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CBSE Class XII Sample / Mock 2015 : COMPUTER SCIENCE

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CLASS-XII COMPUTER SCIENCE (Subject Code 083) SAMPLE PAPER 2014 - 15 Time allowed : 3 hours Maximum Marks: 70 Instructions: (i) All questions are compulsory. (ii) Programming Language: Section A C+ +. (iii) Programming Language : Section B Python. (iv) Answer either Section A or B, and Section C is compulsory. Section A (C++) Q1. a. Differentiate between ordinary function and member functions in C++. Explain with an example. [2] b. Write the related library function name based upon the given information in C++. (i) Get single character using keyboard. This function is available in stdio.h file. (ii) To check whether given character is alpha numeric character or not. This function is available in ctype.h file. [1] c. Rewrite the following C++ program after removing all the syntactical errors (if any), underlining each correction. : [2] include<iostream.h> #define PI=3.14 void main( ) { float r;a; cout<< enter any radius ; cin>>r; a=PI*pow(r,2); cout<< Area= <<a } d. Write the output from the following C++ program code: #include<iostream.h> #include<ctype.h> [2] void strcon(char s[]) { for(int i=0,l=0;s[i]!='\0';i++,l++); for(int j=0; j<l; j++) { if (isupper(s[j])) s[j]=tolower(s[j])+2; else if ( islower(s[j])) s[j]=toupper(s[j])-2; else s[j]='@'; } } void main() { char *c="Romeo Joliet"; strcon(c); cout<<"Text= "<<c<<endl; c=c+3; cout<<"New Text= "<<c<<endl; c=c+5-2; cout<<"last Text= "<<c } e. Find the output of the following C++ program: #include<iostream.h> #include<conio.h> #include<ctype.h> class Class { int Cno,total; char section; public: Class(int no=1) { Cno=no; section='A'; total=30; } void addmission(int c=20) { section++; total+=c; } void ClassShow() { cout<<Cno<<":"<<section<<":"<<total<<endl; [3] } }; void main() { Class C1(5),C2; C1.addmission(25); C1.ClassShow(); C2.addmission(); C1.addmission(30); C2.ClassShow(); C1.ClassShow(); } f. Study the following C++ program and select the possible output(s) from it : Find the maximum and minimum value of L. [2] #include<stdlib.h> #include<iostream.h> #include<string.h> void main() { randomize(); char P[]="C++PROGRAM"; long L; for(int I=0;P[I]!='R';I++) { L=random (sizeof(L)) +5; cout<<P[L]<<"-"; } } } i) R-P-O-Rii) P-O-R-+iii) O-R-A-Giv) A-G-R-MQ2.a. How encapsulation and abstraction are implemented in C++ language? Explain with an example. [2] b. Answer the questions (i) and (ii) after going through the following C++ class: [2] class Stream { int StreamCode ; char Streamname[20];float fees; public: Stream( ) //Function 1 { StreamCode=1; strcpy (Streamname,"DELHI"); fees=1000; } void display(float C) //Function 2 { cout<<StreamCode<<":"<<Streamname<<":"<<fees<<endl; } ~Stream( ) //Function 3 { cout<<"End of Stream Object"<<endl; } Stream (int SC,char S[ ],float F) ; //Function 4 }; i) In Object Oriented Programming, what are Function 1 and Function 4 combined together referred as? Write the definition of function 4. ii) What is the difference between the following statements? Stream S(11, Science ,8700); Stream S=Stream(11, Science ,8700); c. Define a class Customer with the following specifications. [4] Private Members : Customer_no integer Customer_name char (20) Qty integer Price, TotalPrice, Discount, Netprice float Member Functions: Public members: * A constructer to assign initial values of Customer_no as 111,Customer_name as Leena , Quantity as 0 and Price, Discount and Netprice as 0. *Input( ) to read data members(Customer_no, Customer_name, Quantity and Price) call Caldiscount(). * Caldiscount ( ) To calculate Discount according to TotalPrice and NetPrice TotalPrice = Price*Qty TotalPrice >=50000 Discount 25% of TotalPrice TotalPrice >=25000 and TotalPrice <50000 - Discount 15% of TotalPrice TotalPrice <250000 - Discount 10% of TotalPrice Netprice= TotalPrice-Discount *Show( ) to display Customer details. d. Answer the questions (i) to (iv) based on the following code: class AC { [4] char Model[10]; char Date_of_purchase[10]; char Company[20]; public( ); AC( ); void entercardetail( ); void showcardetail( ); }; class Accessories : protected AC { protected: char Stabilizer[30]; char AC_cover[20]; public: float Price; Accessories( ); void enteraccessoriesdetails( ); void showaccessoriesdetails( ); }; class Dealer : public Accessories { int No_of_dealers; char dealers_name[20]; int No_of_products; public: Dealer( ); void enterdetails( ); void showdetails( ); }; (i) How many bytes will be required by an object of class Dealer and class Accessories? (ii) Which type of inheritance is illustrated in the above