KENDRIYA VIDYALAYA SANGATHAN ERNAKULAM REGION FIRST COMMON PRE BOARD EXAMINATION CLASS:XII - (COMPUTER SCIENCE )

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1 KENDRIYA VIDYALAYA SANGATHAN ERNAKULAM REGION FIRST COMMON PRE BOARD EXAMINATION CLASS:XII - (COMPUTER SCIENCE ) MaxMarks:70 Time Allowed :3 Hours Instructions: (i) All questions are compulsory. (ii) Programming language: C++ 1 a) What is the difference between break & continue statements with respect to their usage inside loop. Illustrate with a suitable example (2) b) Write the names of the header files, which is/are essentially required to run/execute the following C++ code: void main ( ) char C, String [ ] = "Excellence in Education"; for (int I=0; String[I]!= \0 ; I ++ ) C=toupper(String[I]); cout<<c ; (1) c) Rewrite the following program after removing all the syntactical errors (if any), underlining each correction. : (2) #include<iostream.h> #include<stdio.h> void main() struct emp char emp_name[15]; char emp_no; int salary = 5000; 1

2 EMPLOYEE; gets(emp_name); gets(emp_no); d) Find the output of the following program: (2) #include<iostream.h> #include<ctype.h> void main() char Mystring[ ] = What@OUTPUT! ; for(int i=0; Mystring [ i]!= \0 ;i++) if(!isalpha(mystring[i])) Mystring[i]= * ; else if(isupper(mystring[i])) else cout<< Mystring; Mystring[i]= Mystring[i]+1; Mystring[i]= Mystring[i+1]; e) Obtain the output of the following C++ program. Show the evaluation of the output (3) #inc1ude <iostream.h> struct POINT ; int X, Y, Z; void StepIn(POINT & P, int Step=1) 2

3 P.X+=Step; P.Y -=Step; P.Z+=Step; void StepOut(POINT & P, int Step=1) P.X-=Step; P.Y+=Step; P.Z-=Step; void main ( ) POINT P1=15, 25, 5, P2=10, 30, 20; StepIn(P1); StepOut(P2,4); cout<<p1.x<<, <<P1.Y<<, <<P1.Z<<endl; cout<<p2.x<<, <<P2.Y<<, <<P2.Z<<endl; StepIn(P2,12); cout<<p2.x<<, <<P2.Y<<, <<P2.Z<<endl; f) Go through the following C++ code and find out the possible output(s) from the suggested output options (i) to (iv).also write the least value and highest value, which can be assigned to the variable Guess (2) #include<stdlib.h> #include<iostream.h> void main() randomize(); int Guess,High=4; Guess = random(high) + 50; for(int C = Guess;C<=55;C++) cout<<c<< # ; 3

4 (i) 50#51#52#53#54#55# (ii) 52#53#54#55 (iii) 53#54#55# (iv) 51#52#53#54#55 2 a) What is copy constructor and parameterized constructor? Illustrate with an example (2) b) Answer the questions (i) and (ii) after going through the following class (2) class Maths char Chapter [20]; int Marks; public: Maths ( ) //Member Function 1 strcpy (Chapter, Geometry ); Marks = 10; cout<< Chapter Initialised ; ~Maths ( ) //Member Function 2 cout<< Chapter Over ; ; (i) Name the specific features of class shown by Member Function 1 and Member Function 2 in the above example. (ii) How would Member Function 1 and Member Function 2 get executed? c). Define a class RESORT in C++ with the following specifications: (4) Private Members Rno - to store Room No Name to store Customer Name Charges to store per day charges Days to store No of days of stay Amount to store total rent COMPUTE() To calculate total amount (Amount = days* charges) Member Functions 4

5 GetInfo() To enter values such as Rno,Name,Charges, Days and call COMPUTE( ) DispInfo() - To display the values Rno,Name,Charges, Days and Amount. d) Answer the Questions (i) to (iv) based on the following : (4) class Regular public: ; class Distance public: ; char SchoolCode[10]; void InRegular(); void OutRegular(); char StudyCentre[10]; void InDistance(); void OutDistance(); class Course:public Regular,private Distance public: ; char Code[10]; float fees; int Duration; void InCourse(); void OutCourse(); (i) Which type of Inheritance is shown in the above example? (ii) Write the names of all the member functions accessible from OutCourse() function of class Course 5

6 (iii) (iv) Write the names of data members accessible through the objects of class Course Is the function InRegular() accessible inside the function InDistance().Justify your answer. 3 a) Define a function SwapArray(int A[], int N). The function should rearrange the array in such a way that the values of alternate locations of the array are exchanged ( Assume the size of the array to be even) (3) Example : If the array initially contains 2, 5, 9, 14, 17, 8, 19, 16, then after rearrangement the array should contain 5, 2, 14, 9, 8, 17, 16, 19 b) An array ARR[5][5] is stored in the memory with each element occupying 2 bytes of space. Assuming the base address of ARR to be 1500, compute the address of ARR[2][4], when the array is stored : (i) Row Wise (ii) Column Wise (3) c) Write a function Row_Product() in C++which accepts a 2D array of integers and its size as arguments to print the product of each row (2) Example : If the array contains The output should be : Product of Row 1-6 Product of Row Product of Row 3-54 d) Evaluate the following postfix notation of expression:(show status of Stack after each operation) False, True, NOT, OR, True, False, AND, OR (2) e) Define functions push() to insert nodes for a linked list implemented stack having the following structure for each node : (4) struct node char Country[20]; node *Link; ; 6

