MBOSE Class 12 Question Paper 2019 for Computer Applications

Total No. of Printed Pages—12
HS/XII/A.Sc.Com/CAP/19

2019
COMPUTER APPLICATIONS
( Arts / Science / Commerce )
( Theory )

Full Marks : 70
Time : 3 hours
The figures in the margin indicate full marks for the questions

General Instructions :
(i) Write all the answers in the Answer Script.
(ii) Attempt Part—A (Objective Questions) serially.
(iii) Attempt all parts of a question together at one place.
(iv) Part—A (Objective Questions) is to be attempted
according to stream as mentioned.
(v) Attempt Part—B [Descriptive (Unit—I)] according to
stream as mentioned.

( PART : A—OBJECTIVE )
( Marks : 35 )
SECTION—I
( Marks : 25 )

1. Fill in the blanks from the list of words/phrases
given below : 1×10=10
( For Science stream candidates only )
(a) Boolean algebra does not have operations for
division and _____.

/62

( 2 )

(b) _____ algebra does not have a complement
function.

(c) Two switches connected in series behave as
_____ gate.

(d) If m i is the minterm for row i and M i is the
maxterm for row i, then _____ = M i .

( For Arts/Commerce stream candidates only )

(a) Technically, TELNET is a _____.

(b) _____ network reserved for the numerous
networks with a small number of nodes.

(c) In FrontPage, _____ view gives you a WYSIWYG
editing environment for creating and editing
Web pages.

(d) To add alternative text to an image, click on
_____ tab on picture properties.

( For all Science/Arts/Commerce stream candidates :
C Language )

(e) _____ are names that are given to various
program elements, such as variables, functions
and arrays.

(f) A _____ statement consists of several individual
statements enclosed within a pair of braces { }.

(g) The _____ tests the condition after having
executed the statements within the loop.

( 3 )

(h) _____ is a process by which a function calls itself
repeatedly, until some specified condition has
been satisfied.

(i) _____ function finds last occurrence of a given
character in a string.

(j) _____ increments what p points to.

List of words/phrases :

real repetition iteration class C
protocol OR mi while
identifiers class A strrchr ( ) AND
addition service provider *p++ Boolean
tasks compound subtraction m i’
general macros page expression
recursion multiplication picture do ... while
(*p)++ strchr

2. State whether the following statements are True or
False : 1×10=10
( For Science stream candidates only )

(a) According to De Morgan’s theorem,
(a + b )¢ = a ¢ + b ¢

(b) If logic expressions are given in product of sums
forms, the logic network can be realized using
OR-AND gates or only NOR gates.

( 4 )

( For Arts/Commerce stream candidates only )

(a) A sprider strips away many other markup
features so that it simply sees pure HTML
source.

(b) To ‘crop’ an image means to ‘interlace’ GIF
images to create a special visual effect.

( For all Science/Arts/Commerce stream candidates :
C Language )

(c) Suppose i is an integer variable whose value is 7
and f is a floating-point variable whose value is
8·5. The expression (i + f )% and results in the
integer remainder 3.

(d) The switch statement is a form of a one-way
decision.

(e) The function prototype declaration contains—
function’s name, return type and argument
type(s).

(f) ‘Strncat’ function appends one string at the end
of another.

(g) a[i][j] = b[k++]; means that
a[i][j] = b[k];
k++;

( 5 )

(h) When we subtract two pointers, as long as they
point into the same array, the result is the
number of bytes separating them.

(i) Only one member of a union can be assigned a
value at any one time.

(j) The statement
typedef int LENGTH
declares LENGTH as a variable of type int.

3. Choose and write the correct answer : 1×5=5
( For Science stream candidates only )

(a) According to associative law of Boolean algebra,
(i) a + (b × c ) = (a + b ) × (a + c )
(ii) a + (b + c ) = (a + b ) + c
(iii) a + b = b + a
(iv) a × (b × c ) = (a × b ) × c

(b) A/an _____ is an implicant which can be wholly
enclosed by a larger implicant on a Karnaugh
map.
(i) prime implicant
(ii) nonprime implicant
(iii) essential prime implicant
(iv) nonessential prime implicant

( 6 )

( For Arts/Commerce stream candidates only )

(a) _____ protocol breaks e-mail messages into
packets.

(i) FTP
(ii) IP
(iii) TCP
(iv) HTTP

(b) _____ identifies problems with pages and links in
the Web.

