Guru Harkrishan Public School, Karol Bagh Pre Mock Class XII Sub: COMPUTER SCIENCE Allowed :3 hrs

Size: px

Start display at page:

Download "Guru Harkrishan Public School, Karol Bagh Pre Mock Class XII Sub: COMPUTER SCIENCE Allowed :3 hrs"

Randolph Collins
5 years ago
Views:

1 Guru Harkrishan Public School, Karol Bagh Pre Mock Class XII Sub: COMPUTER SCIENCE Time Allowed :3 hrs M.M. 70 Please check that this question paper contains 9 printed pages. Please check that this question paper contains 7 questions. Write down the serial number of the question before attempting it. Note.(i) All questions are compulsory. (ii) Programming Language :C (a) What is the difference between Actual parameter and Formal parameter? Also give a suitable C++ code to illustrate both. 2 (b) Write the names of the header files, Which is/are essentially required to run/execute the following C++ code : 1 void main() int r=35; for(int i=1;i<=r;i++) cout<<i<< : <<pow(r,i)<<endl; (c) Rewrite the following program after removing the syntactical errors (if any). Underline each correction. 2 All the desired output files already included in the code, which are required to run the code. Typedef char[80] st; void main() txt st; gets(txt); cout<<txt[0]<< \t<<txt[2]; cout<<txt<<endline; (d) Find the output of the following program : 2 #include <iostream.h> void main( ) int Numbers[ ] = 2, 4, 8, 10 ; int *ptr = Numbers : for (int C = 0 ; C < 3 ; C++) cout << *ptr ; ptr++ ; cout << endl ; 1

2 (e) (f) for (C = 0 ; C < 4 ; C++) (*ptr)* = 2 ; ptr ; for (C = 0 ; C < 4; C++) cout << Numbers[C] << # ; cout << endl ; Observe the following C++ code carefully and obtain the output, which will appear on the screen after execution of it. 3 #include <iostream.h> class Mausam int City, Temp, Humidity; Mausam(int C=1) City=C; Temp =10; Humidity=63; void Sun(int T) Temp+=T; void Rain(int H) Humidity+=H; void CheckOut ( ) cout<<city<< : <<Temp<< & <<Humidity<< % <<endl; ; void main ( ) Mausam M, N (2) ; M.Sun (5) ; M.CheckOut ( ) ; N.Rain (10); N.Sun (2) ; N.CheckOut ( ) ; N.Rain (15); M.CheckOut ( ) ; Study the following program and select the correct option(s) out of the four choices given below as the possible set of such numbers generated from the program code. Justify your answer. 2 #include<iostream.h> #include<stdlib.h> const int MIN = 25 ; void main( ) randomize ( ); int SCORE = 10, Num; for (int i = 1 ; i <= 4 ; i ++ ) Num = MIN + random (SCORE ); 2

3 cout << Num << : ; SCORE ; (i) 34:31:30:33: (ii) 29:33:30:31: (iii) 34:31:30:31: (iv) 34:31:29:33: 2. (a) Explain the use of inline function in C++ with the help of an example 2 (b) Answer the Questions (i) and (ii) after going through the following class : 2 class Test int Regno, Max, Min, Score ; TEST ( ) //Function 1 Regno = 101 ; Max = 100 ; Min = 40 ; Score = 75 ; TEST(int Pregno, int Pscore) //Function 2 Regno = Pregno ; Max = 100 ; Min = 40 ; Score = Pscore ; ~TEST( ) // Function 3 cout << Test Over << end1 ; void Display( ) //Function 4 cout << Regno << : << Max << : << Min << end1 ; cout << [ Score] << Score << end1 ; ; (i) As per Object Oriented Programming, which concept is illustrated by Function 1 and Function 2 together? (ii) what is Function 3 specifically referred as? when do you think, Function 3 will be invoked/called? (c) Define a class outfit with the following description: 4. Private members: Ocode of string type Otype of string type Osize of integer type Ofebric of string type Oprice of type float A function initprice() which calculates and assigns the value of Oprice as follows: 3

