MOCK PRE-BOARD EXAMINATION MARKING SCHEME ( ) CLASS XII INFORMATICS PRACTICES

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1 MOCK PRE-BOARD EXAMINATION MARKING SCHEME (07-8) CLASS XII INFORMATICS PRACTICES Time allowed :3hours Maximum marks : 70 Q. No. A. wer all parts of the same question together. B. Do your paper neatly. wer (a) Name any two proprietary software. MS Office, Oracle, Windows, Photoshop( any two) ( / mark for each correct software) (b) What was the objective behind developing UNICODE? UNICODE was developed with the objective to conceive a single standard code to represent most of the languages of the world. ( mark for correct objective) (c) State two advantages of networking. Resource Sharing, Cost Saving, Collaborative Computing, Time Saving/Sharing, Enhanced security or any other advantage ( / mark for each correct advantage) (d) Give an example of a domain name and a URL? URL - Domain name helpingeachother ( / mark for each correct identification) (e) Explain Ogg Vorbis. It is a new audio compression which is open format developed by Xiph.org. It is roughly comparable to mp3, mpeg- formats and is completely free, open and unpatented. Hence it imposes no restrictions on its usage, types of usage, distributions, redistribution etc. Marks (f) ( mark for correct definition) What is the name of the network topology in which terminators are placed at its ends? Give any advantages of this topology?

2 Bus topology. Advantages are Easy to connect a computer or peripheral to a linear bus i.e. easy to extend. Requires less cable length than a star topology. ( mark for identification and / mark for each correct advantage) (g) What is a Bridge? How is it different from a Gateway? Bridge connects two LANS having the same protocol Gateway : Gateway is a device that connects dissimilar networks. Establishes intelligent connection between a local network and external networks with completely different structures. Gateway is the ISP that connects the user to the internet. ( mark for each correct difference) (h) Mention at least two points of differences between freeware and Shareware. FREEWARE SHAREWARE Freeware refers to software that anyone can download from the Internet and use for free. All the features are free. Freeware programs can be distributed free of cost. Adobe PDF, Google Talk, yahoo messenger, MSN messenger,microsoft Internet Explorer and itunes Sharewares give users a chance to try the software before buying it. Most of the times, all features are not available, or have limited use. To use all the features of the software, user has to purchase the software. Shareware may or may not be distributed freely. In many cases, author s permission is needed, to distribute the shareware. Winzip, Cuteftp, Getright ( mark for correct definition and mark for correct explanation ) (i) Give two advantages and limitations of star topology? Central node dependency: In this topology central node is a controller of the network. If the central node fails, the entire network will be failed. ii) Difficult to expand: The addition of a new node to a network involves a connection all the way to the central node. ( mark each for correct limitation) (j) Write a note on Linux and Apache Server

3 LINUX it is free and open source software. It can be downloaded from Linux is a part of popular web server program LAMP (Linux, apache, MySql, PHP). Apache Server The most common web server (or HTTP server) software on the Internet. Apache is designed as a set of modules, enabling administrators to choose which Features theywish to use and making it easy to add features to meet specific needs including handlingprotocols other than the web-standard HTTP. Apache HTTP server is an open source web server.it is component of LAMP. ( mark for each correct definition) (a) Name the property which is used for setting the password character as $. Echochar ( mark for correct property) (b) Which tags are used for making a table and adding rows in a HTML document. <TABLE></TABLE> tags are used for making a table. <TR></TR> are used for adding rows in a HTML document. ( ½ mark for each correct tag/attribute) (c) Write Java code that takes the price of a pencil from jtextfield and quantity of pencils from jtextfield and calculates total amount as price * quantity to be displayed in jtextfield3.also find 0% tax amount to be displayed in jtextfield4. float Price = Float.parseFloat(jTextField.getText()); intqty=integer.parseint(jtextfield.gettext()); float Amt= Price* Qty; float Tax= Amt*0.; jtextfield3.settext(""+amt); jtextfield4.settext(""+tax); ( mark for correct output) (e) Give any features of HTML. Explain with an example how we can create our own tags in XML. HTML rules:. Tags are not case sensitive.. Attributes are also not case sensitive. 3. Attribute values are case sensitive. For example : 3

4 To store address, the tag <address> may be used as : < address > Punjabi Bagh</ address > ( ½ mark for each correct feature and mark for explanation through example) (f) Write a function in Java that takes principal, rate and time of float data type as parameters and returns Simple Interest. float SI(float p, float r, float t) { float ans = (p*r*t)/00; return ans; ( marks for correct output) (g) Write the output that will be generated by the code given below: for (inti=6; i>=; i=i-) jtextarea.append ( + Integer.toString (i*i*i) ); ( marks for correct output) 3 (a) Give the SQL command to view the structure of EMP table. Descemp; ( mark for correct command) (b) Is NULL same as 0(zero). Elaborate NULL means Unknown/No value/empty while 0 is a numeric value. ( mark for correct explanation) (c) Explain SAVEPOINT. The SAVEPOINT statement defines a marker in a transaction. These markers are useful in rolling back a transaction till the marker. SAVEPOINT Mark; ( mark for correct answer) (d) A table FOOD has 5 rows and 0 columns and table CUSTOMER has 0 rows and 0 columns. What is the cardinality and degree of the Cartesian product of the tables? Cardinality 50 Degree 0 (e) ( / mark for correct answer) A numeric column MONEY contains Give the SQL commands to truncate MONEY. 4

