(PAPER) Computer Science Class XII (CBSE) Sample Mock Paper
Disclaimer: This website is NOT associated with CBSE, for official website of CBSE visit - www.cbse.gov.in
Computer Science Class XII (CBSE) Sample Mock Paper
Max Marks : 75
Time allowed : 3 hrs
Q 1. (a) Illustrate the concept of
function overloading with the help of an example?
Q 1 (b) Name the header file, to which following built-in function
belong:
(i)isupper( )
(ii)setw( )
(iii)exp( )
(iv)strcmp( )
Q 1 (c) Will the following program execute successfully? If not, state
the reason(s).
#include<stdio.h>
void main()
{
int s1,s2,num;
s1=s2=0;
for(x=0;x<11;x++)
{
cin<<num; if(num>0) s1+=num; else s2=/num;
}
cout<<s1<<s2;
}
Q 1 (d) Give the output of the following program segment (Assuming all required header files are included in the program):
char *NAME="a ProFiLe";for(int x=0;x<strlen(NAME);x++)
if(islower(NAME[x]))
NAME[x]=toupper(NAME[x]);
else
if(isupper(NAME[x]))
if(x%2!=0)
NAME[x]=tolower(NAME[x-1]);
else
NAME[x]--;
cout<<NAME<<endl;
Q 1 (e) Write the output of the following program:
#include<iostream.h>
int func (int &x, int y=10)
{
if(x%y==0) return ++x; else return y--;
} void main()
{
int p=20,q=23;
q=func(p,q);
cout<<p<<q<<endl;
p=func(q);
cout<<p<<q<<endl;
q=func(p);
cout<<p<<q<<endl;
}
Q 1 (f) Write a function seqsum( ) in C++
with two arguments, double x and int n. The function should return a value of
type double and it should find the sum of the following series:
Q 2(a) Why is a destructor function
required in classes? Illustrate with the help of an example.
Q 2(b) Define a class worker with the following specifications:
Private members of class worker
|
wno |
integer |
|
wname |
25characters |
|
hrwrk,wgrate |
|
|
totwage |
|
|
calcwg( ) |
|
|
Public members of the class worker
|
|
|
in_data( ) |
A function to accept values for wno, wname,hrwrk,wgrateand invoke calcwg( ) to calculate totpay. |
|
out_data( ) |
A function to display all the data members on the screen.You should give definitions of functions. |
Q 2(c)Consider the following and answer the following questions given below:
{
int A;
protected:
int B,C;
public:
void INPUT(int);
void OUTPUT( );
} ;
class Dept:protected School
{
int X,Y;
protected:
void IN(int, int);
public:
void OUT( );
};
class Teacher:public Dept
{
int P;
void DISPLAY(void);
public:
void ENTER( );
};
(i) Name the base class and derived
class of the class Dept.
(ii) Name the data member(s) that can be accessed from function OUT( ).
(iii) Name the private member function(s) of class Teacher.
(iv) Is the member function OUT( ) accessible by the objects of Dept?
Q 3. (a)Suppose A, B, C are arrays of
integers of size M, N and M+N respectively. The members in array A appear in
ascending order while the members in array B appear in descending order. Write a
user defined function in C++ to produce third array C by merging arrays A and B
in ascending order. Use A, B and C as arguments in the function.
Q 3 (b) An array VAL[1……15][1……10] is stored in the memory with
each element requiring 4 bytes of storage. If the base address of array VAL is
1500, determine the location of VAL[12][9] when the array VAL is stored (i) Row
wise (ii) Column wise.
Q 3 (c) Write a user-defined function in C++ to find and display the sum
of both the diagonal elements of a two dimensional array MATRIX[6][6] containing
integers.
Q 3 (d) Evaluate the following postfix expression using a stack. Show the
contents of stack after execution of each operation:
20, 8, 4, /, 2, 3, +, *, -
(e) Give necessary declaration for a queue containing float type numbers; also
write a user defined function in C++ to insert a float type number in the queue.
You should use linked representation of queue.
Q 4 (a)Name two member functions of
ofstream class.
Q 4 (b) Assuming the class DRINKS defined below, write functions in C++ to perform the following:
(i)Write the objects of DRINKS to a binary file.
(ii) Read the objects of DRINKS from binary file and display them on screen when
DNAME has value "INDY COLA".