c++ code? Write the base class and derived class name of class Accessories. (ii) Write names of all the members which are accessible from the objects of class Dealer. (iv) Write names of all the members accessible from member functions of class Dealer. Q3a) An array T[-1..35][-2..15] is stored in the memory along the row with each element occupying 4 bytes. Find out the base address and address of element T[20][5], if an element T[2][2] is stored at the memory location 3000. Find the total number of elements stored in T and number of bytes allocated to T [3] b. Write a function SORTSCORE() in C++ to sort an array of structure IPL in descending order of score using selection sort . [3] Note : Assume the following definition of structure IPL. struct IPL { int Score; char Teamname[20]; }; c. Write member functions to perform POP and PUSH operations in a dynamically allocated stack containing the objects of the following structure: [4] struct Game { char Gamename[30]; int numofplayer; Game *next; }; d. Write a function in C++ to print the sum of all the non-negative elements present on both the diagonal of a two dimensional array passed as the argument to the function. [2] e. Evaluate the following postfix expression. Show the status of stack after execution of each operation separately: 2,13, + , 5, -,6,3,/,5,*,< [2] Q4. a. Write the command to place the file pointer at the 10th and 4th record starting position using seekp() or seekg() command. File object is file and record name is STUDENT . [1] b. Write a function in C++ to count and display the no of three letter words in the file VOWEL.TXT . [2] Example: If the file contains: A boy is playing there. I love to eat pizza. A plane is in the sky. Then the output should be: 4 c. Given the binary file CAR.Dat, containing records of the following class CAR type: [3] class CAR { int C_No; char C_Name[20]; float Milage; public: void enter( ) { cin>> C_No ; gets(C_Name) ; cin >> Milage; } void display( ) { cout<< C_No ; cout<<C_Name ; cout<< Milage; } int RETURN_Milage( ) { return Milage; } }; Write a function in C++, that would read contents from the file CAR.DAT and display the details of car with mileage between 100 to 150. Section B (Python) Q1.a) How is a static method different from an instance method? b) Name the function / method required for [2] [1] i) Finding second occurrence of m in madam. ii) get the position of an item in the list c) Rewrite the following python code after removing all syntax error(s). Underline the corrections done. [2] def main(): r = raw-input( enter any radius : ) a = pi * math.pow(r,2) print Area = + a d) Give the output of following with justification x=3 x+= x-x print x e) What will be printed, when following python code is executed class person: def __init__(self,id): self.id = id arjun = person(150) arjun.__dict__[ age ] = 50 print arjun.age + len(arjun.__dict__) Justify your answer. [2] [3] f) What are the possible outcome(s) expected from the following python code? Also specify maximum and minimum value, which we can have. [2] def main(): p = 'MY PROGRAM' i=0 while p[i] != 'R': l = random.randint(0,3) + 5 print p[l],'-', i += 1 i) R - P - O - R ii) P - O - R - Y iii) O -R - A - G iv) A- G - R - M Q2. a) How data encapsulation and data abstraction are implemented in python, explain with example. [2] b) What will following python code produce, justify your answer x=5 y=0 print A try : print B a=x/y print C except ZerorDivisionError: print F except : print D c) Write a class customer in python having following specifications [2] [4] Instance attributes: customernumber - numeric value customername - string value price, qty, discount, totalprice, netprice methods : - numeric value init() to assign initial values of customernumber as 111, customername as Leena , qty as 0 and price, discount & netprice as 0. caldiscount ( ) To calculate discount, totalprice and netprice totalprice = price * qty discount is 25% of totalprice, if totalprice >=50000 discount 15% of totalprice, if totalprice >=25000 and totalprice <50000 discount 10% of totalprice, if totalprice <250000 netprice= totalprice - discount input() to read data members customername, customernumbar, price, qty and call caldiscount() to calculate discount, totalprice and netprice. show( ) to display Customer details. d) What are the different ways of overriding function call in derived class of python ? Illustrate with example. [2] e) Write a python function to find sum of square-root of elements of a list. List is received as argument, and function returns the sum. Ensure that your function is able to handle various situations viz. list containing numbers & strings, module required is imported etc. [2] Q3. a) What will be the status of following list after third pass of bubble sort and third pass of selection sort used for arranging elements in ascending order? 