Half Yearly Examination SESSION: CLASS: Scholars 2 Subject :- Informatics Practices (ANSWER KEY) SECTION-A

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1 Code : 065 Subodh Public School Half Yearly Examination SESSION: CLASS: Scholars 2 Subject :- Informatics Practices (ANSWER KEY) SECTION-A Q 1. Answer the following questions:- (20 Marks) i. It is technology on computer networks whose purpose is to prevent unwanted networking connection according to some filtering/blocking rules. What is it? Ans : FIREWALL ii. Name the device that links two networks with different protocols GATEWAY iii. Name the type of network formed when you connect your computer to internet. WAN iv. Tisha says that the following numbers indicate an address: 20: AC : C2 : 56 : 3D :AB. What is the above address called? MAC Address v. Which of the following are open standards? (1) OGG (2).DOC (3).TTF (4). JPEG OGG and TTF are open standards vi. Differentiate between Open Source and Free Software. OPEN SOURCE FREE SOFTWARE open source software means the source code is made available, if source code is available we can copy it, modify it and distribute it. It freeware is software that has no cost at all, but it is provided without access to the source code. may or may not be free. vii. Given below are two addresses: (i) (ii) Identify which one of the above is an IP address and which one is a URL. (i) is an URL (ii) is an IP Address. viii. What is common in all of the following software(s)? (1Marks) Firefox, Perl, PHP, OpenOffice.org All are OSS ix. What do you understand by Network Security? (1Marks) Network security consists of the policies and practices adopted to prevent and monitor unauthorized access, misuse, modification, or denial of a computer network and network-accessible resources. x. How a domain name related to an IP Address. Domain name is a name given to website, these websites are stored on web server having a unique IP Address. We can also access website by its IP Address. A DNS server of ISP resolves domain name into its IP address. xi. Explain 2 measures that a school should take to ensure security of their computer network. Ans :- School should use following measures:- a. Make use of Firewall b. Make use of Licensed Antivirus c. Make use of proper login password. 1/10

2 xii. Write the purpose of the following devices : i. Network Interface Card ii. Repeater Ans :- A network interface card (NIC) is a circuit board that is installed in a computer so that it can be connected to a network. A repeater is a device that amplifies signals transmitted on the network. It is used to extend a network beyond the segment length of the wire used. xiii. How do Computer networks reduce hardware costs of an organization? Explain with the help of example. By sharing resources computer networks reduce hardware costs of an organization. For example by sharing printer, scanner, internet connection etc. xiv. Does open source software only mean that the software is free of cost? Give reason for your answer. No, Because OSS Programmer may demand money for services, helping in installation and troubleshooting. xv. After realizing the issues with proprietary software, Ms. Pratiksha has decided to use only Open Source Software. Suggest any one suitable open source software to her, for each of the following categories: (2Marks) a) Operating System b) Browser a. ) Operating System LINUX, ANDROID, GOOGLE CHROME OS etc. b.) Browser Mozilla Firefor, Google Chrome etc. Q 2. Answer the following questions on basis of JAVA :- (40 Marks) i. Name any two methods associated with joptionpane dialog. Ans: Any two of the following a. showmessagedialog b. showinputdialog c. showconfirmdialog ii. Mr. Naman is not able to understand the statement Java is a case sensitive language. Help him in understanding the above mentioned statement by giving suitable example. Ans :- Java is a case sensitive language. Case sensitive means lower and upper case letters are represented differently. For example "a" and "A" are two completely different things for Java. iii. Write a Java statement to Append a string ABC to the text that is already in the text area named jtextarea1. jtextarea1.append("abc"); iv. Identify programming language out of the following: HTML, C++, JAVA, MYSQL C++ and JAVA are programming languages. v. Write Java statement to extract selected item from a given listbox named jlist1. jlist1.getselectedvalue(); vi. Differentiate of its applications: iseditable() and isenabled(). : iseditable is a method used to check whether control is Editable or uneditable. For example if (jtextfield1.iseditable()) will be true if JTextfield is editable otherwise will be false. isenabled is a method used to check whether control is Enabled or disabled. For example if (jtextfield1.isenabled()) will be true if JTextfield is enabled otherwise will 2/10

