Karnataka SSLC Answer Key April 2019 Elements of Computer Science

CCE RF
CCE RR
REVISED & UNREVISED
B
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KARNATAKA SECONDARY EDUCATION EXAMINATION BOARD, MALLESWARAM,
BANGALORE – 560 003
G—È.G—È.G≈È.“. Æ⁄¬fiOÊ⁄–, »⁄·¤^È%/HØ√≈È — 2019
S. S. L. C. EXAMINATION, MARCH/APRIL, 2019

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MODEL ANSWERS
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Date : 23. 03. 2019 ] CODE NO. : 74

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Subject : ELEMENTS OF COMPUTER SCIENCE

( À¤≈¤ @∫⁄¥¿£% & Æ⁄‚¥´⁄¡¤»⁄~%}⁄ À¤≈¤ @∫⁄¥¿£%/ Regular Fresh & Regular Repeater )
[ V⁄¬Œ⁄r @MO⁄V⁄◊⁄fl : 90
[ Max. Marks : 90

Value Points Marks
1. Fill in the blanks with the correct symbol/word(s) by
selecting from the choices given in the brackets :
10 × 1 = 10

i) The part of the computer which performs arithmetic and
logic operation is ................................ .
Ans. ALU

ii) The longest key on the key board is .............................. .
Ans. space bar

iii) Pay roll is an example of ................................. software.
Ans. application

iv) Processing box in a flow chart is indicated by .............. .
Ans. rectangle

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74 2 CCE RF & RR
Value Points Marks
v) An identifier whose value does not change throughout
the program is called a ............................... .
Ans. constant

vi) The integer conversion character is ...............................
.
Ans. d
vii) The logic AND operator is ............................. .
Ans. &&

viii) One control structure with in the other control structure
is termed as ......................... .
Ans. nesting
ix) The statements allow the user to store values in the
computer memory is ........................ .
Ans. input statement

x) The values of variables used in a call statement is termed
as .............................. .
Ans. parameters
2. a) Define software. 2
An instruction given to the computer tell the hardware
how to process data. A program refers to a set of
instruction. A collection of programs forms the software.
Software is the intangible invisible part of the computer. 2
b) Explain the applications of C language. 3
i) Operating system
ii) Text editing
iii) Database management system
iv) Spread sheets
v) Accounting packages 3×1=3
c) Explain the characteristics of algorithm. 5
i) Algorithm is an aid for the programmer to write
precise programs
ii) Algorithm gives general sequence of steps and is
not related to any one programming language
iii) The steps specified in the algorithm must be
performable by the computer
iv) Algorithm must take care of all possibilities
including exceptional events. 5×1=5

RF & RR(B)-8006

CCE RF & RR 3 74
Qn. Sub.
Value Points Marks
Nos. Qn.No.
3. a) Define arithmetic logic unit. 2
The algorithm logic unit (ALU) operates on the data
available in the main memory and sends data back to
main memory after processing it. 2
b) Write short notes on system software. 3
System software are a collection of programs needed to
operate and control the functioning of a computer. These
are the software which provide the environment for
writing and running the application program. These
software include
i) The operating system which act an interface
between user and computer hardware
ii) The service programs like compiler and interpreters
used developing application programs. 3
c) Explain the characteristics of flow chart. 5
i) They are easy to understand as they are
diagrammatic representations
ii) They are concise and precise
iii) Flow chart language free. After developing a flow
chart, coding can be done in any of the
programming languages
iv) Flow chart makes the programming easy
v) Flow chart provides a convenient way of
documentation. 5×1=5
4. a) Mention any four basic steps in developing the solution
to any problem. 2
i) Define the problem
ii) Plan the solution
iii) Test the solution
iv) Implement the solution
v) Document the solution 4×=2
b) How are computer languages are classified ? 3
Computer language

Low level language High level language

Machine language Assembly language
3

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74 4 CCE RF & RR
Value Points Marks
c) Draw any five symbols used in flow charts. 5
Symbols used in flow charts
Symbol Meaning

Terminal symbol (Start or end of a flow
chart)

Process symbol (Computational steps)