4 For the value of Ofebric DENIM Otype Oprice TROUSER 1500 JACKET 2500 For Ofebric other than DENIM the above mentioned Oprice gets reduced by 25%. Public members: A constructor to assign intial valued of Ocode, Otype and Ofebric with the word Not Initialised and Osize and Oprice with 0. A function input()( to input the value of data members Ocode, Otype, Osize and Ofebric and invoke the initptice() function. A function display() which displays the content of all data members for an outfit. (d) Answer the questions (i) to (iv) based on the following : 4 class chairperson long CID ; // Chairperson Identification Number char CName [20] ; protected : char Description [40] ; void Allocate( ) ; Chairperson( ) ; void Assign( ) ; void Show( ) ; ; class Director int DID ; //Director ID char Dname[20] ; protected : char profile[30] ; Director( ) ; void Input( ) ; void output( ) ; ; class company : private chairperson, public Director int CID ; //Company ID char City[20], country [20] ; 4

5 company( ) ; void enter( ) ; void Display( ) ; ; (i) Which type of Inheritance out of the following is speciafically is illustrated in the above C++ code? (a) Single Level Inheritance (b) Multi Level Inheritance (c) Multiple Inheritance (ii) Write the names of data members, which are accessible by objects of class type Company. (iii) Write the name of all the member functions, which are accessible by objects of class type Company. (iv) Write the names of all members, which are accessible from member functions of class Director. 3. (a) Write a function Get1( ) in C++ to transfer the content from two arrays first[ ] and second[ ] to array all[ ]. The even places (0,2,4,...) of array all[ ] should get the content from the array first [ ] and odd places (1,3,5,... ) of the array all [ ] should get the content from the array second[ ]. 3 Example: if the first [ ] array contains 20,40, 60 And the second array contains 10, 50, 80 The all [ ] array should contain 20,10,40,50,60,80 (b) An array Arr[50][10] is stored in the memory along the row with each element occupying 2 bytes. Find out the address of location Arr[20][50], if the location Arr[10][25] is stored at the address (c) Write a function in C++ to Delete an element in a dynamically allocated Queue where each node contains a real number as data. Assume the following defination of MYNODE for the same: 4 struct MYNODE float num ; MYNODE *Link ; ; (d) Define a function DIAGSUM ) in C++ to find sum of diagonal elements from N* M matrix. 2 (e) Evaluate the following postfix notation of expression (show status of stack after execution of each operation): 5, 20, 15, -, *, 25, 2, *, (a) Observe the program segment given below carefully, and answer the question that follows: 1 class candidate 5

6 (b) (c) long CId ; // Candidate s Id char Cname[20] ; // Candidate s Name float Marks ; // Candidate s Marks void Enter ( ) ; void Display ( ) ; void MarksChange ( ) ; // Function to change marks long R_CId ( ) return CId ;) ; void Marksupdate (long ID) fstream File ; File.open ( CANDIDAT.DAT, ios : : binary ios : : in ios : : out); Candidate C ; int Record = 0, Found = 0 ; while (!Found && File.read((char*)&C, sizeof(c))) if (Id == C.R_CID( )) cout << Enter new Marks ; C.markChange( ) ; // Statement 1 // Statement 2 Found = 1 ; Record++ ; if (found == 1) cout << Record Updated ; File.close( ) ; Write the Staement1 to position the File Pointer at the beginning of the Record for which the candidate s Id matches with the argument passed, and Statement 2 to write the updated Record at that position. Write a function in C++ to count the number of lowercase alphabets present in a text file ARTICLE.TXT. 2 Given a binary file TELEPHON.DAT, containing records of the following class Directory: 3 class Directory char Name [20] ; char Address [30] ; char AreaCode [5] ; char Phone_No [15] ; 6

