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1 KENDRIYA VIDYALAYA SANGATHAN, CHENNAI REGION Sub : Informatics Practices (065) Time allowed : 3 hours Maximum Marks : 70 Marking Scheme. a. Mrs Ruchi is planning to connect all the 5 computers in her office to make a LAN. Suggest an intelligent network device to connect all the nodes Switch b. Mrs reshma wants to send/receive over TCP/IP networks(internet).which protocol she can use for this purpose? SMTP(Simple Mail Transfer Protocol) c. An Internet Service Provider has a network within a city area. Which type of network is it? MAN (Metropolitan Area Network) d. Which transmission technology can we use for connecting two countries over an ocean? Satellite e. What is the difference between free software and freeware? Free software : Freely accessible, freely used,changed,improved,copied and distributed to all. No payments required. Source code available. Freeware : Freely available, freely used but it has stipulated time, after period of time, license fee should be paid. -each explanation mark f. Mrs Kamini is not clear about the wireless and wired media of communication kindly describe it to her with suitable example. Wired Media : It is the physical connection for connecting different devices on network. Also called Guided Media. different types cable can be used like coaxial cable, optical fibe,etc. Wireless Media: No any physical connection between the devices on network. Also called Un-guided media. Different unguided media can be used like microwave, radiowave, satellite, Bluetooth etc. -each explanation mark g. What is DOS(Denial of Service) attack? Explain briefly. DOS (denial of Service) : types of attacks that prevent the legitimate users of the system.from accessing or using the resources, information or capabilities of the system. marks (a) Write HTML code to produce a Textarea with 0 rows and 30 columns. <TEXTAREArows=0cols=30name= tarea >

2 ( mark for correct answer) (b) What properties of list box he/sheshould enable/select there for random selection with multipleitems. Multiple_interval ( mark for correct answer) (c) Differentiatebetweenbreakand continue in Java. If break is executed control terminates from the complete iterations includingthe remainingstatements in the current iteration. But Continuewillcontinuewith thenext iteration byjustskippingthecurrent iteration. ( mark for correct answer) (d) Write any two difference between XML and HTML. HTML XML (e) (f) (g) Displays the data Uses pre-defined tags Describes the data Creates user-defines tags ½ marks for each difference What will be thevalue ofa and b after execution of the following code: inta=,b=; if(++a<5) { a* = ++b; } a= 6 b=3 ( mark for each correct answer) What do you mean by the rowspan attribute of <td> tag in HTML? Explain using an example. Rowspan attribute of <TD> tag specifies the number of rows to be joined or merged in an HTML table. e.g: <TD ROWSPAN = "" > Subject </TD> will join two rows. ( Mark for each explaining & mark for example) Write java code that gets numbers from two textfields jtf and jtf and interchange their values. int a,b,c; a= Integer.parseInt(jTF.getText()); b= Integer.parseInt(jTF.getText()); c=a; a=b; b=c; System.out.println( a= +a); System.out.println( b= +b); (/ marks for input, / marks for output, mark for interchange concept)

3 3. (a) One user made some changes in the table but now he want to discard all the changes so help him to find out the command which he will use to discard the changes in the database. Rollback To (b) While creating the table Employee, Mr John forgot to include the field EMPNO, now how to insert the EMPNO field with integer data type and 0 size into the Employee table? Alter Table Employee Add (EMPNO int(0),mgr int(0)); ( marks for correct Alter Table command and marks for correct add command) (c) How is PRIMARY KEY constraint different from UNIQUE constraint? Primary key is same as unique but it is used to refer as a foreign key in other table. Primary key not allow null value but unique allow null value. (d) (e) (f) What is the purpose of following MySQL query? SELECT MAX(SALARY) MIN(SALARY) FROM SALARY; Difference between maximum and minimum salary value. Write a MySQL statement to display Today the date is <current date and time> Example: Today the date is :40:5 Select concat( Today the date and time is,now()); Mrs. Simtha wants to delete all the rows from the EMPLOYEE table. EMPLOYEE table has the following columns (empid,sal,job) where job is a not null column. Help her to delete all rows from table. (g) DELETE ALL FROM EMPLOYEE ; Consider the table student given below. Find out the output of the following queries: Student a) Select count(*) from Student; 3 b) Select count(fees) from Student; Rno Fees Null Null

