void display(){ cout << trainno.<< :>>Description<<endl; }; void main() {TRAIN T; Entry.(); Display.(); d) 410 e) i) south:east:south f) temttoe

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1 Marking Scheme SUBJECT COMPUTER SCIENCE Class XII Ist Preboard 2016 Q. No. 1 a) 1 Marks for definition and 1 marks for explain relation with classes objects. the wrapping of data and operation / function into a single unit (called class) is known as Encapsulation b) ½ marks for each correct header file. (String.h and stdio.h) c) ½ marks for each correct error.full marks for correct program.the errors are underline. #include<iostream.h> #include<stdio.h> class TRAIN) long trainno; char description[25]; name[20]; public: void entry( ) cin>>trainno;gets(description); void display() cout << trainno.<< :>>Description<<endl; ; void main() TRAIN T; Entry.(); Display.(); d) 410 e) i) south:east:south f) temttoe Q.No.2 a) 1 marks for correct definition and 1 marks for example. When one constructor overloaded another constructor is called constructor overloading). #include <iostream.h> class Area private: int length; int breadth; public: Area(): length(5), breadth(2) ; Area(int l, int b) length(l), breadth(b) void GetLength() cout << "Enter length and breadth respectively: "; cin >> length >> breadth; int AreaCalculation() return length * breadth;

2 ; void DisplayArea(int temp) cout << "Area: " << temp << endl; b) 1 marks for each correct answer. I) Function 1 referred as destructor. And it is called or invoked when constructor goes out of scope. ii) Function 1 is default constructor and function 3 referred as parameterized constructor. c) 1 marks for each correct header file and class declration,1 marks for write data member and member function and visibility mode,1 marks for function definition. Full marks for correct program. d) i) 1 marks for members- char titile,char author,int no_of_pages,char topic. ii) 1 Marks for char title,char author,int no.of pages,int no. of chapters,no.of assignments. iii) 1 Marks for char topic,int no.of chapters,no.of assignments. iv)1 Marks for correct size of an object of class physics 72.. Q. No. 3 a) 1 marks for coreect function definition,arguments,array loop.and 1 marks for correct logic. Full marks for correct coding. void row multi(int A[4][6],int R,int C) int multi[r]; for(int i=0;i<r;i++) multi[i]=1; For(int j=0;j<c;j++) Multi[i]*=A[i][j]; Cout<< multiplication of row <<i+1; << = <<multi[i]<<endl; 1 marks for definition and 1 marks for defined relation. b)1 Marks for use of correct formula and 1 marks for correct base address and full marks for correct solution For column wise allocation Address of a[i][j]=ba+w(j-lc)*m+(i-lr) Array[4][5]=base address(array)+8*(5*20+4) 100=ba+8*104=BA+832 So ba= =168 Thus the address of array [2][3]=168+8(3*20+2)=168+8*62= =664. c) 1 marks for function declaration,1marks for logic/full marks for correct function definition. Void queue::qinsert( ) node*temp; Temp=new node; Cout<< enter the employee name ; Gets(temp->name); Temp->link=null; If(rear==nul) Rear=temp;front=rear;else Rear-> link=temp; Rear=temp;

3 d) ½ Marks for function declaration and 1 marks for loop. Full marks for correct function definition and logic. Void SWARARR(int arr[4][4],int m, int n) Int I,j; Cout << the original array ; For (i=0;i<m;i++) For (j=0;j<n;j++) cout<<arr[i][j];<< \t ; Cout<< after swapping ; Int temp; Int k=m=1; For(i=0;i<n;i++) Temp=arr[0][i]; Arr[0][i]=arr[k][i]; Arr[k][i]=temp; For(i=0;i<m;i++) For(j=0;j<n;j++) Cout<<arr[i][j]; e) 1 marks for steps of push and pop, full marks for coreect push and pop element and result - 75 Q. No. 4 a) 1 Marks for correct coding. The statement is- file.seekp(record-1)*sizeof(c ); or file.seekp(-sizeof(c );ios::curr); b) 1 Marks for definition of function and 1 marks for correct answer. Void count() Ifstream fil( story.txt ); Char str[10]; Int count=0; While(!fil.eof)) fil>>sre; If(strcmp(str, He )==0 strcmp(str, She )==0) Count++; Cout<< count of He/She in the file : <<count<<endl; File.close( ); c) ½ marks for correct definition and 1 marks for correct file open and full marks for correct function. Void vowelword( ) Ifstream fin; oftream fout; Char ch; Fin.open( text.txt,ios::in ios::open); Fout( text1.txt,ios::out ios::open); While(!fin.eof( )) Fin.read( (char*)&ch,ssize of (ch)); If (ch!=( A E I o U )==0) Fout.write(char*)&ch,sizeof(ch));

4 Fin.close(); Fout.close(); d)1 Marks for each correct definition. fstream and ofstream. Q. No.5 a) ½ Marks for each correct definition and 1 marks for correct example of Drop and delete command. b)1 Marks of each corret command for queryi) SELECT * from consignor where city = delhi ; ii) SELECT * from consignee where price between AND 55000; iii) SELECT A. consignorname,a.city,b.consigneename,b.price from consignora,consigneeb where A.I_ID=B.I_ID; iv) update consignee set price=price+1000; output; i) city- Banglore,Delhi,Mumbai, ii) ItemName MAXPrince Count(*) Laptop Personal Computer iii) customername Menufacturer NROy PQR Csharma PQR K Agrawal ABC Hsingh XYZ R Pndey COMP IV)ITEMNAME PRICE*100 Personal Computer Laptop Q.No.6 a)1 Marks for correct Associative low X+(Y+Z)=(X+Y)+Z AND X(YZ)=(XY)Z.and 1 marks for correct truth table. b) 1 marks for correct truth table. c)1 Marks for correct k-map.1 Marks for declaration of reduction,1 marks for steps of reduction.full Marks for desired answer. F=BC +AB D+ABD K-map is d) the sum of product for is =(U +V+W ).(U+V +W ).(U+V+W ))

5 ((U +V+W ) +(U+V+W ) +(U+V+W ) ) =(UV W+U VW +U V W) Q No. 7 i) 1 Marks for each correct definition of swithing technique.. ii) 1 Marks for correct definition of W3C that is world wide web consortium.. iii) ½ Marks for correctexample of free software that is adobe reader,mozila firefox, google chrome. iv) ½ marks for correct definition of IP address and ½ marks for suitable reason. e).

KENDRIYA VIDYALAYA SANGATHAN (KOLKATA REGION) Second Pre Board Examination ( ) COMPUTER SCIENCE (Theory) Class-XII Marking Scheme

KENDRIYA VIDYALAYA SANGATHAN (KOLKATA REGION) Second Pre Board Examination (2014-15) COMPUTER SCIENCE (Theory) Class-XII Marking Scheme Ques. 1 a) [1] Automatic Type Conversion Type casting It is also