FIRST TERMINAL EXAMINATION-2081
Subject: Opt. II Computer Science Full
Marks: 50
Class: 10 Time:
2 hrs.
Candidates are required to answer the
questions in their own way words as far as practicable. Figures in the margin indicate
the full marks.
Attempt
all questions.
Group ‘A'
1. Answer the following questions in one sentence: (6´1=6)
a) What is
downloading?
Download is
the process of transferring files or data from a remote server or another
device to user’s computer or device.
b) What is
intranet?
An intranet
is a private network for an organization's members to share information,
resources, and communicate internally.
c) What is
Wi-Fi?
Wi-Fi is a
wireless technology that provides high-speed internet and network access using
radio waves.
d) Write
any two commandments of cyber ethics.
v Do
not use a computer to publish fake information.
v Do
not destroy or delete the records of other people.
e) What is
an actual parameter?
Actual parameter is argument which is used to
pass real value or data to the procedure.
f) What
are the digits of hexadecimal number system?
The digits of the hexadecimal number system
are:
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F.
Here, 0-9 represent values 0 to 9, and A-F
represent values 10 to 15.
2. Write appropriate technical term for the following: (2´1=2)
a) Cabling structure of LAN.
Topology
b)
Transferring illegal items through
the internet that is banned in some locations.
Cyber Laundering
3. Write the full form of the following: (2´1=2)
a) G2G - Government-to-Government
b) HTTP - Hypertext
Transfer Protocol
Group ‘B'
4. Answer the following questions: (9´2=18)
a) Write about bus topology with suitable
diagram.
Bus topology
is a network configuration where all devices are connected to a single central
cable known as a "bus". If the main cable breaks, the whole network
stops working. It is used in small networks where not many devices are
connected.
b)
Classify computer network on the basis of
geographical location and explain it.
On the basis of geographical location,
computer is classified into:
LAN (Local Area Network)
MAN (Metropolitan Area Network)
WAN (Wide Area Network)
A LAN (Local Area Network) is a
network that connects computers and devices within a small area, like a home,
office, or school.
A MAN (Metropolitan Area Network)
is a network that covers a large area within a city allowing for data sharing
and communication.
WAN (Wide Area Network) is a
network that covers a large geographic area, such as different cities,
countries, or even globally, connecting multiple LANs and MANs.
c)
Differentiate between bounded and
unbounded media with examples.
|
Guided Media |
Unguided Media |
|
The
media which uses cable or wire to transfer data and information among
computers are called guided communication media. |
Unguided
communication is a communication channel in which data and information are
transferred through the air. |
|
Examples of guided media are Twisted Pair
Cable, Co-Axial Cable and Fiber Optic Cable |
Examples of unguided media are Radio Wave, Micro
Wave and Satellite Communication |
d) Write any four services of internet.
Any four services of internet are:
v
E-Mail
v
Chat
v
FTP
v
E-Commerce
e) Write any two opportunities and threats in
social media.
Opportunities of
Social Media
Connectivity:
Enables people to connect and communicate globally.
Marketing and
Branding: Provides a platform for businesses to promote products and reach a
broader audience.
Threats of Social
Media
Cyberbullying:
Risk of harassment or bullying online.
Privacy Issues:
Potential misuse of personal data and information.
f) What do you mean by ICT?
ICT refers to the use of computers, the internet,
and other digital tools to manage, communicate, and share information.
g) What is the main aim of formulating cyber
law of Nepal?
v
To legalize the transaction through
electronic media to control various types of electronic frauds
v
To punish a person who does criminal
activities through electronic means especially on computers.
h)
What do you understand by modular
programming? State any two advantages of it.
Modular
programming is a technique which divides program into many small logical,
manageable and functional modules or blocks.
Any
two advantages are:
Coding the
program and testing is very easy.
Different
programmers can write different modules separately.
i) What is local and global variable in QBASIC?
A variable which is defined in a module and is not accessible to any
other module is called local variable.
Variables
which are declared outside the procedure and whose values can be accessed from
any procedure or module are called global variables.
5. Write down the output of the given program.
\Show with dry run in
table. (2)
DECLARE SUB
PATTERN(S$)
CLS
B$=”PROGRAM”
CALL
PATTERN(B$)
END
SUB
PATTERN(S$)
H=LEN(S$)
I=10
FOR J=1 TO H
STEP 2
PRINT TAB(I);
MID$(S$,J,H)
H=H-2
I=I+1
NEXT J
END SUB
Dry Run Table
|
B$ = S$ |
H= LEN (S$) |
I |
J=1 to 7 step 2 |
PRINT TAB(I); MID$(S$,J,H) |
H=H-2 |
I=I+1 |
|
PROGRAM |
7 |
10 |
1 to 7 step 2 Yes |
MID$(S$,1,7) PROGRAM |
7-2=5 |
10+1=11 |
|
|
5 |
11 |
3 to 7 step 2 Yes |
MID$(S$,3,5) OGRAM |
5-2=3 |
11+1=12 |
|
|
3 |
12 |
5 to 7 step 2 Yes |
MID$(S$,5,3) RAM |
3-2=1 |
12+1=13 |
|
|
1 |
13 |
7 to 7 step 2 Yes |
MID$(S$,7,1) M |
1-(2)=-1 |
13+1=14 |
|
|
-1 |
14 |
9 to 7 step 2 No [Loop Exits] |
|
|
|
The output of the program
is:
PROGRAM
OGRAM
RAM
M
6. Re-write the given program
after correcting the bugs: (2)
CREATE
FUNCTION CUBE(A)
REM to print cube of a number
CLS
Get "Enter a number"; A
Call CUBE(A)
END
FUNCTION
CUBE(A)
ANS=A^3
ANS=CUBE
END FUNCTION
Debugged Program
DECLARE FUNCTION CUBE(A)
REM to print cube of a number
CLS
INPUT "Enter a
number"; A
PRINT CUBE(A)
END
FUNCTION
CUBE(A)
ANS=A^3
CUBE=ANS
END FUNCTION
7. Study the following program and answer the given questions:
(2´1=2)
DECLARE SUB
FACTORS(N)
N=10
CALL
FACTORS(N)
END
SUB
FACTORS(N)
FOR J=1 TO N
R=N MOD J
IF R=0 THEN
PRINT J;
NEXT J
END SUB
Questions:
a) Write
down the use of MOD in the program.