3 be false. vii. viii. How do you differentiate the applications of: while and do while statements? WHILE DO..WHILE It is a Pre Tested/Entry control Loop It is a Post Tested/Exit control Loop May or may not execute depends on Will be executed at least once irrespective of condition. condition. In this condition is checked first then In this first statements are executed then statements executed. condition is checked. In a Java application using Net Beans IDE, the user views the data on the Text Fields, he found that his name is misspelled, now he wants to edit it, but can t. What was done by the programmer that does not allow the user to edit his name? Programmer must have made its enabled property false. ix. Which property of the radio button should be set to make the radio buttons mutually exclusive? ButtonGroup x. What will be displayed in jtextarea1 after the following code is executed: int i; for(i=10;i<50;i=i+30) { i=i+15; jtextarea1.append(""+i); jtextarea1.append("\n"+i); Content of jtextarea1 after executing above code is : xi. Observe the following code carefully and find which statement will never get executed in the code. int count=1; //Statement 1 do //Statement 2 { //Statement 3 if ( count<15 ) //Statement 4 jtextfield1.settext( Jump ); //Statement 5 else //Statement 6 jtextfield1.settext( Stop ); //Statement 7 count +=4; //Statement 8 //Statement 9 While (count<=15) ; //Statement 10 Statement6 and Statement7 will never be executed. xii. How many times will be the following loops execute? Which one of them is Entry control and which one is Exit Control? Loop1 Loop2 int n = 10, sum = 0; int n = 10, sum = 0; While (n <20) do { sum += n; { sum += n; 3/10

4 n + =3; n + =3; While (n <20); : Both loop will be executed 4 Times. Loop1 is an Entry Control Loop and Loop2 is an Exit Control Loop. xiii. What will be the content of jtextarea1 after executing the following code: Note: jtextarea1 is blank by default. for ( int n=3; n <= 5; n++) { jtextarea1.settext(jtextarea1.gettext( )+ + Integer.toString( n * n)); : Content of jtextarea1 after executing above code is : xiv What will be displayed in jtextfield1 and jtextfield2 after the following code is executed. int t; int x; x= 12 t =(3*x++)/3; jtextfield1.settext( + t); jtextfield2.settext( + x); : jtextfield1 12 jtextfield2 13 xv. Rewrite the following program code using If statement:- int c = jcombobox1.getselectedindex( ); switch ( c ) { case 0 : Amount = Bill; break; case 1 : Amount = 0.9 * Bill; break; case 2 : Amount = 0.8 * Bill; break; default : Amount = Bill; Switch into IF int c = jcombobox1.getselectedindex( ); if (c = =0) Amount = Bill; else if (c= =1) Amount = 0.9 * Bill; else if (c= =2) Amount = 0.8 * Bill; else Amount = Bill; xvi. The following code has error(s). Rewrite the correct code underlining all the corrections made : integer counter=0; for(num =i, num>=1; num ); { If i%num = 0 { counter = counter + 1; 4/10

5 Corrected Code is :- int counter=0; for(int num =i ; num>=1; num ) Remove Semicolon { If ( i%num = = 0 ) { counter = counter + 1; xvii. The following code has error(s). Rewrite the correct code underlining all the corrections made : switch(y); { case 1: System.out.print( Yes its One ); case>2: System.out.println( Yes its more than Two ); break; case else: System.out.print( InvalidNumber); Corrected Code is :- switch(y)remove Semicolon { case 1: System.out.print( Yes its One ); case 2: System.out.println( Yes its more than Two ); break; default: System.out.print( InvalidNumber ); Ending Quotes xviii. Write a equivalent while loop for the following code: int sz=25; for(int i=0,sum=0;i<sz;i++) sum+=i; System.out.println(sum); Ans : After converting to While from For. int sz=25; int i=0, sum=0; while (i<sz) { sum+=i; i++; System.out.println(sum); Xix Rewrite the following if segment using switch-case statement. char ch='a'; if(ch= ='A') System.out.println("Account"); if((ch= ='C') (ch= ='G')) System.out.println("Admin"); if(ch= ='F') System.out.println("Advisor"); After converting from IF to Switch :- 5/10

