Computer Science, Class XII ( ) (Autumn Break-2015) (Holiday H.W) Chapter No.4 to 6, 11 to 13

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1 (Autumn Break-2015) (Holiday H.W) Chapter No.4 to 6, 11 to How does a class enforce data hiding, abstraction and encapsulation? Give a suitable example using a C++ code to illustrate the same. 2. What is the difference between the members in private visibility mode and the members in protected visibility mode inside a class? Also, give a suitable C++ code to illustrate both. /* CBSE 2012*/ 3. Differentiate between public and private visibility modes in context of Object Oriented Programming using a suitable example illustrating each. /* CBSE 2008*/ 4. Discuss the different ways by which we can declare a function in a class. Given suitable example of each. 5. What is static data member and static member function? Give suitable example using C++ code to illustrate them. 6. Differentiate between default, parameterized & copy constructor with a suitable example. /*CBSE 2005*/ 7. What is a copy constructor? Give a suitable example in C++ to illustrate with its definition within a class and a declaration of an object with the help of it. /*CBSE 2015*/ 8. Write any two similarities and dissimilarities between Constructors and Destructors. Write the function headers for Constructor and Destructor of a class Flight. /*CBSE 2007, 2011, 2013*/ 9. What do you understand by constructer overloading? Explain with example. /*CBSE 1998*/ 10. What are the different types of inheritance (Multiple, Hierarchical, Multilevel)? Explain all with an example in C++ code. 11. What is containership? How does it differ from inheritance? 12. Differentiate between Private and Protected members of class in context of inheritance using C++. /* CBSE 2007, 2008 */ 13. Rewrite the following program after removing the syntactical errors (if any). Underline each correction. #include <iostream.h> /* CBSE 2010*/ class FLIGHT { long FlightCode; char Description[25]; public void AddInfo( ) { cin>>flightcode; gets(description); void ShowInfo { cout<< FlightCode<< : <<Description<<endl; void main( ) { FLIGHT F; AddInfo.F( ); ShowInfo.F( ); Mohd. Hashim, PGT (Computer Sc.), hashim_mbd@yahoo.co.in,

2 14. Write the output of the following program. /*CBSE2014*/ #include<iostream.h> class Game { int level, score; char Type; Game(char GType='P') { level=1; score=0; Type=GType; void play(int GS); void change(); void show() { cout<<type<<"@"<<level<<endl; cout<<score<<endl; void main ( ) { Game A('G'), B; B.show(); A.play(11); A.change(); B.play(25); A.show(); B.show(); void Game::change() { Type=(Type=='P')?'G':'P'; void Game::play(int GS) { score+=gs; if (score>=30) level=3; else if (score>=20) level=2; else level=1; 15. Define a class BALANCED_MEAL in C++ with following description: Private Members: Access number Integer Name of Food String of 25 characters Calories Integer Food type String Cost Float AssignAccess( ) Generates random numbers between 0 to 99 and return it. Mohd. Hashim, PGT (Computer Sc.), hashim_mbd@yahoo.co.in,

3 Public Members A function INTAKE( ) to allow the user to enter the values of Name of Food, Calories, Food type, cost and call function AssignAccess() to assign Access number. A function OUTPUT( ) to allow user to view the content of all the data members, if the Food type is fruit. 16. Define a class STOCK in C++ with following description: /*CBSE2010*/ Private members Icode of type integer (Item code) Iname of type string (Item Name) Price of type float (Price of each item) Qty of type integer (Quantity in stock) Discount of type float (Discount percentage on item) A member function FindDisc( ) to calculate discount as per the following rule: If Qty<= 50 Discount is 0% If 50<Qty<= 100 Discount is 5% If Qty>100 Discount is 10% Public members: A function Buy( ) to allow user to enter values for ICode, ItemName, Price, Qty and call function FindDisc( ) to calculate the discount. A function ShowAll( ) to allow user to view the content of all the data members. 17. Define a class PhoneBill in C++ with the following descriptions. Private members: CustomerName of type character array, PhoneNumber of type long, No_of_units of type int, Rent of type int, Amount of type float. Member function Calculate( ) should calculate the value of amount as Rent+ cost for the units. Where cost for the units can be calculated according to the following conditions. No_of_units Cost First 50 calls Free Next 100 calls unit Next 200 calls unit Remaining calls unit Public members: * A function accept( ) which allows user to enter CustomerName, PhoneNumber, No_of_units and Rent and should call function calculate( ). * A function Display( ) to display the values of all the data members on the screen. 18. Define a class Teacher with the following class specification. /*CBSE1999*/ Private members: Name 20 characters, Subject 10 characters, Basic, DA, HRA, Salary float Calculate( ) function computes the salary and returns it. Salary is sum of Basic, DA and HRA Public members: ReadData( ): Function accepts the data values and invoke the calculate function. DisplayData( ):Function prints the data on the screen. Mohd. Hashim, PGT (Computer Sc.), hashim_mbd@yahoo.co.in,