5 (i) Up to decimal places. (i.e. expected result ) (ii) Up to -3 places (i.e expected result 8000) (i) SELECT ROUND (MONEY,); (ii) SELECT ROUND(MONEY,-3); ( mark for each correct command) (f) What is the difference between CURDATE() and DATE() functions? CURDATE() Returns the current date in YYYY-MM-DD format or YYYYMMDD format, depending on whether the function is used in a string or numeric context. DATE(expr) extracts the date part of a date or datetime expression. ( mark each for correct definition) (g) A programmer has created a 5 digit password and stored in a string variable calledstrpassword. He wants to store the samepassword in an Integer type variable calledintpassword. Write an appropriate Java statement to transfer the content from strpasswordto intpassword. intpassword = Integer.parseInt(strPassword); ( mark for each correct assignment) 4 (a) What is IDE? A programming environment, where all the tools required for programming are available Under one roof is called IDE. ( mark for correct definition) (b) Write a statement to make jtextarea as un- editable. jtextarea.seteditable(false); ( mark for correct answer) (c) What will be displayed in jtextarea after executing the following statement : jtextarea.settext( TAFS\n is\t the best ); TAFS is the best ( mark for correct answer) (d) Define Object Oriented Programming and inheritance? OOP (Object Oriented Programming) CONCEPT The basic idea of OOP language is to combine data and the functions that operate on this data into a single unit. Such a unit is called object. An object represents an entity that can store data and has its interface through functions. The data of an object are data members and functions are called member functions in java. Reusability of code (inheritance) through which we can derive new classes from an older one in OOP. 5

6 (e) (f) ( mark for each correct definition) The following code has some error(s). Rewrite the correct code underlining all the corrections made. Int P=3;sum = 0; { Sum = P; P += 3; while (P=) jtextfield(integer.tostring(sum)); int P=3,sum=0; do { sum = P; P +=3; while(p= =); jtextfield.settext(integer.tostring(sum)); ( ½ mark each for correcting an error) What will be displayed in jtextfield jtextfield and jtextfield3after the execution of the following code? jtextfield.settext( + Math.round(-34.56)); jtextfield.settext( Math.pow(5,)); String st="happy New Year 08"; jtextfield.settext(""+st.substring(7)+st.length(); jtextfield3 will contain 89 ( marks for correct output) (g) Rewrite the following program code using if..else statement: String Remarks; int Code=Integer.parseInt(jTextField.getText()); switch (Code) { case 0: case : case :Remarks="30% Tax Exemption"; break; 6

7 case 3 : Remarks="50% Tax Exemption"; break ; default:remarks="!invalid Entry"; (h) int Code = Integer.parseInt(jTextField.getText()); if ((Code == 0) (Code == ) (Code == )) Remarks = "30% Tax Exemption"; else if(code ==3) Remarks = "30% Tax Exemption"; else Remarks = "! Invalid Entry"; ( marks for correct conversion) Pizza Cafe selling pizzas has computerized its billing. The following is the data entry screen used at their outlet. The outlet offers regular pizza at the rate of Rs400 per pizza and pan pizza at the rate of Rs 450 per pizza.. The user has a choice of three different types of extra toppings where Cheese extra topping costs Rs 60 and capsicum costs Rs 40. (i) Write the code to clear all textfields, select regular radio button. private void cmdclearactionperformed(java.awt.event.actioneventevt) { txtname.settext(""); txtqty.settext(""); txtrate.settext(""); txttop.settext(""); txtamount.settext(""); 7

8 optregular.setselected(true); (ii) Write the code to display the rate of a pizza based on the pizza type selected. private void cmdcalcrateactionperformed(java.awt.event.actioneventevt) { if (optregular.isselected()) txtrate.settext(string.valueof(400)); else if (optpan.isselected()) txtrate.settext(string.valueof(450)); (iii)write the code for AmountBTN to calculate the total amount and display it in AmountTF. The total amount should include the cost of extra toppings selected by the customer. 4 private void cmdcalcamtactionperformed(java.awt.event.actioneventevt) { int Top = 0; // Topping cost float Amt = 0; // Pizza amount // Finding topping cost if (chkcheese.isselected()) { Top +=60; if (chkcap.isselected()) { Top = Top + 40; txttop.settext(integer.tostring(top)); // Finding Pizza order amount Amt = (Integer.parseInt(txtRate.getText())+Top)*Integer.parseInt(txtQty.getText()); txtamount.settext(float.tostring(amt)); 5 (a) Differentiate between SQL and My SQL. SQL stands for Structured Query Language. It s a standard language for accessing and manipulating databases. MySQL is a Relational Database Management System (RDBMS), like SQL Server, Oracle, Informix, Postgres, etc. MySQL is a RDBMS. ( / mark for each correct example ) (b) What is the purpose of the following command 8