{
int DCODE;
char DNAME[13]; //Name of the drink
int DSIZE; //Size in liters float DPRICE;public:
void getdrinks( ) {cin>>DCODE>>DNAME>>DSIZE>>DPRICE;}
void showdrinks( )
{cout<<DCODE<<DNAME<<DSIZE<<DPRICE<<endl;}
char *getname( ){return DNAME;} };
Q 5. (a) What is the need for
normalistion? Define third normal form.
Write SQL commands for (b) to (e) and write the outputs for (g) on the basis of table CLUB.
Table: CLUB
|
COACH_ID |
COACHNAME |
AGE |
SPORTS |
DATOFAPP |
PAY |
SEX |
|
1 |
KUKERJA |
35 |
KARATE |
27/03/1996 |
1000 |
M |
|
2 |
RAVINA |
34 |
KARATE |
20/01/1998 |
1200 |
F |
|
3 |
KARAN |
34 |
SQUASH |
19/02/1998 |
2000 |
M |
|
4 |
TARUN |
33 |
BASKETBALL |
01/01/1998 |
1500 |
M |
|
5 |
ZUBIN |
36 |
SWIMMING |
12/01/1998 |
750 |
M |
|
6 |
KETAKI |
36 |
SWIMMING |
24/02/1998 |
800 |
F |
|
7 |
ANKITA |
39 |
SQUASH |
20/02/1998 |
2200 |
F |
|
8 |
ZAREEN |
37 |
KARATE |
22/02/1998 |
1100 |
F |
|
9 |
KUSH |
41 |
SWIMMING |
13/01/1998 |
900 |
M |
|
10 |
SHAILYA |
37 |
BASKETBALL |
19/02/1998 |
1700 |
M |
Q 5 (b) To show all the information about
the swimming coaches in the club.
Q 5 (c)To list names of all the coaches
with their date of appointment (DATOFAPP) in descending order.
Q 5 (d) To isplay a report showing
coachname, pay, age, and bonus (15% of pay) for all the coaches.
Q 5 (e) To insert a new row in the CLUB
table with the following data: 11, "PRAKASH",37,
"SQUASH",{25/02/1998},2500, "M"
Q 5 (f) Give the output of following SQL statements:
(i)Select COUNT (distinct SPORTS) from CLUB;
(ii) Select MIN(AGE) from CLUB where SEX="F";
(iii) Select AVG(PAY) from CLUB where SPORTS="KARATE";
(iv) Select SUM(PAY) from CLUB where DATOFAPP>(31/01/98);
Q 5 (g)Assume that there is one more table COACHES in the database as shown below:
| SPORTS PERSON | SEX | COACH_NO |
| AJAY | M | 1 |
| SEEMA | F | 2 |
| VINOD | M | 1 |
| TANEJA | F | 3 |
What will be the output of the following query:
SELECT SPORTS PERSON, COACHNAME
FROM CLUB, COACHES
WHERE COACH_ID=COACH_NO;
Q 6. (a)State Absorption Laws. Verify one
of the Absorption Laws using a truth table.
Q 6 (b) Prove X’.Y+Y’.Z=X’.Y.Z+X’.Y’.Z’+X.Y’.Z+X’.Y’.Z
algebraically.
Q 6 (c) Obtain simplified form for a
boolean expression
F(x,y,z,w)= å(1,3,4,5,7,9,11,12,13,15) using Karnaugh Map.
Q 6 (d) Draw the logic circuit for a half
adder.
Q 6 (e) Represent the Boolean expression
X’Y+Y’Z with the help of NAND gates only.
Q 6 (f) Write the Sum of Products form of the function G(U,V,W). Truth table representation of G is as follows:
| U | V | W | G |
| 0 | 0 | 0 | 0 |
| 0 | 0 | 1 | 0 |
| 0 | 1 | 0 | 1 |
| 0 | 1 | 1 | 1 |
| 1 | 0 | 0 | 1 |
| 1 | 0 | 1 | 0 |
| 1 | 1 | 0 | 0 |
| 1 | 1 | 1 | 1 |
Q 7 (a) What are Routers?
Q 7(b) What is the purpose of using a
Modem?
Q 7 (c) Write two advantages and two
disadvantages of Bus Topology in network.
Q 7 (d) What is the difference between LAN
and WAN?