char ch='a'; Switch (ch ) { case 'A' : System.out.println("Account"); case 'C' : case 'G' : System.out.println("Admin"); case 'F' : System.out.println("Advisor"); Xx Rewrite the following code using for loop: int i = 0; while(++i<20) { if(i = = 8) break; System.

6 char ch='a'; Switch (ch ) { case 'A' : System.out.println("Account"); case 'C' : case 'G' : System.out.println("Admin"); case 'F' : System.out.println("Advisor"); Xx Rewrite the following code using for loop: int i = 0; while(++i<20) { if(i = = 8) break; System.out.println(++i); Ans : after converting from while to for:- int i = 0; for( ; ++i<20; ) { if(i = = 8) break; System.out.println(++i); xxi. Mr. Rounak works as a programmer in Universal Technologies Pvt. Ltd.. He has designed a Library software to generate the member ship fee depending upon the membership type considering discount eligibility as well. A screenshot of the same is shown below: 6/10

7 Help him in writing the code to do the following: a. After selecting appropriate Radio Button, when Check Fee button is clicked, fee should be displayed in the respective text field according to the following criteria: (3 Marks) Membership Type Fee Monthly 500 Quarterly 1000 Yearly 1500 Ans :- private void jbutton1actionperformed(java.awt.event.actionevent evt) { if (jradiobutton1.isselected( ) ) jtextfield3.settext( 500 ); else if (jradiobutton2.isselected( ) ) jtextfield3.settext( 1000 ); else if (jradiobutton3.isselected( ) ) jtextfield3.settext( 1500 ); b. After selecting appropriate Radio Button, when Check Discount button is clicked, appropriate discount should be displayed in the respective text field according to the following criteria: Discount Eligibility Discount Students 200 Other 100 Ans : private void jbutton2actionperformed(java.awt.event.actionevent evt) { if (jradiobutton4.isselected( ) ) jtextfield4.settext( 200 ); else if (jradiobutton5.isselected( ) ) jtextfield4.settext( 100 ); c. When Calculate button is clicked, Net Fee should be calculated and displayed in the respective text field as per the given formula: Net Fee = Fee Discount private void jbutton1actionperformed(java.awt.event.actionevent evt) { int fee = Integer.ParseInt(jTextField3.getText( )); int d = Integer.ParseInt(jTextField4.getText( )); int net = fee -d; jtextfield5.settext(net+ ); XXII. Mr. Kushagra works as a programmer in ABC Car Rental Company, where he has designed a software to compute charges to be paid by the client. A screenshot of the same is shown below: 7/10

A client can take any car out of deluxe/semi deluxe/ordinary for rent. A client can also opt for services of a guide. Charges vary depending on the type of car opted.

8 A client can take any car out of deluxe/semi deluxe/ordinary for rent. A client can also opt for services of a guide. Charges vary depending on the type of car opted. Charges of services of Guide are extra. Help Mr. Kushagra in writing the code to do the following:- a. After selecting appropriated Radio Button and Checkbox (if required), when CALCULATE button is clicked, Amount, Guide Charges and Total amount should be calculated and displayed in the respective text fields. (3 Marks) Category of Car Amount(in Rs.) Deluxe Car 1000 per day Semi Deluxe Car 800 per day Ordinary Car 700 per day Amount is obtained by multiplying per day charges of car with number of days for which the car is taken. If Guide Required checkbox is selected, Guide charges per day are Rs Guide charges is calculated as : Car required for No. Of DAYS * 500; Total Amount = Amount + Guide Charges. private void jbutton1actionperformed(java.awt.event.actionevent evt) { int NoDays = Integer.ParseInt(jTextField3.getText( )); int perday= 0; if (jradiobutton1.isselected( ) ) perday = 1000; else if (jradiobutton2.isselected( ) ) perday = 800; else if (jradiobutton3.isselected( ) ) perday = 700; int carcharges = NoDays* perday; int guidecharges= 0; if (jcheckbox1.isselected( ) ) guidecharges = 500*NoDays; int amt = guidecharges+ carcharges; jtextfield4.settext(carcharges+ ); jtextfield5.settext(guidecharges+ ); jtextfield6.settext(amt+ ); b. When CLEAR button is clicked, all the textfields and checkboxes should be cleared. 8/10