4 19. Define a class named ADMISSION in C++ with the following descriptions: /* CBSE 2006 */ Private Members: AD_NO integer(ranges 10 to 2000) NAME Array of characters (String) CLASS character FEES float Public Members: Function Read_Data( ) to read an object of ADMISSION type. Function Display( ) to display the details of an object. Function Draw-Nos.( ) to choose 2 students randomly from an array of 100 objects of type ADMISSION passes as an argument to the function and display the details. Use random function to generate admission nos. to match with AD_NO from the array. 20. Answer the questions (i) and (ii) after going through the following class: /*CBSE 2015*/ class Passenger { long PNR; char Name[20]; Passenger( ) { cout<< Ready <<endl; //Function1 void Book (long P, char N[ ]) // Function2 { PNR=P; strcpy(name,n); void Print ( ) // Function3 { cout<<pnr<<name<<endl; ~ Passenger( ) { cout<< Booking cancelled <<endl; // Function4 void main() { Passenger P; //Line1 //Line2 //Ends here (i) Fill in the blank statements in Line1 and Line2 to execute Function2 and Function3 respectively. (ii) Which function will be executed at //Ends here? What is this function referred as? 21. Answer the following questions (i) and (ii) after going through the following class. /*CBSE 2006*/ class Exam { int Year; Exam( ) //Constructor 1 { Year=2015; Exam(int y) //Constructor 2 {Year=y; Exam(Exam &t); //Constructor 3 (i) Create an object, such that it invokes Constructor 2. (ii) In Object Oriented Programming, what is Constructor 1 referred as and when does it get invoked/called? Write its calling statement. (iii) (iv) Write complete definition for constructor 3 and what is the purpose of using it? Which feature Object Oriented Programming is demonstrated using Constructor1, Constructor2, and Constructor 3 in the above class text? Mohd. Hashim, PGT (Computer Sc.), hashim_mbd@yahoo.co.in,

5 22. Answer the questions (i) and (ii) after going through the following program: /*CBSE 2008*/ #include <iostream.h> #include<string.h> class bazaar { char Type[20], product [20]; int qty ; float price ; bazaar( ) //function 1 { strcpy (type, Electronic ) ; strcpy (product, calculator ); qty=10; price=225; public : void Disp( ) //function 2 { cout<< type << - <<product<< : << price << endl ; void main ( ) { Bazaar B ; //statement 1 B. disp( ) ; //statement 2 (i)will statement 1 initialize all the data members for object B with the values given in the function 1? (YES OR NO). Justify your answer suggesting the correction(s) to be made in the above code. (ii) What shall be the possible output when the program gets executed? (Assuming, if required _ the suggested correction(s) are made in the program). 23. Define a class Play in C++ with the following specifications: /*CBSE 2003*/ Private members of class Play Playcode, Noofscenes integer Playti tle 25 character Duration float Public member function of class Play A constructer function to initialize Duration as 45 and Noofscenes as 10. Newplay() function to take values for Playcode and Playtitle. Moreinfo() to assign the values of Duration and Noofscenes with the help of corresponding values passed as parameters to this function. Showplay() function to display all the datamembers on the screen. 24. Define a class Employee in C++ with the following specification: Private Members: ename an array of char of size[50] ( represent employee name) deptname an array of char of size[20] ( represent department name) salary integer ( represent total salary of an employee) bonus float CalBonus() This function calculate the total bonus given to an employee according to following conditions Deptname Bonus Accounts 4 % of salary HR 5% of salary IT 2% of salary Mohd. Hashim, PGT (Computer Sc.), hashim_mbd@yahoo.co.in,

