Class XII Computer Science Practice Questions

Paper : Computer Science

1. What is recursive function? Specify the conditions when you can not create recursive function? 2

2. Name the Header file(s) that shall be needed for successful compilation of the following C++ code?

void main() { char st[20]; cin.getline(st,15); if(islower(st[0]) cout<<�Starts with alphabet�; else cout<<strlen(st);

} 2 3. Rewrite the following program after removing syntactical error(s) if any. Underline each correction.

#include<iostream.h> #define SIZE =10 VOID Main() { int a[SIZE]={1,2,3,4,5}; float x=2; SIZE=5; for(int i=0; i<SIZE ; i++) cout<<a[i]%x; } 2

4 In the following program, find the correct possible output(s) from the options:

#include<stdlib.h> #include<iostream.h> void main() { randomize(); char Area[][10]={�NORTH�,�SOUTH�,�EAST�,�WEST�}; int ToGo; for(int I=0;I<3;I++) { ToGo=random(3)+1; cout<<Area[ToGo]<<�:�; } }

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a) SOUTH:EAST:SOUTH: b) NORTH:SOUTH:NORTH: c) SOUTH:EAST:WEST: d) WEST:EAST:EAST: 2

5. class data { int num ; public: data ( int n ) { num = n ; } void show ( ) { cout << n <<endl; }}; class database : public data { char name[12]; data d ; public : ________________________ }; Fill in the blanks to define a constructor for the derived class assigning values of

the data passed from main ( ) and to assign a data 15 of base class constructor data n.2 6. Define a class named Publisher in C++ with the following descriptions : Private members Id long title 40 char author 40 char price , stockqty double stockvalue double valcal() A function to find price*stockqty with double as return type Public members a constructor function to initialize price , stockqty and stockvalue as 0 Enter() function to input the idnumber , title and author Takestock() function to increment stockqty by N(where N is passed as argument to this function) and call the function valcal() to update the stockvalue(). sale() function to decrease the stockqty by N (where N is sale quantity passed to this function as argument) and also call the function valcal() to update the stockvalue outdata() function to display all the data members on the screen. 4 7 Give the output of the following program segment.

#include<iostream.h> void change (int *,int);



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void main() { int a[ ] = { 2,4,6,8,10 }; change(a,5); for(int i =0; i<5; i++) cout<<a[i]<<� �; } void change(int *b, int n) { int i ; for( i =0; i<n; i++) *(b+i) = *(b+i)+5; } 2

8. Give the output of the following program segment. #include<iostream.h> void POINTER(int *N, int j) { for(int i=1; i<j; i++) *(N+i-1)=*(N+i)+1; } void main( ) { int a[ ]={ 12 , 19 , 20}, b[ ]={24, 13, 11}, c[ ]={ 5, 8,9}; POINTER (a,3); POINTER (b,3); POINTER(c,3); for(int i=0;i<3;i++) cout<<a[i]<<"@"; cout<<endl; for(i=0;i<3;i++) cout<<b[i]<<"*"; cout<<endl; for(i=0;i<3;i++) cout<<c[i]<<'#�; cout<<endl; } 3

9 Explain about virtual base class using a suitable example? 2 10. Answer the questions (i) and (ii) after going through the following program: class Date { int day,month,year; public: Date(Date &D); //function-1 Date(int a,int b,int c) //function-2 { day=a; month=b; year = c; } };

(i) Write the name of the function-1 (ii) Create an object, such that it invokes function-2 2

11. Consider the following declarations and answer the questions given below: 4 class Mydata { protected:



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int data; public: void Get_mydata(int); void Manip_mydata(int); void Show_mydata(int); Mydata( ); ~Mydata( ); }; class Personal_data { protected: int data1; public: void Get_personaldata(int); void Show_personaldata(int); Personal_data1( ); ~Personal_data1( ); }; class Person: public Mydata, Personal_data { public: void Show_person(void); Person( ); ~Person( ); }; i) How many bytes will be required by an object belonging to class Person? ii) Which type of inheritance is depicted in the above example? iii) List the data members that can be accessed by the member function Show_person( ). iv) What is the order of constructor execution at the time of creating an object of class Person?

