Sample Papers Class Xii Computer Science

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Class XII (COMPUTER SCIENCE) Sample Question Paper –1

Time Duration 3 Hrs

Max. Marks

70

Note 1. All question ae Compulsory 2. Programming Language C++ 1 Answer the following A Name the header file of c++ which following function belongs i) clrscr() ii gets() iii toupper() iv isdigit() B What is the difference between local and global variables ? Give the Examples of boths C Rewrite the following program after removing all syntax errors if any #include(iostream.h) Void main(); { int X[]=60,50,30,40},Y=0;count=4; cin>>Y; for(i=count-1;i>=0,i--) switch(i) { case 0 : case 2: cout<> Y+X[i]; } } D Write the output of the following program void main() { int x=5;int y=5; cout<<x--; cout<<”,”; cout<< --x; cout<<”,”; cout<
2

2 2

2

2 2

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float y; abc() { y=5;} ~( ) {} void main() { ABC a1,a2; } 2 Answer the following A Explain Protected, Private and public members of a class in context of inhertence 2 B Answer the following question i and ii after going through the following class 2 class Exam { int marks; char subject[20]; public : Exam() //Function 1 { marks=0;strcpy(subject,”Computer”);} Exam(char s[]) //Function 2 { marks=0;strcpy(subject,s);} Exam(int m) //Function 3 { marks=m;strcpy(subject,”Computer”);} Exam(int m, char s[]) //Function 4 { marks=m;strcpy(subject,s);} } i Write a statement in C++ that would execute functions 3 and function 4 of class Exam ii Which features ogf object oriented programming is demonstrated using function 1 function 2 function 3 and function 4 in the above class. C Define a class travel in c++ with the following descriptions 4 Private members Travel code of type long Place of type character array No_of_travellers of type integer No_of_buses of type integer Public members Aconstructor to assign initial values of travel code as 201, place as “Nanital” ,no_of_travellers as 10 no_of buses as 1A function newtravel() which allow user to enter travel code place and no_of travelers also assign a value of no_of_buses as per the following condition No of traveler

no of buses

Less than 20 1 Equal to 20 or less than 40 2 Equal to 40 o more than 40 3 A function show_travel() to display the content from all the data members on screen.

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D. Explain polymorphism with suitable example?

4

3 Answer the following A Write a Function in C++ to print the sum of all four corners of a two

dimensional array. [Assuming the 2D Array to be a square matrix with odd dimension i.e. 3×3, 5×5, 7×7 etc...] Example, if the array content is 3 5 4 7 6 9 2 1 8 Output through the function should be : The sum of corner is 3+4+2+8= 17

3

B An Array MAT[30][10] is to stored in memory column wise with each elements occupying 8 bytes of memory. Find out the base address and the address of element MAT[20][5], if the location of MAT[5][7] is stored at address 1000. 4 C Write a Function in UPPER HALF() which takes a two dimensional array A with size N rows and N columns as argument and point the upper half of the array. 2 ThaArray is 3 4 2 5 5 2 1 2 3 4 2 1 2 3 3 4 2 1 2 1 1 2 4 7 1 The output is 3 4 2 5 1 2 3 2 3 2

5 4 3 1 1 D Write a function to perform a PUSH Operation on a dynamically allocated stack containg real number? 3 E Evaute the expression 562+*124/- in tabular form showing stack after every step 2 4 Answer the following A Assuming that a text file named First.TXT contains some text written into it, write a function named vowelwords(), that reads the first.txt and create a new file named second.txt to contain only those words from the file First.txt which start with a lowercase vowel(i.e. ‘a’,’e’,’I’,’o’,’u’) For example 3 Carry umbrella and overcoat when it rains Then the file second.txt contains Umbrella and overcoat it B Write a function to open a files in read and write mode 1 C Write a c++ function copies all the lowercase letters in text file called “mytext.txt” into file called “lower.txt” 2