6 Sales 3% of salary Marketing 4% of salary Public Members: Constructor to initialise ename and deptname to NULL and salary and bonus to 0. A function read_info to allow user to enter values for ename, deptname,salary & Call function CalBonus() to calculate the bonus of an employee. A Function disp_info() to allow user to view the content of all the data members. 25. Answer the questions (i) to(iv) based on the following code : /* CBSE 2008 */ class Dolls { char Dcode[5]; protected: float Price; void CalcPrice(float); Dolls(); void DInput(); void DShow(); class SoftDolls: public Dolls { char SDName[20]; float Weight; SoftDolls(); void SDInput(); void SDShow(); class ElectronicDolls: public Dolls { char EDName[20]; char BatteryType[10]; int Batteries; ElecronicDolls(); void EDInput(); void EDShow(); (i)which type of Inheritance is shown in the above example? (ii)how many bytes will be required by an object of the class ElectronicDolls? iii)write name of all data members accessible from member function of the class SoftDolls. (iv)write name of member functions accessible an object of the class ElectronicDolls? 26. Answer the questions (i) to(iv) based on the following code: /* CBSE 2007 */ class Trainer { char TNo[5],Tname[20],specialization[10]; int Days; protected : float Remuneration; void AssignRem(float); Trainer(); Mohd. Hashim, PGT (Computer Sc.), hashim_mbd@yahoo.co.in,

7 void TEntry(); void TDisplay(); class Learner { char Regno[10],LName[20],Program[10]; protected: int Attendance,grade; Learner(); void LEntry(); void LDisplay(); class Institute: public Learner, public Trainer { char ICode[10],IName[20]; Institute(); void IEntry(); void IDisplay(); (i)which type of inheritance is depicted by 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 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. 27. Answer the questions (i) to(iv) based on the following code: /* CBSE 2005 */ class Medicine { char Category[10], Company[20]; char Date_of_manufacture[10]; Medicine(); void entermedicinedetails(); void showmedicinedetails(); class Capsule: public Medicine { protected: char capsule_name[30]; char volume_lable[20]; float Price; capsules(); void entercapsuledetails(); void showcapsuledetails(); class Antibiotics: public Capsule { int Dosage_units; char side_effects[20]; int Use_within_days; Mohd. Hashim, PGT (Computer Sc.), hashim_mbd@yahoo.co.in,

8 Antibiotics(); void enterdetails(); void showdetails(); (i)how many bytes will be required by an object of class Medicines and an object of class Antibiotics respectively? (ii)write the names of all the members accessible from the object of class Antibiotics. (iii)write the names of all the members accessible from member functions of class capsules. (iv) What is the order of constructor execution at the time of creating an object of class Antibiotics?. 28. Consider the following and answer the questions given below: /* CBSE 1999 */ class vehicle { int wheels; protected: int passenger; void inputdata(int,int); void outputdata(); class heavy_vehicle: protected vehicle { int diesel_petrol; protected: int load: void readdata(int,int); void writedata(); class bus: private heavy_vehicle { char make[20]; void fetchdata(char); void displaydata(); (i)name the base class and derived class of the class heavy_vehicle. (ii)name the data member(s) that can be accessed from function displaydata( ). (iii)name the data member(s) that can be accessed by an object of bus class. (iv)is the member function outputdata( ) accessible to the objects of heavy_vehicle class? 29. What do you mean by DBMS? Give two advantages of DBMS. 30. What is a Candidate Key, Primary Key and Alternate key? Give suitable example of each from a table containing some meaningful data. /* CBSE 2006, 2007, 2008 */ 31. What do you understand by the terms Degree & Cardinality of a relation in relational database? /* CBSE 2005 */ 32. Explain the concept of Cartesian product between two relations, with the help of appropriate example. /* CBSE 2001, 2014 */ 33. What is a relation? What is the difference between a tuple and an attribute? /* CBSE 1998 */ 34. What do you understand by selection and projection operations in relational algebra? /* CBSE 2011 */ 35. What are DDL and DML? Give two examples of each. /* CBSE 2002, 2006 */ 36. Give the difference between DROP and DELETE Command of SQL with an example. 37. What is the difference between char and varchar2 data types? 38. What do you mean by constraint? Give its examples. Write similarity and dissimilarity between primary key and unique constraints. 39. What are aggregate functions? Give its example & explain any of one with an example. Mohd. Hashim, PGT (Computer Sc.), hashim_mbd@yahoo.co.in,

