerce
refers to the buying and selling of goods and services over the internet.
Any two commercial sites
in Nepal are: mucha and daraz.
e. List any two threats
of using social media.
f. Define Form and
Report.
Ans: Form
is one of the MS-Access database objects which provides graphical interface to
view, modify and add data in a table or multiple linked tables.
Report
is one of the MS-Access database objects used to present information in an
effective and organized format that is ready for printing.
g. Write down the
advantages of database management system over traditional data storage system.
The advantages of
database management system over traditional data storage system are:
a)
It
reduces data redundancy which means duplication of data.
b)
It
allows multiple users to access the same data simultaneously.
c)
Large
volume of data can be stored and updated easily.
d)
It
provides high security of data as well as maintains accurate database.
h. What is the
difference of 'Allow Zero length' and 'required' field properties of MS-Access.
Ans: The "Allow
Zero Length" property controls if empty strings are allowed, while the
"Required" property ensures the field cannot be left null.
i. Define Query. List
out its type.
Ans: Query
is an object of database that is used to view, retrieve, change and analyze
records from a table or multiple linked tables based on specified condition.
Its
types are:
Select
query and Action Query (update, delete, append
and make table query
5. Write the output of
the following program. [2]
DECLARE SUB series ()
CALL series
END
SUB series ()
i = 3
FOR c = 1T0 5
PRINT i *c^2;
NEXT c
END SUB
Dry Run
|
i |
C=1
to 5 |
PRINT
i *c^2; |
|
3 |
1 to
5 yes |
3x1^2 3x1 =3 |
|
|
2 to
5 yes |
3x2^2 3x4 =12 |
|
|
3 to
5 yes |
3x3^2 =3x9 27 |
|
|
4 to
5 yes |
3x4^2 =3x16 =48 |
|
|
5 to
5 yes |
3x5^2 3x25 =75 |
|
|
6 to
5 no Loop
exists |
|
The output of the
program is:
3 12
27 48 75
6. Re-write the given
program after correcting the bugs. REM to find the factorial of a given number.
[2]
DECLARE FUNCTION FACTO
(N$)
CLS
INPUT "Enter a
number"; N
CALL FACTO (N)
END
FUNCTION FACTO ( )
F = 1
WHILE N = 0
F =F* N
N = N - 1
WEND
FACTO=F
END SUB
Debugged Program:
DECLARE FUNCTION FACTO (N)
CLS
INPUT "Enter a
number"; N
PRINT FACTO (N)
END
FUNCTION FACTO (N)
F = 1
WHILE N < >
0
F =F* N
N = N - 1
WEND
FACTO=F
END FUNCTION
7. Study the given
program and answer the given questions.[2]
DECLARE SUB SUM (N)
CLS
INPUT "Enter any
number"; N
CALL SUM (N)
END
SUB SUM (N)
WHILE N > 0
R=N MOD 10
T = T + R
N =Ni10
WEND
PRINT "The Sum of individual
digit is"; T
END SUB
Questions:
a) How many parameter(s)
is used in the above program? List them.
Ans: 1 parameter is used
in the above program.
b) Write the use of MOD
in above program.
Ans: The MOD
operator is used to calculate the remainder of a division operation between two
numbers.
"Group-C" [16 Marks]
8. Convert/Calculate the
following as per instructions [4×1=4]
i. (9876)10 into Binary
Divide by the base 2 to
get the digits from the remainders:
|
Division |
Quotient |
Remainder (Digit) |
|
(9876)/2 |
4938 |
0 |
|
(4938)/2 |
2469 |
0 |
|
(2469)/2 |
1234 |
1 |
|
(1234)/2 |
617 |
0 |
|
(617)/2 |
308 |
1 |
|
(308)/2 |
154 |
0 |
|
(154)/2 |
77 |
0 |
|
(77)/2 |
38 |
1 |
|
(38)/2 |
19 |
0 |
|
(19)/2 |
9 |
1 |
|
(9)/2 |
4 |
1 |
|
(4)/2 |
2 |
0 |
|
(2)/2 |
1 |
0 |
|
(1)/2 |
0 |
1 |
= (10011010010100)2
(9876)10 =
(10011010010100)2
ii. (2081)16 into octal
Converting hex to binary
6C16 =
6 = 0110
C = 1100 = 11011002
11011002
Converting binary to
octal
001 = 1
101 = 5
100 = 4
(2081)16 = (154)8
iii. 11010+10110
|
|
1 |
1 |
0 |
1 |
0 |
|
+ |
1 |
0 |
1 |
1 |
0 |
|
1 |
1 |
0 |
0 |
0 |
0 |
11010+10110 = 110000
iv. 101110 ¸ 101
|
101) |
1 |
0 |
1 |
1 |
1 |
0 |
(1001 |
|
|
-1 |
0 |
1 |
|
|
|
|
|
|
0 |
0 |
0 |
1 |
1 |
0 |
|
|
|
|
|
|
1 |
0 |
1 |
|
|
|
|
|
|
0 |
0 |
1 |
|
Q = 1001
R = 1
9. (a) Write a program
to calculate area of a circle using SUB..... END SUB and perimeter of rectangle
using FUNCTION... END FUNCTION. [4]
DECLARE SUB AREA (R)
DECLARE FUNCTION PER(L, B)
CLS
INPUT “Enter radius of circle”; R
INPUT “Enter length of rectangle”; L
INPUT “Enter breadth of rectangle”; B
CALL AREA(R)
PRINT “Perimeter of rectangle=”; PER(L,B)
END
SUB AREA(R)
A= 22/7 * R ^ 2
PRINT “Area of rectangle=”; A
END SUB
FUNCTION PERI(L, B)
PERI = 2 * (L + B)
END FUNCTION
b. A sequential file
"detail.dat" contain Name, Age and mobile number of few persons.
Write a QBASIC program to display the name of those persons who are eligible to
cast the vote. [ Age must be 18 or above to cast the vote.] [4]
OPEN “detail.dat” FOR
INPUT AS #1
CLS
PRINT “Name of persons
who are eligible to cast vote are”
WHILE NOT EOF(1)
INPUT #1, N$, A, P
IF A>=18 THEN PRINT
N$
WEND
CLOSE #1
END
10. Write a C program to
test whether the given number is exactly divisible by 13 or not.
#include <stdio.h>
int main()
{
int num;
printf("Enter a number: ");
scanf("%d", &num);
if (num % 13 == 0)
{
printf("The number %d is divisible
by 13.\n", num);
}
else
{
printf("The number %d is not
divisible by 13.\n", num);
}
return 0;
}
***
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