7 4 a) Observe the program segment given below carefully and fill the blanks marked as Statement 1 and Statement 2 (1) #include<fstream.h> class PRODUCT public : ; int Pno; char Pname[20); int Qty; void ModifyQty( ) ; // The function is to modify quantity of a PRODUCT void PRODUCT: :ModifyQty ( ) fstream File ; Fil.open ("PRODUCT.DAT", ios::binary ios : : in ios: :out) ; int MPno; cout<<"product No to modify quantity : "; cin>>mpno; While (Fil.read ((char*) this, sizeof (PRODUCT)) if (MPno == Pno) cout<<"present Quantity:"<<Qty<<end1 ; cout<<"changed Quantity:";cin>>Qty ; int Position = ; //Statement 1 ; // Statement 2 Fil.write ((char*) this, sizeof (PRODUCT)) ; //Re-writing the record Fil.close ( ) ; 7

8 b) Write a function COUNT_DO() to count the occurrences of the word do in a text file MEMO.TXT. (2) c) Write a function Search_Calls() in c++ to search for details(phone No and Calls ) of those Phones which have more than 500 calls from a binary file phones.dat.assume that this binary file contains records / objects of class phone which is defined below. (3) class Phone char PhoneNo[10]; int calls; public: void Get() gets(phoneno); cin>>calls; ; void Billing() cout<<phoneno<< # <<calls; int GetCalls() return calls; 5 a) What do you understand by Primary Key? Give a suitable example of Primary Key from a table containing some meaningful data. (2) Consider the following tables for a database LIBRARY and answer the questions (b) and (c) Table :BOOKS Book_i Book_Name Author_Name Publishers Price Type Qty d C0001 Fast Cook Lata Kapoor EPB 355 Cookery 5 F0001 The Tears William Hopkins First Publ. 650 Fiction 20 T0001 My First C++ Brian & Brooke EPB 350 Text 10 T0002 C++ A W Rossaine TDH 350 Text 15 Brainworks F0002 Thunderbolts Anna Roberts First Publ. 750 Fiction 50 8

9 Table : ISSUED Book_id Quantity_issued T C F001 2 (b) Write SQL commands for statements (i) to (iv) (4) (i) (ii) To display Book name,author name and Price of books of First Publ. publishers To display the names and price from books in ascending order of their price (iii) To increase the price of all books of EPB publishers by 50 (iv) To display Book id,book Name and Quatity Issued for all books which have been issued. (c) Give outputs for the following SQL statements (v) to (viii) (2) (v) (vi) (vii) SELECT COUNT(*) FROM BOOKS; SELECT MAX(Price) FROM BOOKS WHERE QTY>=15; SELECT Book_Name,Author_Name FROM BOOKS WHERE Publishers = EPB ; (viii) SELECT COUNT(DISTINCT Publishers)FROM BOOKS WHERE Price>=400; 6a) State and prove Absorption law (2) b) Obtain Boolean Expression for the logic circuit shown below : (2) 9

10 c) Given the following truth table, derive a Sum Of Product(SOP) Boolean expression from it.(1) A B C F(A,B,C) d) Obtain a simplified form for the following Boolean Expression using Karnaugh s Map : (3) F(a, b, c, d) = Σ(0, 1, 2, 4, 5, 7, 8, 9, 10, 11, 14) 7 a) What are the different types of Modems? (1) b) Expand the following (1) (i) TCP/IP (ii) PPP c) What is web hosting? (1) d) ABC Systems Organization has set up its new center at Delhi for its office and web based activities. It has 4 blocks of buildings as shown in the diagram below: (4) 10

11 Center to center distances between various blocks Block A to Block B Block B to Block C Block C to Block D Block A to Block D Block B to Block D Block A to Block C 80m 250 m 50 m 190 m 125 m 100 m Number of Computers Block A 25 Block B 50 Block C 150 Block D 10 (i) (ii) (iii) Suggest a cable layout of connections between the blocks. Suggest the most suitable place (i.e. block) to house the server of this organization with a suitable reason. Suggest the placement of the following devices with justification (i) Repeater (ii) (ii) Hub/Switch 11

12 (iv) The organization is planning to link its International Office situated in Mumbai, which wired communication link, you will suggest for a very high speed connectivity? e) Differentiate Hackers and Crackers (1) f) Out of the following scripts identify Client side script(s) and Server side script(s) (1) (i) JavaScript (ii) ASP (iii) VBScript (iv) JSP g) What do you mean by cookie (1) 12

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