I/O symbol (Input or output operation)

Decision Symbol (Testing a condition
and branches to different paths in the
flow chart

A Connector (for joining different parts of
a flow chart

Loop symbol (Used for FOR loops)

Flow lines (Arrows to show transfer of
control)
5×1=5
5. a) What are compilers ? 2
Compiler is a software which takes the high level
language as a whole and converts it into equivalent
machine language program which can be executed.
Compiler differs from interpreter in that it takes the
program as a whole, compiles it into equivalent machine
codes and stores external storage. 2
b) Write a C program to find the area of a triangle given the
three sides. 8
/ * Program to find the area of a triangle
given three sides */
#include<math.h>
main ( )
{
float i,j,k,s, area;
clrscr ( );
printf ("\n Enter the three sides of the
triangle :");
scanf ("%f%f", &i, &j, &k);
if (i<j+k && j<i+k && k<i+j)

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CCE RF & RR 5 74
Qn. Sub.
Value Points Marks
Nos. Qn.No.
{
s=(i+j+k)/2;
area = sqrt (s*(s–i)*(s–j)*(s–k);
printf ("\n Area of triangle is %f" area);
else
printf ("\n The three sides do not make a
triangle ...");
}
getch ();
8
6. a) List out the different types of statements in C. 2
Statements are the different types, they are
i) Null statements v) Output statements
ii) Declaration statements vi) Expression statements
iii) Assignment statements vii) Block statements
iv) Input statements viii) Labeled statement. 4×=2
b) Write a C program to find the smallest of 3 Nos. using
conditional operator. 8
/* Write a C program to find smallest of 3
Nos. using conditional operator */
#include<stdio.h>
#include<stdio.h>
main( )
{
int a,b,c, x;
clrscr ( );
printf ("enter the value of a,b,c");
scanf ("%d%d%d%d", &a, &b, &c);
x=a<b ? a:b;
x=x<c ? x:c;
printf ("%d is smallest no.",x);
getch( );
}
8
7. a) What is the conversion specifier for decimal integer and
string ? 2
Specifier Explanation
%d Decimal integer
%s String 2×1=2

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74 6 CCE RF & RR
Value Points Marks
b) Write a C program to find reverse order of given
numbers. 8
/* Write a C program to find reverse order of
given nos.*/
#include<stdio.h>
#include<conio.h>
main( )
{
int a,r,s=0;
printf ("enter the a nos\n")
scanf ("%d", &a);
while (a1=0)
{
r=a%10;
s=s*10+r;
a=a/10;
}
printf ("the reverse of given no.: %d"s);
}
8

8. a) Identify the errors in the following statements : 2
i) x + y = sum
ii) 5=x+y+z
i) x + y = sum = It has to be sum = x + y ;
ii) 5 = x + y + z = On the left hand side a constant is
not allowed. 2×1=2
b) Write a C program to compute the largest of three
numbers. 8
/* Program to compute largest of 3 numbers */
main ( )
{
int a,b,c, larger
printf ("please enter 3 integer numbers\n");
scanf ("%d%d%d", &a, &b, &c);
large=a;/*assume first number as largest*/
if(b>larger)/*compare with second number*/
large=b;/*replace large with b if b is largest*/
if (c>large)/*compare with third number*/
large=c;/*replace large with c if c is largest*/
printf =("largest of 3 numbers is= "%d=%d\n"larger);
} 8

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CCE RF & RR 7 74
Qn. Sub.
Value Points Marks
Nos. Qn.No.
9. a) What are logical operators ? 2
These are used to combine two or more conditions. They
yield a value of either true or false depending on whether
the combined condition is true or false. 2
b) Write a C program to convert decimal to binary. 8
#include<stdio.h>
#include<conio.h>
#include<math.h>
main( )
{
int n,r,s–0,i;
clrscr( );
printf ("enter the value of n");
scanf ("%d", &n);
i=1
while (n>=1)
{
r=n–(n/2)*2;
s=s+r*i;
n=n/2
n≠i*10;
printf ("the decimal number is =%d\n",s);
getch( );
} 8

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