CBSE Set Q Computer Science Class XII 2000 Sample Test Papers For Class 12th for students online

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Computer Science Class XII (CBSE)
You are on questions 1 to 3

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(num0) 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:

class School
{
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[115][110] 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".

class DRINKS
{
int DCODE;
char DNAME[13];  //Name of the drink
int DSIZE;   //Size in liters float DPRICE;public:

void getdrinks( ) {cinDCODEDNAMEDSIZEDPRICE;}
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:

Table: COACHES
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)= (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 XY+YZ 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?