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CBSE Class 12 Board Exam 2015 : Informatics Practices

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SET-4 Series SSO Code No. 90 Candidates must write the Code on the Roll No. title page of the answer-book. Please check that this question paper contains 8 printed pages. Code number given on the right hand side of the question paper should be written on the title page of the answer-book by the candidate. Please check that this question paper contains 7 questions. Please write down the Serial Number of the question before attempting it. 15 minute time has been allotted to read this question paper. The question paper will be distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the students will read the question paper only and will not write any answer on the answer-book during this period. INFORMATICS PRACTICES Time allowed : 3 hours Maximum Marks : 70 Instructions : (i) All questions are compulsory. (ii) Answer the questions after carefully reading the text. 1. 90 (a) A school with 20 stand-alone computers is considering networking them together and adding a server. State 2 advantages of doing this. 1 (b) Distinguish between LAN and WAN. 1 (c) What is the purpose of Modem in network ? 1 (d) Write one example of IP Address. 1 1 P.T.O. (e) Define Domain Name Resolution . 2 (f) Name two threats to security in a network. What is the role of Firewall in Network security ? 2 Write one advantage and one disadvantage of Open Source software over Proprietary software. 2 Write the value of variable c after execution of the following code : 1 (g) 2. (a) int d; int c; d=7; c = (5*++d)%3; (b) What is the difference between jTextField and jPasswordfield components ? 1 (c) In a SWITCH statement, what is the purpose of default section ? 1 (d) After typing the HTML code using a text editor, how do you see how it would look as a web page ? 1 Write Java code to assign the value 500 to variable x. Increase the value of x by 50 and store it in variable y. 2 Write the output that will be generated by the code given below : 2 (e) (f) int i; i = 7; int r; r=8; while (i<=10) { System.out.println(r*i); i = i+2; } (g) With XML there are no predefined tags Explain in brief with the help of an example. 90 2 2 3. (a) What is MySQL ? 1 (b) Is NULL value the same as 0 (zero) ? Write the reason for your answer. 1 (c) (d) (e) (f) (g) 4. (a) Write the UPDATE command to increase the commission (Column name : COMM) by 500 of all the Salesmen who have achieved Sales (Column name : SALES) more than 200000. The table s name is COMPANY. 1 While using SQL pattern matching, what is the difference between _ (underscore) and % wildcard symbols ? 1 How is Primary key constraint different from Unique key constraint ? 2 Write one similarity and one difference between CHAR and VARCHAR data types. 2 What is a Transaction ? Which command is used to make changes done by a Transaction permanent on a database ? 2 The following code has some error(s). Rewrite the correct code underlining all the corrections made. 2 int marks, temperature; marks = jTextField1.getText()); temperature = Integer.parseInt(jTextField2.getText()); if (marks < 80) and (temperature >= 40) { System.out.println("Not Good"); } else; { System.out.println("OK"); } 90 3 P.T.O. (b) How many times will the following WHILE loop execute ? 2 int y = 7, sum = 0; while (y<= 15) { sum = sum + y; y = y+2; } (c) Rewrite the following program code using IF ELSE IF instead of SWITCH statement : 2 String tour; int cl = Integer.parseInt(jTextField1.getText()); switch (cl) { case 8: tour = "\n You are going to Camp Ramgarh"; break; case 9: tour = "\n You are going to Manali, Rohtang Pass"; break; case 10: tour = "\n You are going to Chail"; break; default: tour = " No School tour for you this time"; } (d) Write the values of sum and x after execution of the following code : 2 int sum,x; sum = 7; x = 5; sum = sum + (x++); (e) What will be the contents of jTextField1 and jTextField2 after executing the following code : String s = "Best"; jTextField1.setText(s.length()+" "); jTextField2.setText(s.toUpperCase()); 90 4 2 (f) The students of Shiksha Vidyalaya work for different extra curricular activities like Community Outreach Programme , Swachh Bharat Abhiyan and Traffic Safety Club . The Programmer at the school has developed a GUI application as shown below : Outreach A student can participate in more than one activities. Each student gets 10 points for each activity namely Community Outreach Programme, Swachh Bharat Abhiyan and Traffic Safety Club. Help the programmer to write code for the following : (i) (ii) (iii) 90 When Calculate Total Score button is clicked, the points for each activity (that is selected) should be displayed in the text field in front of that activity s checkbox and the Total Score should be displayed in the appropriate Text field. 3 When Clear button is clicked, all the Textfields and Checkboxes should be cleared. 1 When Stop button is clicked, the application should close. 1 5 P.T.O. 5. (a) (b) Distinguish between Single Row and Aggregate functions of MySQL. Write one example of each. Consider the following table named SOFTDRINK . Write commands of SQL for (i) to (iv) and output for (v) to (vii). DRINKCODE Table : SOFTDRINK DNAME PRICE CALORIES 101 Lime and Lemon 20.00 120 102 Apple Drink 18.00 120 103 Nature Nectar 15.00 115 104 Green Mango 15.00 140 105 Aam Panna 20.00 135 106 Mango Juice Bahaar 12.00 150 (i) (iv) (v) To display names and drink codes of those drinks that have more than 120 calories. To display drink codes, names and calories of all drinks, in descending order of calories. To display names and price of drinks that have price in the range 12 to 18 (both 12 and 18 included). Increase the price of all drinks in the given table by 10%. SELECT COUNT(DISTINCT(PRICE)) FROM SOFTDRINK; (vi) SELECT MAX (CALORIES) FROM SOFTDRINK; 1 (vii) SELECT DNAME FROM SOFTDRINK WHERE DNAME LIKE %Mango% ; 1 (ii) (iii) 6. 1 1 1 1 1 (c) What is the degree and cardinality of SOFTDRINK TABLE ? 1 (a) Write MySQL command to create the Table LIBRARY with given constraints. 2 Table : LIBRARY COLUMN_NAME DATATYPE(SIZE) CONSTRAINT 90 2 BookId Int(10) Primary Key BookName Varchar(40) Not Null Type Char(4) Author Varchar(40) No_Copies Int(6) Price Decimal(8,2) 6 (b) In a Database Company, there are two tables given below : Table : SALES SALESMANID NAME SALES LOCATIONID S1 ANITA SINGH ARORA 250000 102 S2 Y.P. SINGH 1300000 101 S3 TINA JAISWAL 1400000 103 S4 GURDEEP SINGH 1250000 102 S5 SIMI FAIZAL 1450000 103 Table : LOCATION LOCATIONID LOCATIONNAME 101 Delhi 102 Mumbai 103 Kolkata 104 Chennai Write SQL queries for the following : (i) (ii) (iii) (iv) (v) 90 To display SalesmanID, names of salesmen, LocationID with corresponding location names. 2 To display names of salesmen, sales and corresponding location names who have achieved Sales more than 1300000. 2 To display names of those salesmen who have SINGH in their names. 2 Identify Primary key in the table SALES. Give reason for your choice. 1 Write SQL command to change the LocationID to 104 of the Salesman with ID as S3 in the table SALES . 1 7 P.T.O. 7. (a) How does e-learning allow students to study at their own pace ? 2 (b) How does e-governance empower citizens ? Write one point. 1 (c) Sabeena is creating a form for the hotel where she works. Help her to choose most appropriate controls from ListBox, ComboBox, TextField, TextArea, RadioButton, Checkbox, Label, Command Button for the following entries : 90 S.No. Function 1 To input name 2 To allow enter gender out of M or F 3 To allow selecting type of room out of Deluxe, SemiDeluxe, General 4 To allow entering preferences of guest in the form of a paragraph 8 and 2 61,500

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