SLC 2072 COMPUTER SCIENCE SOLVED PAPER
Group – A
(Computer fundamentals)
1. Answer the following questions.
1. a) Define LAN topology. Draw star topology.
Ans: The arrangement or connection pattern of nodes or computers and other devices of the network is called LAN topology.
1. b) Give any two symptoms of virus attacks.
Ans: The symptoms of virus attacks are:
i) Program takes more time to load, fail to load
or hang frequently.
ii) Unexpected messages or images appear
suddenly on the screen.
1. c) Write one advantage and one disadvantage of multimedia.
Ans: The advantage of multimedia is:
i) One can present ideas, information to
others in effective ways.
The disadvantage of multimedia is:
i) The cost of developing a multimedia product
is high.
1. d) Write any two ways of protecting computer
software.
Ans: The two ways of protecting computer software are:
i)Antivirus Software
ii)Backup System
1. e) Write any two services of internet.
Ans: The two services of internet are:
i) WWW (World Wide Web)
ii)E-mail
2. a)Convert as indicated:
i)(208)₁₀ into Binary
Converting decimal to binary,
2 208 0
2 104 0
2 52 0
2 26 0
2 13 1
2 6 0
2 3 1
1
(208)₁₀=(11010000)₂
ii)(104)₈ into decimal
Converting octal to decimal,
=1*8²+0*8¹+4*8⁰
=1*64+0*8+4*1
=64+0+4
=68
(104)₈=(68)₁₀
1. b) Perform the binary calculations:
i)1011+1101
1011
+1101
_________
11000
1011+1101=11000
ii)110*11
110
*11
________
110
+ 110
________
10010
✓110*11=10010
3. Match the following:
Answers:
1. a) Microwave : Unguided media
2. b) UTP : Guided media
3. c) UPS : Power protection device
4. d) SMTP : Protocol
4. State whether the following statements are true or false:
5. a) Walky-talky is an example of full duplex mode.
Ans: False
1. b) Data transfer rate is higher in optical fiber
cable than in co-axial cable.
Ans: True
1. c) The computer security refers to hardware
security only.
Ans: False
1. d) Sound Card is one of the components of
multimedia.
Ans: True
5. Write the appropriate technical terms of the
following:
a) A program that can disinfect a file from virus.
Ans: Antivirus software
b) A person who steals or destroys other’s data, information, files and program.
Ans: Hacker
c) A company which provides the internet facilities.
Ans: ISP (Internet Service Provider)
d) A computer which provides services to other computers in a network.
Ans: Server Computer
6. Write the full forms of:
i)URL : Uniform Resource Locator
ii)HTTP : HyperText Transfer Protocol
iii)LAN :Local Area Network
iv)MODEM :Modulator-Demodulator
Group – B
(Database)
7. Answer the following questions:
a) Write any four data types used in Ms-
ACCESS.
Ans: Four data types used in Ms-ACCESS are:
i) Text ii) Number iii) Currency
iv) Date/Time
b) Define database with example.
Ans: The systematic collection of organized and related information that can be used for different purposes is called database. For example: dictionary and telephone directory.
c) What is query?
Ans: A query is one of the objects of MS-Access that allows us to retrieve the desired information from a table or multiple linked tables.
8. State whether the following statements are true or false:
a) A query is used to select fields and records
from only one table.
Ans: False
b) MS-ACCESS is DBMS software.
Ans: True
c) Index decreases the speed of query and
sort operations.
Ans: False
d) Data in primary key has to be unique and
not null.
Ans: True
9. Match the following:
a) OLE : Data type
b) Validation Rule : Limits the value
c) Form : Data Entry
d) Indexing : Easy to search
Group – C
( Programming)
10. a) What is procedure?
Ans: The separate block of statements used by the module level code and called by any number of times is called procedure.
b) Write any two data types used in ‘c’ language.
Ans: The two data types used in the ‘c” language are:
1. i) int ii) float
c) Write down the functions of the following
statements:
i) OPEN: It opens a sequential file for one of the
three possible operations i.e. reading, writing or
appending.
ii) MKDIR: It makes or creates a new directory on
the specified disk.
11. Re-write the following program after correcting the bugs:
FUNCTION SUM(m,n)
Rem to print sum of two numbers
a=6
b=7
DISPLAY SUM(a,b)
END
FUNCTION SUM(m,n)
S=m+n
S=SUM
END SUM
Debugged program:
DECLARE FUNCTION SUM(m,n)
Rem to print sum of two numbers
a=6
b=7
PRINT SUM(a,b)
END
FUNCTION SUM(m,n)
S=m+n
SUM=S
END FUNCTION
12. Write the output of the following program:
DECLARE FUNCTION Interest(p,t,r)
CLS
LET p=100
LET t=2
LET r=5
LET d=Interest(p,t,r)
PRINT “The simple interest=”;d
END
[possible missing code………]
FUNCTION Interest (p,t,r)
Interest=(p*t*r)/100
End FUNCTION
OUTPUT
If the sub module is missing then error message will be
displayed.
Otherwise : The Output will be:
The simple interest = 10
13. Study the following program and answer the
following questions:
DECLARE FUNCTION Prod(N)
INPUT “Any number”;N
X=Prod(N)
PRINT X
END
FUNCTION Prod(N)
F=1
FOR K=1 TO N
F=F*K
NEXT K
Prod=F
END FUNCTION
a) Write the name of the user defined
function used in the above program.
Ans: The name of the user defined function used in the
above program is Prod.
b) Name the loop in the above program.
Ans: The loop in the above program is FOR…NEXT.
14. a) Write a program using SUB…..END SUB to
display reverse of input-string.
DECLARE SUB REV(A$)
CLS
INPUT “ENTER ANY STRING”;A$
CALL REV(A$)
END
SUB REV(A$)
FOR I= 1 TO LEN(A$)
B$=MID$(A$,I,1)
W$=B$+W$
NEXT I
PRINT “REVERSED STRING=”W$
END SUB
b) Write a program using FUNCTION…END
FUNCTION to find area of the triangle.
DECLARE FUNCTION AREA(B,H)
CLS
INPUT “ENTER BASE”;B
INPUT “ENTER HEIGHT”;H
PRINT “AREA OF TRIANGLE”;AREA(B,H)
END
FUNCTION AREA(B,H)
AREA=0.5*B*H
END FUNCTION
c) A sequential data file called “Marks.dat”
contains NAME, AGE, CITY, and TELEPHONE
fields. Write a program to display all the contents of the data file.
OPEN “Marks.dat” FOR INPUT AS #1
CLS
DO WHILE NOT EOF(1)
INPUT #1, N$, A, C$, T#
PRINT N$, A, C$, T#
LOOP
CLOSE #1
END