4 4 4 (a) What is method overloading in java? Method overloading defines two or more methods with the same name but with different signatures. Method overloading is done in the same class. ( mark for correct answer) (b) Priyawants to receive user input throughadialog box.which typeof dialogboxcan she use forthis purpose? showinputdialog ( mark for correct answer) (c) Howmanytimes the followingloopget executed for(int W=5,L=40; W<=L;W=W+0) jtextarea.settext(jtextarea.gettext()+""+w); 4 ( mark for correct answer) (d) What will be the contents in the jtextfield and jtextfield after the following code? jtextfield.settext(math.round(45.496)+" "); jtextfield.settext(jtextfield.gettext().substring(,5)+"hello".touppercase()); jtextfield=45 jtextfield=5hello ( mark for each textfield correct answer) (e) Rewrite the following code using for loop: int i = ; while( i++ < 5 ) { System.out.println( "i = " + i ) ; i++ ; } for(int i=;i++<5;i++) System.out.println( "i = " + i ) ; ( mark for correct loop answer mark for correct display) (f) Write theoutputof the followingcode segment: int j=0,x=0,i=0; for(i=;i<=4;i++) { if(i% == 0) x=x+(i * j); j=j-; } System.out.println(x); 3 ( marks for correct output) (g) Rekha is a programmer in Blue Bus Travels. She has developed the following GUI to calculate the ticket amount. ~

() ) Write code for the following a) Display the kilometers according to the chart been shown above in the textfield () b) Calculate the amount based on

5 City Kilometers Delhi 000 Mumbai 800 Pune 00 Hyderabad 500 Goa 600 Trivandrum 800 A/C charge per km Non A/C charge per km Rs. 5/- Rs 0/- ) Which method is used to determine which city is been selected? () ) Write code for the following a) Display the kilometers according to the chart been shown above in the textfield () b) Calculate the amount based on number of persons, ac or non ac bus and display in the amount textfield. (3) 3) State the methods used in the following buttons () a) Reset b) Stop ) getselecteditem() ( mark for correct answer) ) int n; n = jcombobox.getselectedindex(); switch(n){ case 0:

6 jtkm.settext( 000 ); case : jtkm.settext( 800 ); case : jtkm.settext( 00 ); case 3: jtkm.settext( 500 ); case 4: jtkm.settext( 600 ); case 5: jtkm.settext( 800 ); } ( mark to calculate the kilometers according to the chart) (b) int amt,km,nop; km = Integer.parseInt(jTKM.getText()); nop = Integer.parseInt(jNOP.getText()); if(jradiobutton.isselected()){ amt = 5 * km * nop; } else{ amt = 0 * km* nop; } jamt.settext( +amt); (3 mark for correct coding) 3) a) Reset : jtkm.settext( ); jkm.settext( ); jamt.settext( ); b) System.exit(0); ( ½ mark for each correct method ) 5. (a) How is Cross-Join different from Equi-Join? In equi join values of both table are matched on the basis of common field and it will

7 display only matching rows. In cross join sql will not perform any matching it will display each row of first table with each row of second table(mxn rows). (b) Write output of the following MySQL queries : i) SELECT DAYOFMONTH(NOW()); Returns the day of the month of the current date. ii) SELECT ROUND(40.95,-); 00 iii) SELECT INSTR( Corporation, or ); iv) SELECT CONCAT( India, NULL, Australia ); NULL (c) Consider the table given below, write command in MySQL for () to (4) and output for (5) to (8). Table : STUDENT 6 SNO NAME STIPEND STREAM AVGMARK GRADE CLASSSEC Karan 800 Medical 67.8 C D Vishu 500 Commerce 8.6 B B 3 Prabhat 000 Humanities 85.7 NULL J 4 Selina 700 Medical 88.9 A C 5 Vinod 900 Science 65.9 C D 6 Karan 00 Medical 68.6 NULL J (Only for query marks for correct, / marks for partially correct query) () To display the name and stream of all students who are in class. () Select * From STUDENT Where CLASSSEC LIKE % ; () To display the different Streams available for students. () Select Distinct STREAM From STUDENT; (3) To display name, avgmarks and grade in descending order of grade. () Select NAME, AVGMARKS, GRADE, From STUDENT Order By GRADE DESC; (4) To display names of those students whose grade and section are same. () Select NAME From STUDENT Where GRADE= Right(CLASSSEC, ); (5) SELECT STIPEND+500 FROM STUDENT WHERE STREAM LIKE %a% ; (/) STIPEND