7 void Register ( ) ; void Show ( ) ; int CheckCode(char AC [ ]) return strcmp (AreaCode, AC) ; ; Write a function COPYABC( ) in C++, that would copy all those records having AreaCode as 123 from TELEPHON.DAT to TELEBACK.DAT. 5. (a) What do you understand by Union and Cartesian Product in relational alzebra? 2 NOTE: Write sql queries for (b) to (g) and write the outputs for the SQL Queries mentioned in (h1) to (h4) parts on the basis of tables PRODUCTS and SUPPLIERS TABLE PRODUCTS PID PNAME QTY PRICE COMPANY SUPCODE 101 DIGITAL CAMERA RENIX S DIGITAL PAD DIGI POP S PEN DRIVE STOREKING S LED SCREEN DISPEXPERTS S CAR GPS SYSTEM MOVEON S03 TABLE SUPPLIERS SUPCODE SNAME CITY S01 GET ALL INK KOLKATA S03 EASY MARKET CORP DELHI S02 DIGI BUSY GROUP CHENNAI (b) To display the details of all the products in ascending order of product name(i.e PNAME) 1 (c) To display the product name and price of all those products whose price is in the range of to (both values included) 1 (d) To display the number of products which are supplied supplier i.e, the expected output should be : SO1 2 S02 2 S (e) To display the price, product name and quantityof those products which have quantity more than (f) To display the names of those suppliers, who are either from DELHI or from KOLKATA. 1 (g) To display the names of the companies and the name of the products in descending order of company names. 1 (h) Write the outputs for the following SQL queries. 2 7

8 (h1) SELECT DISTINCT SUPCODE FROM PRODUCTS. (h2) SELECT max(price), min(price) from products (h3) SELECT Price*QTY AMOUNT from products WHERE PID=104; (h4) SELECT PNAME,SNAME FROM PRODUCTS P,SUPPLIERS S WHERE P.SUPCODE=S.SUPCODE AND QTY> (a) State Associative Law and verify the same using logic gates. 2 (b) For the given truth table, give canonical sum of product expression 2 X Y Z F (c) Draw logic circuit diagram for the following expression: Y = AB + B C + C A 2 (d) Reduce the following Boolean expression using K-Map : Y (A,B, C, D) = p(0,1,3,5, 6, 7, 10,14,15) 2 7. (a) Write two characterstics of WI-Fi? 1 (b) What is the difference between chat and .? 1 (c) Expand the following 1 (i) GPRS (ii) GSM (d) Which type of network (out of LAN, MAN,PAN) is formed,when you connect two mobiles using bluetooth to transfer a video? 1 (e) Quick learn university is setting up its Acedmic blocks at Sultan Nagar and planning to set up a network. The university has 3 academic block and one human resource center as shown in the diagram below: BUSINESS BLOCK TECHNOLOGY BLOCK LAW BLOCK HR CENTER Center to center distances between various blocks is as follows: 8

9 law block to Business block law block to Technology block law block to HR center Business block to Technology block Business block to HR center Technology block to HR center 40m 80 m 105 m 30m 35 m 15 m Number of Computers Law Block TECHNOLOGY BLOCK HR Center Business Block e1. Suggest a cable layout of connections between the blocks/center for a wired connectivity. e2. Suggest the most suitable place (i.e.block/center) to install the server of this university with a suitable reason. e3. Which device you will suggest to be placed /installed in each of these blocks/center to efficiently connect all the computers with in these blocks center? e4. The university is planning to connect its admission office in the closet big city, which is more than 250 KM from university which type of network out of LAN, MAN or WAN will be formed? Justify your answer. 9

CBSE Sample Paper 2015 Computer Science C++ Class XII Time 3hrs M.M 70

CBSE Sample Paper 2015 Computer Science C++ Class XII Time 3hrs M.M 70 Q1. A) Write short notes on typedef and #define. 2 Q1B) Give the Header files to run the following code. 1 void main() cout