40, 67, -23, 11, 27, 38, -1 [3] b) Write a python function to search for a value in the given list using binary search method. Function should receive the list and value to be searched as argument and return 1 if the value is found 0 otherwise. [2] c) Define stack class in python to operate on stack of numbers. [4] d) Write a python function using yield statement to generate prime numbers till the value provided as parameter to it. [3] e) Evaluate the following postfix expression. Show the status of stack after execution of each operation separately: 2,13, + , 5, -,6,3,/,5,*,< [2] Q4.a) How is method write() different from writelines() in python? [1] b) Given a pickled file - log.dat, containing list of strings. Write a python function that reads the file and looks for a line of the form Xerror: 0.2395 whenever such line is encountered, extract the floating point value and compute the total of these error values. When you reach end of file print total number of such error lines and average of error value. [3] c) Given a text file car.txt containing following information of cars carNo, carname, milage. Write a python function to display details of all those cars whose milage is from 100 to 150. [2] Section C Q5. a. Define degree and cardinality. Based upon given table write degree and cardinality. [2] PATIENTS PatNo PatName Dept DocID 1 Leena ENT 100 2 Surpreeth Ortho 200 3 Madhu ENT 100 4 Neha ENT 100 5 Deepak Ortho 200 b. Write SQL commands for the queries (i) to (iv) and output for (v) & (viii) based on a table COMPANY and CUSTOMER [6] COMPANY CID NAME CITY PRODUCTNAME 111 SONY DELHI TV 222 NOKIA MUMBAI MOBILE 333 ONIDA DELHI TV 444 SONY MUMBAI MOBILE 555 BLACKBERRY MADRAS MOBILE 666 LAPTOP DELL DELHI CUSTOMER CUSTID NAME PRICE QTY CID 101 Rohan Sharma 70000 20 222 102 Deepak Kumar 50000 10 666 103 Mohan Kumar 30000 5 111 104 Sahil Bansal 35000 3 333 105 Neha Soni 25000 7 444 106 Sonal Aggarwal 20000 5 333 107 Arjun Singh 50000 15 666 (i) To display those company name which are having prize less than 30000. (ii) To display the name of the companies in reverse alphabetical order. (iii) To increase the prize by 1000 for those customer whose name starts with S (iv) To add one more column totalprice with decimal(10,2) to the table customer (v) SELECT COUNT(*) ,CITY FROM COMPANY GROUP BY CITY; (vi) SELECT MIN(PRICE), MAX(PRICE) FROM CUSTOMER WHERE QTY>10 ; (vii) SELECT AVG(QTY) FROM CUSTOMER WHERE NAME LIKE %r%; (viii) SELECT PRODUCTNAME,CITY, PRICE FROM COMPANY,CUSTOMER WHERE COMPANY.CID=CUSTOMER.CID AND PRODUCTNAME= MOBILE ; Q6. a) State and define principle of Duality. Why is it so important in Boolean Algebra? [2] b) Write the equivalent boolean expression for the following logic circuit [2] c) Write Product Of Sum expression of the function F (a,b,c,d) from the given truth table [1] a b c d F 0 0 0 0 0 0 0 0 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 0 1 1 0 0 1 1 0 0 1 0 1 0 1 0 1 0 1 0 1 0 0 0 1 1 0 1 1 0 0 0 1 1 1 1 1 1 0 1 1 1 1 1 0 0 1 1 1 0 1 0 1 1 0 0 0 1 d) Obtain the minimal SOP form for the following boolean expression using KMap. F(w,x,y,z) = (0,2,3,5,7,8,10,11,13,15) [3] Q7.a.Give any two advantage of using Optical Fibres. [1] b. Indian School, in Mumbai is starting up the network between its different wings. There are Four Buildings named as SENIOR, JUNIOR, ADMIN and HOSTEL as shown below.: [4] SENIOR JUNIOR ADMIN HOSTEL The distance between various buildings is as follows: ADMIN TO SENIOR 200m ADMIN TO JUNIOR 150m ADMIN TO HOSTEL 50m SENIOR TO JUNIOR 250m SENIOR TO HOSTEL 350m JUNIOR TO HOSTEL 350m Number of Computers in Each Building SENIOR 130 JUNIOR 80 ADMIN 160 HOSTEL 50 (b1) Suggest the cable layout of connections between the buildings. (b2) Suggest the most suitable place (i.e. building) to house the server of this School, provide a suitable reason. (b3) Suggest the placement of the following devices with justification. Repeater Hub / Switch (b4) The organization also has Inquiry office in another city about 50-60 Km away in Hilly Region. Suggest the suitable transmission media to interconnect to school and Inquiry office out of the following . Fiber Optic Cable Microwave Radio Wave c. Identify the Domain name and URL from the following. [1] http://www.income.in/home.aboutus.hml d. What is Web Hosting? e. What is the difference between packet & message switching? f. Define firewall. g. Which protocol is used to creating a connection with a remote machine? [1] [1] [1] [1]

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