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5 Answer the following A What do you understand by Degree and Cardinality of a table? B Given the following table for a database library Table BOOKS Book_id C0001 F0001

Book_name Fast cook The Tears

T0001

My First C++ C++ Brainworks Thunderbolts Anna Roberts

T0002 F0002

Author_name Lata kapoor William Hopkins Brain &Brooke A.W.Rossaine

2

Publishers EPB First Pub

Price 365 650

Type Cookery Fiction

Qty 5 20

EPB

350

Text

10

TDH

350

Text

15

First Pub

750

Fiction

50

Table ISSUED Book_ID T0001 C0001 F0001

Quantity_Issued 4 5 2

Write Sql Queries from i to vi i. to show book name,author name and price of books of first pub publisher 1 ii to list the names from books of text type. 1 iii to display the names and price from books in asending order of their prices 1 iv to increase the price of all books of EPB publisher by 50 v to display book_id,book_name and quantity_issued for all books which have been issued(the query will require contents from both tables) vi to insert new row in the table issued having the following data “F0003, 1 1 vii Give the output of the following a) Select count(*) from books; b) Selectmax(price) from books where quantity >=15; c) Select count(distinct publishers) from books; Q 6 Answer the following A Prove the Demorgan Theorem ? B Reduce the following Boolean Expression from K Map

2

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F(A,B,C,D)=?×(0,1,2,4,5,6,8,10) 3 C Draw a logic Circuit for Half Adder 2 D write the POS form of the boolean Function F, which is represented by the following truth table 1 X Y Z F 0 0 0 1 0 0 1 1 0 1 0 0 0 1 1 1 1 0 0 0 1 0 1 1 1 1 0 0 1 1 1 0

Q 7 Answer the following A Expand term i TCP/IP ii CDMA iii URL iv LAN 2 B Explain Star and Bus Topologies 2 C ABC Ltd has set up its new center at Delhi for its office and web based activities it has 4 bulidings shown in diagram Center to center distance between Various building Buld 1 to buld 2 Buld 2 to buld 3 Buld 3 to buld 4 Buld 1 to buld 4 Buld 2 to buld 4 Buld 1 to buld 3

50 m 150 m 25 m 170m 125 m 90 m

Number of computers inBulding Buld1 Buld 2 Buld 3 Buld 4

25 50 125 10

Buld1

Buld2

Buld 4

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a) Suggest a cabel layout of connection between buldings. 1 b) Suggest the most suitable place (i.e bulding) to house the server of the organization with the suitable reason 1 c) Suggest the placement of the follwing device with justification i) Reapeater ii Hub/switch 1 d) the organization is planning to link its front office suitated in the city in a hilly region where cable connection is not fesible, suggest an economic way to connect it with reasonably high speed? 1

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KENDRIYA VIDYALAYA SANGATHAN CHANDIGARH REGION Class XII (COMPUTER SCIENCE) Sample Question Paper –2

Time Duration 3 Hrs

Max. Marks

70

Note

1 All question ae Compulsory 2 Programming Language C++ A Difference between logical and syntax error with example B Name the Header file that shall be needed for the following code void main() { char string[]=”Kendriya vidyalaya No 2 Ambala cantt” Cout< void main() { int x; cin<<x; for(int y=0;y<10;y++); cout>>x+y; } D Give the output of the following program.

2 1

2

2

#include #include #include<string.h> void strfunc(Char *str) { Int I,j,len: len=strlen(str); for (i=0;i
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Strufunc(“Delhi”); } E Write a program to accept an integer number print the reverse of the number on Screen (Note if number enter by user Iis 3456 the result is 6543) F Given that

3

2

for( k=10;k<15;k++) { if (k<=12) cout<<”twice k=”<<2*k<<endl<<endl; else cout<<”k=”<
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Contact Dr. T.K. Jain (91-9414430763) regarding starting AFTERSCHO?ï OL centres in your college / institution / organisation. Promote social entrepreneurship, join PGPSE and become a social entrepreneur. Emial us : [email protected] 2 Answer the following A What is this pointer? Give one example B Answer the questions (i) and (ii) after going through the following class class Interview {