9 40. Consider the following tables Item and Customer. Write SQL commands for the statements (i) to (iv) and give output for SQL queries (v) to (viii). /* CBSE 2008 */ TABLE: ITEM I_ID ItemName Manufacturer Price PC01 Personal Computer ABC LC05 Laptop ABC PC03 Personal Computer XYZ PC06 Personal Computer COMP LC03 Laptop PQR TABLE : CUSTOMER C_ID CustomerName City I_ID 01 N Roy Delhi LC03 06 H Singh Mumbai PC03 12 R Pandey Delhi PC06 15 C Sharma Delhi LC03 16 K Agarwal Bangalore PC01 (i) To display the details of those Customers whose City is Delhi. (ii) To display the details of Items whose Price is in the range of to (Both values included). (iii) To display the CustomerName, City from table Customer and ItemName and Price from table Item, with their corresponding matching I_ID (iv) To increase the Price of all Items by 1000 in the table Item. (v) SELECT DISTINCT City FROM Customer; (vi) SELECT ItemName, MAX(Price), Count(*) FROM Item GROUP BY ItemName; (vii) SELECT CustomerName, Manufacturer FROM Item, Customer WHERE Item.I_Id=Customer.I_Id; (viii) SELECT ItemName, Price * 100 FROM Item WHERE Manufacturer='ABC'; 41. Write SQL commands (a) to (m) and outputs (n) to (s) on the basis of Teacher relation given below: No Name Age Department DateofJoin Salary Sex 1 Jugal 34 Computer 10-JAN M 2 Sharmila 31 History 24-MAR F 3 Sandeep 32 Maths 12-DEC M 4 Sangeeta 35 History 01-JUL F 5 Rakesh 42 Maths 05-SEP M 6 Shyam 50 History 27-JUN M 7 Manoj 44 Computer 25-FEB M 8 Rina 33 Maths 31-JUL F a) To show all information about the teachers of History department. b) To increment the salary by 20% of those teachers who is getting salary more than Mohd. Hashim, PGT (Computer Sc.), hashim_mbd@yahoo.co.in,

10 c) To display teacher name, age, department for male teachers from Teachers table. d) To list name of female teachers who are in History department. e) To list name and department of those teachers in which date of joining is before 24-MAR-98 from teacher table in descending order of their name. f) To insert a new row in teacher table with following data: 9, Rahul, 27, Computer, 10-SEP-98, 22500, M. g) To list name of all teachers with their join date in descending order. h) To show the name of those teachers who have first alphabet as S and third alphabet as n from teacher table. i) To display the second largest salary from teacher table. j) To count the numbers of those teachers who join before 12-JUL-97. k) To decrease the salary of all teachers of Maths department by 500. l) To find the total salary of those teachers who are working in Maths department. m) To delete the records of those teachers whose age is greater than equal to 40. n) select sum (Salary) from teacher where Department= History ; o) select count (distinct Department) from Teachers; p) select avg (Salary) from Teacher where DateofJoin > 31-JUL-97 ; q) select max (Age) from Teacher where Sex= F ; r) select count (*) from Teachers where DateofJoin < 12-JUL-97 ; s) select name, age, department from teacher where Sex= M ; 42. Consider the following tables FACULTY and COURSES. Write SQL commands for the statements (i) to (iv) and give outputs for SQL queries (v) to (viii) FACULTY F_ID Fname Lname Hire_date Salary 102 Amit Mishra Nitin Vyas Rakshit Soni Rashmi Malhotra Sulekha Srivastava Niranjan Kumar COURSES C_ID F_ID Cname Fees C Grid Computing C System Design C Computer Security 8000 C Human Biology C Visual Basic 6000 C Dreamweaver 4000 (i) To display details of those Faculties whose date of joining is before (ii) To display the details of courses whose fees is in the range of to (both values included). (iii) To increase the fees of Dreamweaver course by 500. (iv) To display F_ID, Fname of those faculties who charged more than15000 as fees. (v) (vi) Select COUNT(DISTINCT F_ID) from COURSES; Select MIN(Salary) from FACULTY,COURSES where COURSES.F_ID = FACULTY.F_ID; (vii) Select SUM(Fees) from courses Group By F_ID having count(*) > 1; (viii) Select Fname, Lname from FACULTY Where Lname like M% ; Mohd. Hashim, PGT (Computer Sc.), hashim_mbd@yahoo.co.in,