8 (6) SELECT COUNT(*) FROM STUDENT WHERE GRADE= C AND STIPEND>=800; (/) COUNT(*) (7) SELECT CLASSSEC FROM STUDENT WHERE AVGMARKS>68 && STREAM= Medical ; (/) CLASSSEC C J (8) SELECT MAX(STIPEND) FROM STUDENT ; (/) MAX(STIPEND) (a) Create two tables: First Table: Customer ( customer_id, name ) Second Table: Customer_Sales ( transaction_id, amount, customer_id) Underline columns indicate primary keys and customer_id indicates foreign key in Customer_Sales Table and maintain the referential integrity with Customer table. As per requirement you can assume data types and size of the fields. First table command: Create Table Customer ( customer_id int(5) Primary key, name varchar(0)); Second table command: Create Table Customer_Sales ( transaction_id int(5) Primary key, amount decimal(9,), customer_id int(5), foreign key (customer_id) references Customer(customer_id)); ( marks for correct first table marks for correct second table.)

9 (b) In a database there are two tables LOAN and BORROWER as shown below: LOAN Loan_number Branch_name Amount L-70 Downtown 3000 L-30 RedWood 4000 L-60 Perryridge 700 (c) BORROWER Customer_Name Loan_number Jones L-70 Smith L-30 Hayes L-70 (i) Identify the foreign key column in the BORROWER table. Loan_number ( marks for correct answer) (ii) How many Tuples and Attributes will be there in the unrestricted join of these two tables? Tuples -9,Attributes-5 (/ marks for each correct answer) Consider the following tables Stationery and Consumer. write command in MySQL for (i) to (iv) and output for (v) to (vi). Stationery S_ID StationeryName Company Price DP0 Dot Pen ABC 0 PL0 Pencil XYZ 6 ER05 Eraser XYZ 7 PL0 Pencil CAM 5 GP0 Gel Pen ABC 5 Consumer C_ID ConsumerName Address S_ID 0 Good Learner Delhi PL0 06 Write Well Mumbai GP0 Topper Delhi DP0 5 Write & Draw Delhi PL0 6 Motivation Bangalore PL0 (i) Write a query to display Consumer name, Address, Company, Price for those whose price is not more than 0. Select ConsumerName, Address, Company, Price From Stationery, Consumer Where Stationery.S_ID = Consumer.S_ID AND Price<0; 6

10 (ii) Display the company whose consumers are located in Delhi or Mumbai. Select Company From From Stationery, Consumer Where Stationery.S_ID = Consumer.S_ID AND Address = Delhi OR Address = 'Mumbai'; (iii) Display Stationery ID, Stationery name and Address of consumer order of Stationery Name. Select S.S_ID, StationeryName, Address From Stationery S, Consumer C Where S.S_ID=C.S_ID Order By StationeryName; (iv) Write a query to display Stationery ID, Stationery name Company name descending order of price. Select S_ID, StationeryName,Company From Stationery Order By Price desc; (v) SELECT Company, ConsumerName, Address FROM Stationery S, Consumer C WHERE S.S_ID= C.S_ID; Company ConsumerName Address ABC Topper Delhi XYZ Write & Draw Delhi CAM GOOD Learner Delhi CAM Motivation Bangalore ABC Write Well Mumbai (vi) SELECT Company, COUNT(*) FROM Stationery GROUP BY company; Company COUNT(*) ABC XYZ CAM 7. a. How e-governance benefited the common man? The number of trips to government offices reduced by nearly % to 7%. Bribes reduced by 50% to 90%. b. In your own language, what all features would you suggest for an effective front end? Ease of use User friendliness Conventional use of words and terms Simple and uncluttered look c. Mr. Manoj is developing one software for the bank. He wishes to create controls on a form for the following functions. Choose appropriate controls from Text field, Label, Radio button, Check box, List box, Combo box, Button and write in the third column. S. No. Control used to Control

11 Enter Account number Select Account Type (Saving, Current, Fixed Deposit) 3 Select Branch 4 Clear the Form S. No. Control used to Control Enter Account number Text Box Select Account Type (Saving, Current, Fixed Deposit) list box/ combo box/radio button 3 Select Branch list box/ combo box/radio button 4 Clear the Form Button

SAMPLE PAPER: 2015 Class :XII Subject : Informatics Practices. Time: 3 hrs. M.M. 70. Section A

SAMPLE PAPER: 2015 Class :XII Subject : Informatics Practices Time: 3 hrs. M.M. 70 Instructions: i) All questions are compulsory. ii) Programming language:java Section A a) What is foreign key and Candidate