9 : private void jbutton2actionperformed(java.awt.event.actionevent evt) { jtextfield1.settext( ); jtextfield2.settext( ); jtextfield3.settext( ); jtextfield4.settext( ); jtextfield5.settext( ); jtextfield6.settext( ); jcheckbox1.setselected(false); c. When CLOSE button is clicked, the application should close. private void jbutton2actionperformed(java.awt.event.actionevent evt) { System.exit( 0 ); Q 3. Answer the following questions on basis of IT-Applications:- (10 Marks) i. How does Digital-India campaign contributed to e-goverence? Digital India is a campaign launched by the Government of India to ensure the Government's services are made available to citizens electronically. By digitization all citizen could excess all government related information online, that s why it is contributing towards e- governance. ii. Write down the social and economic benefits of ICT. Social and Economic benefits of ICT: Social networking sites help people remain in touch with their nears and dears even when they are staying on opposite sides of the globe. Social networking sites help like-minded people come together and work for some cause. e-governance sites help people save their productive time by performing various government related jobs like getting some forms, depositing bills online. ICT helps economy grow at a faster rate as it provides transparency in the processes and helps the government to keep check on defaulters. Due to e-banking and use of plastic money more money is put in circulation leading to faster growth of GDP. iii. How do online retailers usually offer customers a wider range of products at prices that are lesser than those of traditional stores? Ans : As online retailers are directly purchase from supplier in bulk so they are providing at lower cost to customers. Whereas in case of traditional stores, intermediate margin of Distributors, C & F is involved that is why it is at higher cost. iv. List two disadvantages of e-governance to a disabled person. a. No personal touch/emotions b. Disabled person find it difficult to manage online information. v. How does E-business help organizations to provide better customer services? By taking feedback in regard to product supplied, E-business provide better customer services. 9/10

10 Any other valid answer is also acceptable. vi. Mr Sushil working as Manager in Facebook wants to create a form in Netbeans to take various inputs from user. Help him to choose most appropriate controls from Label, List Box, Combo Box, TextField, TextArea, Radio Button, Check Box, Label and Command Button for the following entries from user. a) To Enter Salary b) Select Gender (M / F) c) Select Department from available List d) Choose Hobbies ( Singing/ Dancing/Painting/Sculpture ) a. TEXTFIELD/TEXTAREA b. RADIO BUTTON c. COMBOBOX d. CHECKBOX vii. Mr. Lakshya working as a Planning Manager in High Tech. He wants to create the forms with the following functions. Choose appropriate controls from Text Field, Label, Radio Button, Check Box, List Box, Combo Box, Button, Text Area. a) Enter Address b) Display total amount of bill c) Display the list of Items to be selected d) Submit Form. a. TEXTFIELD/TEXTAREA b. TEXTFIELD/TEXTAREA c. LISTBOX d. BUTTON 10/10

MONTHLY TEST (JUNE 2018) CLASS XII INFORMATICS PRACTICES

M.M: 40 MONTHLY TEST (JUNE 2018) CLASS XII INFORMATICS PRACTICES TIME: 80 Mins. Q1. Which of the following is not a feature of Networking? (i) Resource Sharing (ii) Reliability (iii) Uninterrupted power