12. Simplify the Boolean expression of F using Karnaugh Maps:

F (a, b, c) = (1, 3, 5, 7) 3

13. There are four railway tracks at a place. It is desired to design a logic circuit, which can give a signal when three or more trains pass together at any given time.

(i) Draw the truth table for the above problem. (ii) Simplify the expression using K-Map.

(iii) Draw a Logic circuit. 3 14. Given the following truth table, write the sum-of-product form of the function F(x, y, z). 1

X Y Z F 0 0 0 0 0 0 1 1 0 1 0 1



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0 1 1 0 1 0 0 1 1 0 1 0 1 1 0 0 1 1 1 1

15.Compare packet switching and message switching. 1 16. Expand the following terminologies: i) WAIS ii) NFS 1 17. What is web Portal ? Name any one. 1 18.What do you understand by network security? 1 19 What do mean by shareware software and free software. 1 20.A company in Qatar has 4 wings of buildings as shown in the diagram: (4)

Center to center distances between various Buildings: W3 to W1 45m W1 to W2 55m W2 to W4 20m W4 to W3 160m W3 to W2 120m W1 to w4 80m Number of computers in each of the wing: W1 250 W2 15 W3 15 W4 35 Computers in each wing are networked but wings are not networked. The

company has now decided to connect the wings also. i) Suggest a most suitable cable layout of the connection between the wings

and topology. ii) Suggest the most suitable wing to house the server of this company with a

suitable reason. iii) Suggest the placement of the following devices with justification: 1) Internet connecting device/modem 2) Repeater

W1

W2

W3

W4



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iv) The company is planning to link its head office situated in India with the offices at Oman. Suggest an economic way to connect it; the company is ready to compromise on the speed of connectivity. Justify your answer. 21. Expand the following terms with respect to Networking. 2

i). SMTP ii)SMS iii) NIC iv) PPP

22. Differentiate between HTML and XML? 2 23.What do you mean by constraint? What is the similarity and dissimilarity between primary key and unique constraint? 2 24. Study the following tables TOUR and ACCOMODATION and write SQL commands

for the questions (i) to (iv) and give outputs for SQL queries (v) to (viii). 6 Table : TOUR

SNO STUNO

NAME STD JAIPUR BARMER POCKET

1 B01 Aamir XII LB MB 2000

2 B02 Salman XII MB UB 2500

3 B03 Akshay XI LB LB 2000

4 B04 Ranveer XI UB UB 1500

5 G01 Shilpa XII LB LB 2500

6 G02 Preeti XII MB UB 1500

7 G03 Rani XI UB MB 3500

Table : ACCOMODATION

STUNO ROOMNO FLOOR

FOOD

B01 201 II Veg

B02 201 II N Veg

B03 202 II N Veg

B04 202 II Veg

G01 402 IV Veg

G02 402 IV N Veg

G03 403 IV Veg

Note : In Stuno B stands for Boys and G stands for Girls JAIPUR refers Train to JAIPUR and BARMER refers Train to BARMER LB � Lower Berth, MB � Middle Berth, UB � Upper Berth

i. Display the details of student who got lower berth in both Jaipur and Barmer train.

ii. Display the name of students whose food choice is Veg. iii. Update the food type as N Veg for girls students.



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iv. Display the sum of pocket money of the students standard wise. v. select tour.stuno, name, roomno from tour, accomodation where

accomodation.stuno = tour.stuno; vi. select count(pocket), sum (pocket) from tour, accomodation where tour.stuno

= accomodation.stuno AND food ='Veg'; vii. select distinct roomno from accommodation; viii. select max(pocket), min(pocket) from tour group by std;



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Class XII Computer Science Practice Questions

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