9 ALTER TABLE STUDENT ADD PRIMARY KEY ADMNO; To make admno as primary key in an existing table STUDENT. ( mark for correct answer) (c) Write output of the following SQL queries : (i) SELECT DAYOFMONTH( 00--); (ii) SELECT TRUNCATE(90,-); (iii) SELECT INSTR( Coordination, o ); (iv) SELECT CONCAT( India,NULL, Australia ); (i) (ii) 00 (iii) (iv) NULL ( / mark for each correct output) (d) Consider the following table FLIGHT given below. Write command of SQL for (i) to (iv) and output for (v) to (vi Table:FLIGHT FLCODE START DESTINATION STOPS PRICE IC0 MUMBAI DELHI 5000 IC0 SIKKIM MUMBAI 8000 IC03 SIKKIM DELHI IC05 CHENNAI KANPUR 8000 IC07 KANPUR MUMBAI IC43 CHENNAI INDORE IC KANPUR DELHI 6500 (i) Displaydetails ofallflights startingfrom MUMBAI and destination as Delhi. (ii) Display t h e detailsofflighs whose destination starts and ends with D and have no stoppage. (iii) Combine and display the first and last letters of the flight codes. (iv) (v) Display destinations along with flight codes of all whosestarting places beginswith J and ends with R SELECT count(distinct(stops)) FROM FLIGHT; 6 (vi) SELECT START, COUNT(*) FROM FLIGHT GROUP BY START; Select * from flight where start = mumbai and destination= delhi ; ( mark for correct command) 9

10 Select concat(left(flcode,),right(flcode,)) from flight; ( mark for correct command) Select flcode,start,destination from flight order by no_flight; ( mark for correct command) Select flcode,destination from flight where start like j%r ; ( mark for correct command) START COUNT(*) MUMBAI SIKKIM CHENNAI KANPUR count (DISTINCT(STOPS)) 4 ( mark for correct output) ( mark for correct output) 6 (a) Write MySQL commands to create a table SALESPERSON under database SOCIETY with the following specifications Table:SALESPERSON Field Type Size Constraint SCODE Integer 6 PrimaryKey FIRSTNAME Varchar 5 NotNull LASTNAME Varchar 5 NotNull CITY Varchar 30 Default delhi SALES Decimal 8, CREATE TABLE salesperson ( scode int(6) primary key, firstname varchar(5) not null, lastname varchar(5) not null, city varchar(30) default delhi, sales decimal(8,) ); ( mark for CREE TABLE) 0

11 (b) ( ½ mark for Column Names with Data Types) ( ½ mark for Constraints) wer the following based on the two tables in a database: Table: Employee ENO ENAME SALARY ZONE AGE GRADE DEPT Mona EAST 40 A 0 Muktar 7000 West 45 B 0 3 Nalini East 6 A 0 4 Sanaj South 30 A 0 5 Surya North 30 B 30 Table: Department DepCode DepName Budget Sales Personnel Accounts (i) (ii) (iii) (iv) (v) Name the primary and foreign key from the table Employee. Write SQL command to change the depname todeptname To display ENO, ENAME, SALARY and corresponding DNAME of all the employees whose age is between 5 and 35 To display DNAME and corresponding ENAME from the tables DEPARTMENT and EMPLOYEE. To display ENAME, SALARY, ZONE and INCOME TAX (Note: Income Tax to be calculated as 30% of salary) of all the employees with appropriate column headings. (i) Employee table primary key eno foreign key dept. (½ mark for each correct answer) (ii) Alter table department change depnamedeptnamechar(0); ( mark for correct query) Select ENO,ENAME,SALARY,DNAME from EMPLOYEE E, DEPARTMENT D where E.DEPT = D.DEPT and AGE between 5 and 35 ; ( marks for correct query) Select DNAME,ENAME

12 from EMPLOYEE E, DEPARTMENT D where D.HOD = E.ENO ; ( marks for correct query) ( marks for correct query) Select ENAME, SALARY, ZONE, SALARY * 0.3 INCOMETAX from EMPLOYEE ; ( marks for correct query)

Time Allowed :3 hours Maximum Marks : 70

Time Allowed :3 hours Maximum Marks : 70 Guru Harkrishan Public School Pre Mock Examination 2014-15 Class XII Sub: Informatics Practices General instructions : Please check that this question paper contains 5 printed pages. Please check that