The MOD
operator is used to calculate the remainder.
b) How
many time the loop executes in the above program?
The loop executes 10 times in the above program.
Group
‘C'
Long question Answers: (4´4=16)
8. Convert / calculate as per the instruction:
i) (111011 +
1101 ) - ( 11011 )
|
|
1 |
1 |
1 |
0 |
1 |
1 |
|
|
|
+ |
1 |
1 |
0 |
1 |
|
1 |
0 |
0 |
1 |
0 |
0 |
0 |
|
|
- |
1 |
1 |
0 |
1 |
1 |
|
|
1 |
0 |
1 |
1 |
0 |
1 |
(111011 +
1101 ) - ( 11011 ) = (101101)
ii) ( 11011 X
11 )
|
|
|
1 |
1 |
0 |
1 |
1 |
|
|
|
|
|
× |
1 |
1 |
|
|
|
1 |
1 |
0 |
1 |
1 |
|
|
1 |
1 |
0 |
1 |
1 |
× |
|
1 |
0 |
1 |
0 |
0 |
0 |
1 |
|
110) |
1 |
0 |
1 |
0 |
0 |
0 |
1 |
(1101 |
|
|
|
1 |
1 |
0 |
|
|
|
|
|
|
|
1 |
0 |
0 |
0 |
|
|
|
|
|
|
|
1 |
1 |
0 |
|
|
|
|
|
|
|
|
1 |
0 |
0 |
1 |
|
|
|
|
|
|
|
1 |
1 |
0 |
|
|
|
|
|
|
|
0 |
1 |
1 |
|
Q=1101
R=011
iii) ( 235 )10 into octal
Divide by the
base 8 to get the digits from the remainders:
|
Division |
Quotient |
Remainder (Digit) |
|
(235)/8 |
29 |
3 |
|
(29)/8 |
3 |
5 |
|
(3)/8 |
0 |
3 |
= (353)8
( 235 )10 = (353)8
iv) ( 9A5 )16
into binary
Convert each hex digit to 4 binary digits
9A5
9 = 1001
A = 1010
5 =
0101
= 1001 1010 0101
(
9A5 )16 = (1001 1010 0101)2
9. a)
Write a program in QBASIC that asks two
numbers to find remainder using SUB….END SUB program and product of two numbers
using FUNCTION…END FUNCTION.
DECLARE SUB
DIV(A,B)
DECLARE FUNCTION
PRO(A,B)
CLS
INPUT “Enter First Number”; A
INPUT
“Enter Second Number”; B
CALL DIV(A,B)
PRINT “The
product of two numbers=”; PRO(A, B)
END
SUB DIV(A,B)
R = A MOD
B
PRINT “Remainder
of two numbers=”; R
END SUB
FUNCTION PRO(A,B)
PRO = A *
B
END FUNCTION
b) WAP
to find sum of digits of a number using SUB….END SUB. [Hint: 456: 4+5+6=15]
DECLARE SUB SUM
(N)
CLS
INPUT
"ENTER ANY NUMBER"; N
CALL SUM (N)
END
SUB SUM (N)
S = 0
WHILE N <
> 0
R = N MOD 10
S = S + R
N = N \ 10
WEND
PRINT "SUM
OF DIGITS="; S
END SUB
10. Write a program to find greatest number
out of three numbers using FUNCTION…END FUNCTION.
DECLARE
FUNCTION GREAT (A, B, C)
INPUT
“ENTER ANY THREE NUMBERS”; A, B, C
PRINT
“THE GREATEST NUMBER IS”; GREAT (A, B, C)
END
FUNCTION
GREAT (A, B, C)
IF
A > B AND A > C THEN
G
= A
ELSEIF
B > A AND B > C THEN
G
= B
ELSE
G
= C
END
IF
GREAT
= G
END
FUNCTION
or
Write a program to count the occurrence of
letter 'e' in the supplied string using SUB…END SUB.
DECLARE
SUB COUNT (S$)
CLS
INPUT
"ENTER ANY STRING"; S$
CALL
COUNT(S$)
END
SUB COUNT
(S$)
EC = 0
FOR I = 1
TO LEN(S$)
B$ =
MID$(S$, I, 1)
C$ =
UCASE$(B$)
IF C$ =
"E" THEN EC = EC + 1
NEXT I
PRINT
"TOTAL NO. OF LETTER E = "; EC
END SUB
?ÿ@
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