11 43. Consider following tables STOCK and DEALERS and write SQL commands for the questions (i) to (iv) and give outputs for SQL queries (v) to (viii). /* CBSE 2010 */ Tables: STOCK ItemNo Item Dcode Qty UnitPrice StockDate 5005 Ball Pen Mar Ball Pen Jan Gel Pen Premium Feb Gel Pen Classic Jan Eraser Small Mar Eraser Big Dec Sharpener Classic Jan-09 Tables: DEALERS Dcode Dname 101 Reliable Stationers 103 Classis Plastic 102 Clear Deals i) To display details of all items in the STOCK table in ascending order of StockDate. ii). To display Item No and Item name of those items from STOCK table whose UnitPrice is more than Rupees 10. iii). To display details of those items whose dealer code is 102 or quantity in stock is more than 100 from STOCK table. iv) To display maximum UnitPrice of items for each dealer individually as per Dcode from STOCK table. v) select count(distint dcode) from stock; vi) select Qty*UnitPrice from stock where itemno=5006; vii) select item, dname from stock S, dealer D where S.dcode=D.dcode and itemno=5004; viii) select min(stockdate) from stock; 44. State and verify following Boolean laws. (a). State and verify Associative Law? /* CBSE 2006, 2005 */ (b). State and verify De Morgan s theorem. /* CBSE 2006 Comp., 2007 */ (c). State and verify Distributive Law. /* CBSE 2006 */ (d) State and verify Absorption law in Boolean- Algebra algebraically. /*CBSE 2008, 2004, 2009*/ (e). State and verify third distributive Law. 45. Verify the following algebraically: /* CBSE 2010 */ X.Y + X.Y = (X +Y )(X+Y) 46. Name the law shown below and verify the following using a truth table: /* CBSE 2014 */ X + X. Y = X+Y 47. Draw a Logical Circuit Diagram for the following Boolean Expression: /* CBSE 2008 */ A. (B + C') 48. Draw the circuit diagram for the following Boolean expression : (A+B)(A +B)(A+B ) 49. Convert the following Boolean expression, into its equivalent Canonical Product of Sum Form(POS) : A. B'.C + A'. B. C + A'. B. C' /* CBSE 2008 */ 50. Convert the following Boolean expression into its equivalent Canonical Sum of Product Form(SOP): (X +Y+Z ).(X +Y+Z).(X +Y +Z).(X +Y +Z ). 51. Write the equivalent Canonical Product of Sum Expression for the following Sum of Product Expression F(X, Y, Z) = (0, 2, 4, 5) /* CBSE 2007 */ Mohd. Hashim, PGT (Computer Sc.), hashim_mbd@yahoo.co.in,

52. Write the equivalent expression for the following logical circuit: /* CBSE 2006 */ 53. Reduce the following Boolean expression using K-Map: /* CBSE 2006 Comp.

12 52. Write the equivalent expression for the following logical circuit: /* CBSE 2006 */ 53. Reduce the following Boolean expression using K-Map: /* CBSE 2006 Comp. */ F(P,Q,R,S)= (l,3,5,8,11,12,15 ) 54. Reduce the following Boolean expression using K-Map: /* CBSE 2006 */ F(P, Q, R, S) = π (0,3,5,6,7, 11, 12, 15) 55. Reduce the following Boolean expression using K - Map: /* CBSE 2009 */ H(U,V,W,Z) = Σ(0,1,4,5,6,7,11,12,13,14,15) 56. Reduce the following Boolean expression using K-Map: /* CBSE 2007 */ F(A, B, C, D) = π (5,6,7,8,9,12,13,14,15) 57. Obtain a simplified form for the following Boolean Expression using Karnaugh s Map : F(a, b, c, d) = (0, 1, 2, 4, 5, 7, 8, 9, 10, 11, 14) /* CBSE 2004 */ 58. Reduce the following Boolean expression using K - Map: /* CBSE 2013 */ F(U,V,W,Z) = Σ(0,1,2,3,6,7,8,9,10,13,15) 59. Write the SOP form of a Boolean function G, which is represented in a truth table as follows: /* CBSE 2010 */ P Q R G Write the POS form of a Boolean function F, which is represented in a truth table as follows: /* CBSE 2009*/ U V W F Mohd. Hashim, PGT (Computer Sc.), hashim_mbd@yahoo.co.in,

KENDRIYA VIDYALAYA TIRUMALAGIRI,SECUNDERABAD UNIT TEST II

KENDRIYA VIDYALAYA TIRUMALAGIRI,SECUNDERABAD UNIT TEST II SUB : COMPUTER SCIENCE CLASS : XII TIME : 90 MINS M.M: 40 1.a. Differentiate between default & parameterized constructor with suitable example.