(i) Page view
(ii) Reports view
(iii) Navigation view
(iv) Hyperlinks view

( For all Science/Arts/Commerce stream candidates :
C Language )

(c) The statements which are used to create special
program features, such as logical tests, loops
and branches, are known as

(i) expression statements
(ii) compound statements
(iii) control statements
(iv) None of the above

( 7 )

(d) switch (choice=getchar())
{
case ‘R’ : printf (‘‘red\n’’);
_____;
default : printf (‘‘color\n’’);
}
(i) break
(ii) continue
(iii) Either (i) or (ii)
(iv) None of the above

(e) The sorting method in which two elements are
interchanged immediately upon discovering that
they are out of order is known as
(i) selection sort
(ii) bubble sort
(iii) insertion sort
(iv) None of the above

SECTION—II
( Marks : 10 )

4. Answer any five of the following in not more than
3 to 4 sentences each : 2×5=10

( For Science stream candidates only )

(a) Write a note on the principle of duality.
(b) Explain what is meant by ‘‘don’t care’’ condition.

( 8 )

( For Arts/Commerce stream candidates only )

(a) Write a note on TELNET.

(b) Write the required steps to add images to a table.

( For all Science/Arts/Commerce stream candidates :
C Language )

(c) What is the purpose of the printf function?
Compare it with the putchar function.

(d) What is the purpose of the if-else statement?

(e) In C, arrays are zero-based. Explain.

(f) What is a structure and a structure member?

(g) What are the three sorts of ways, the C
preprocessor performs textual substitutions on
your source code?

( PART : B—DESCRIPTIVE )
( Marks : 35 )

UNIT—I
( For Science stream candidates only )

5. (a) Convert the following into minterm : 1+1=2
(i) A+B
(ii) XY + Z

( 9 )

(b) Write the implementation of logic expressions
with logic gates of the following expression : 3
Y = AB ¢C + ABC ¢ + ABC
[Use the necessary block diagram.]

OR

6. (a) Find the dual of the following logic expression : 1
X × Y (Y + Z + X ) + X × Y ¢
(b) Simplify the following expression : 2
(X + Y )(X ¢ + Z )(Y + Z )

(c) Convert the following expressions into canonical
forms : 1+1=2
(i) XZ + X ¢YW + XZW ¢
(ii) X (Y ¢ + Z ¢ )

7. (a) Represent the following Boolean function on
Karnaugh map and simplify it : 3
F (A, B , C , D ) = S m (1, 3, 7, 11, 15) + Sd (0, 2, 5)

(b) Explain map rolling. 2

OR

8. (a) Obtain the following simplified POS form of the
Boolean function : 3
F (A, B , C , D ) = P (0, 1, 3, 4, 5, 6, 7, 9, 10, 11, 13, 15)

(b) Explain essential prime implicant and
nonessential prime implicant. 1+1=2

( 10 )

( For Arts/Commerce stream candidates only )
5. (a) Write a note on file transfer protocol. 2

(b) Briefly explain different types of Internet
connectivity available. 3

OR

6. Explain Class A, Class B and Class C networks,
clearly bringing out the distinction among them. 5

7. (a) Write the steps to add your own image to a Web
page. 3

(b) Describe various steps to move an image. 2

OR

8. (a) List different views available in FrontPage. 3

(b) Write the steps to check for slow pages in
FrontPage. 2

( Unit—II, Unit—III and Unit—IV :
For all Science/Arts/Commerce stream candidates )

UNIT—II
9. Name and describe the four basic data types in C.
1×4=4
OR
10. (a) Mention the differences between getch() and
getche() functions. 1+1=2

(b) Write a note on the GOTO statement. 2

( 11 )

11. (a) What is an escape sequence? What is its
purpose? 1+1=2

(b) What is the purpose of the do-while statement?
How does it differ from the while statement? 1+1=2
OR
12. (a) Write a note on scanf function. 2

(b) Write a user-friendly C program demonstrating
an if statement showing the value entered is
negative. 2

UNIT—III
13. (a) What is a function? What is a function call? 2
(b) What is the purpose of return statement? 1
(c) Write a program in C to illustrate the call of a
function. 2
OR
14. (a) What is recursion? 1
(b) Write a program in C to calculate the factorial of
an integer quantity using recursion. 3

(c) What are header files in C? 1

15. (a) Explain with an example, how elements of an
array can be accessed by using a pointer. 2
(b) Write a program in C to sort an array of integers
into ascending order, using selection sort
method. 3

( 12 )

OR

16. (a) What is a null pointer? 1

(b) What is meant by dynamic memory allocation?
How is the size of the memory block specified? 1+1=2

(c) How can a two-dimensional array be represented
with a pointer notation? Give example. 2

UNIT—IV

17. (a) What is the purpose of the ‘typedef’ feature in C? 1½

(b) Write a note on enumerations. 2

OR

18. Explain what is meant by formatted I/O. What record
I/O deals with? 3+½=3½

19. Explain the union data type, contrasting it with a
structure using a suitable example. 3½

OR

20. Write a program to copy the contents of one file into
another, character-by-character. 3½

HHH

HS/XII/A.Sc.Com/CAP/19/62 K9—3450