2

int Month; public: interview(int y )(month=y;} //constructor 1 interview(interview &t); //constructor 2 }; (i) Create an object, such that it invokes constructor 1 (ii) Write complete definition for constructor 2 (c) Define a class Tour in C++ with the description given below : 3 Private Members : TCode of type string No. ofAdults of type integer No. ofKids of type integer Kilometres of type integer TotalFare of type float Public Members : • A constructor to assign initial values as follows : TCode with the word “NULL” No. of Adults as 0 No. of Kids as 0 Kilometres as 0 TotalFare as 0 • A function assignFare ( ) which calculates and assigns the value of the data member TotalFare as follows For each Adult Fare(Rs) For Kilometres 500 300 200

>=1000 <1000&>=500 <500

For each Kid the above Fare will be 50% of the Fare mentioned in the above table

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Contact Dr. T.K. Jain (91-9414430763) regarding starting AFTERSCHO?ï OL centres in your college / institution / organisation. Promote social entrepreneurship, join PGPSE and become a social entrepreneur. Emial us : [email protected] For example : If Kilometres is 850, NoofAdults = 2 and No.of Kids = 3 Then TotalFare should be calculated as NumofAdults * 300 + NoofKids * 150 i.e. 2*300 + 3*150=1050 • A function EnterTour( ) to input the values of the data members TCode, No. ofAdults, No.of Kids and Kilometres; and invoke the Assign Fare( ) function. • A function ShowTour( ) which displays the content of all the data members for a Tour. (d) Answer the questions (i) to (iv) based on the following code : 4 class Trainer { char TNo [5], TName [20], Specialisation [10]; int Days; protected : float Remuneration; void AssignRem (float); public: Trainer ( ); void TEntry ( ); void TDisplay( ); }; class Learner { char Regno [10], LName [20], Program [10]; Protected : int Attendance, Grade; public: Learner ( ); void LEntry ( ); void LDisplay ( ); }; class Institute : public Learner, public Trainer { char ICode[10], IName [20]; public: Institute ( ); void IEntry ( ); void IDisplay ( ); };

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Contact Dr. T.K. Jain (91-9414430763) regarding starting AFTERSCHO?ï OL centres in your college / institution / organisation. Promote social entrepreneurship, join PGPSE and become a social entrepreneur. Emial us : [email protected] (i) Which type of Inheritance is depicted by the above example? (ii) Identify the member function(s) that cannot be called directly from the objects of class Institute from the following TEntry( ) LDisplay() IEntry() (iii) Write name of all the member(s) accessible from member functions of class Institute. (iv) If class Institute was derived privately from class Learner and privately from class Trainer, then, name the member function(s) that could be accessed through Objects of class Institute.

3 Answer the following A Write a Function in C++ to print the sum of all the values which are divisible by either 3 or are divisible by 5 present in a two dimensional array as the arguments to the function 3 B An array Arr[15][20] is stored in the memory along the row with each element occupying 4 bytes. Find out the Base Address and address of the element Arr[3][2], if the element Arr[5][2] is stored at the address 1500. 4 C Write a function in C++ to perform a delete operation in a dynamically allocated queue considering the following description : 4 struct Node { float U,V; Node *Link; }; class QUEUE { Node *Rear,*Front; Public: Queue() {Rear=NULL;Front=NULL;} void INSERT(); void DELETE(); ~QUEUE(); };

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(d) Write a function in C++ which accepts a 2D array of integers and its size as arguments and displays the elements of both the diagonal is 0 in an Array [Assuming the 2D Array to be a square matrix with odd dimension 3 i.e. 3×3, 5×5, 7×7 etc...] Example, if the array content is 3 5 4 7 6 9 2 1 8 Output through the function should be : 0 5 0 7 0 9 0 1 0 (e) Let p be the postfix notation of expression : 2 7, 2, -, 1, 14, -, 1, 2, *, +, -, ) Q 4 Answer the Following A Write modes of file ? 1 B Write a C++ program which reads one line at a time from the disk file Test.txt, and display it to a monitor. Your program has to read al the contents of the file . assume the length of the line not to exceed 80 charcters. You have to include all the header file if required. 2 C Assuming a binary file FUN.DAT is containing objects belonging to class Laughter. Write a user definded function in C++ to add more objects belonging to class Laughter at the bottom of it 3 Class Laugther { int idno; char type[5]; char desc[255]; public : void Newentry() { cin>>idno; gets(type); gets(desc); } Void showonscreen() { cout<
. A. Explain primary key and Candidate key? 2 Write SQL commands for b to e and write the output for f on the basis of the given AFTERSCHO?n OL CENTRE FOR SOCIAL ENTREPRENEURSHIP – Let us Change the World – www.afterschoool.tk Join PGPSE along with CS after class 12

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table.

Supp# S1 S2 S3 S4 S5

SuppName Britannia Mother Dairy Nirula’s Haldiram Bikaner

Table: Supplier Status City C Delhi C Mumbai L L L

Delhi Bangalore Jaipur

Qtysupp 10 20

Item# 12 13

20 40 30

16 14 14

B Find the total quantity by all the suppliers 1 C Display a report listing supplier number,status and item number for all those suppliers who have supplied quantity greater than or equal to 20 1 D Count the number of suppliers who,ve supplied quantity greater than or equal to 20 E Display a list of all suppliers supplying 14 and sorted by quantity supplied. F Give the output of the following SQl queries. i Select SUM(qtysupp) from supplier where item#=’14’; ii Select MAX(qtysupp) from supplier; iii Select supp# from supplier where status=’C’; iv Select Count(Distinct City) from Supplier. Q 6 Answer the following A. Explain Absorption law in Boolean algebra. B Write the equivalent Boolean Expression for the following Logic

Circuit. C Reduce the following Boolean Expression from K Map F(A,B,C,D)=π(0,2,7,8,10,15) D Draw a Logic Circuit of Full adder

1 1 2

2

2 3 1

Q 7 Answer the Following A Write Two advantages of Star and Bus topologies? 2 B Explain bridge and repeater ? 2 C (d) “Bhartiya Connectivity Association” is planning to spread their offices in four major cities in India to provide regional IT infrastructure support in the field of Education & Culture. The company has planned to setup their head office in New Delhi in three locations and have named their New Delhi offices as “Front Office”, “Back Office” and “Work Office”. The company has three more regional offices as “South Office”, “East Office” and “West Office”

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located in other three major cities of India. A rough layout of the same is as follows :

4 Approximate distances between these offices as per network survey team is as follows: Place From Place To Distance BackOffice Front Office 10KM Back Office Work Office 70 Meter Back Office East Office 1291 KM BackOffice West Office 790 KM Back Office South Office 1952 KM In continuation of the above, the company experts have planned to install the following number of computers in each of their offices : Back Office Front Office Work Office East Office West Office South Office

100 20 50 50 50 50

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(i) Suggest network type (out of LAN, MAN, WAN) for connecting each 1 of the following set of their offices : • Back Office and Work Office • Back Office and South Office (ii) Which device you will suggest to be procured by the company for 1 connecting all the computers with in each of their offices out of the following devices? • Switch/Hub • Modem • Telephone (iii) Which of the following communication medium, you will suggest to be procured by the company for connecting their local offices in New Delhi for very effective and fast communication? 1 • Telephone Cable • Optical Fiber • Ethernet Cable (iv) Suggest a cable/wiring layout for connecting the company’s 1 local offices located in New Delhi. Also, suggest an effective method/ technologyfor connecting the company’s regional offices-”East Office”, “West Office” and “South Office” with offices located in New Delhi.

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