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CBSE Class 11 Pre Board 2019 : Informatics Practices (St Xavier's Sr. Sec. School, Delhi)

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Std. 11 16-2-2019 Annual Examination in INFORMATICS PRACTICE 1. Write any two differences between each of the following :a) b) c) d) e) f) g) Time : 3 hrs. Max. Marks : 70 [14] setText() and append() Sequential construst and Selective Construct System.out.print() and System.out.println() ? : and if..else statement jRadioButton and jCheckBox controls switch case and Multiple if else Operator = and Operator == 2. a) What happens if break is not written in switch..case statement? What name is given to this concept? [2] b) What is the significance of default statement is switch..case? Will the program generate error if default is not written in switch..case? [2] c) What is ternary operator? Explain with example. [2] d) Write the datatype name for the following values: [2] i) H ii) K iii) 89.67 iv) -45 e) Which control is used to group the jRadioButtons? Draw its icon. [2] f) What values can be stored in Boolean datatype? [1] 3. Write output of the following:a) int A=200 , B=250; String S1= INFORMATICS ; System.out.println( +A+B); System.out.println(S1.charAt(0)); System.out.println(S1.charAt(5)); System.out.println( +(A+B)); [4] b) switch( house ) { case T : jTextArea1.append( Tagore-Yellow ); case G : jTextArea1.append( Gandhi-Green ); case B : jTextArea1.append( Bhabha-Blue ); break; case N : jTextArea1.append( Nehru-Red ); default : jTextArea1.append( Not a valid House ); } What will be the output if the value of variable house is : i) N ii) G iii) B iv) H [6] c) int G = Integer.parseInt( jTextField1.getText() ); if ( G >=75 ) { if ( G >= 95 ) System.out.println( Excellent ); } else System.out.println( Can do better ); [3] if the input given for jTextField1 is : i) 82 ii) 98 iii) 61 4. Convert the following:a) if .. else to switch .. case String s1=jTextField1.getText(); char grade= s1.charAt(0); if (grade == 'A') jTextField1.setText( "Excellent" ); else if (grade == 'B') jTextField1.setText( "Better luck next time!" ); Std. 11 -2- [3] INFORMATICS PRACTICE else if (grade == 'C') jTextField1.setText( "Hard Luck" ); else jTextField1.setText( "Consider switching major..." ); b) Conditional operator to if .. else String s= jTextField1.getText(); int D = Integer.parseInt(s); jLabel1.setText( + ( D%4==0 ? "Divisible by 4" : "Not Divisible" )); 6. Find errors in the following programs :a) float N1 = Float.parse( jTextField1.getText() ); SWITCH( N1 ) { case 1 : System.out.println ( @@@ ); case 5.2 : System.out.println ( ### ); case 1 : System.out.println ( %%% ); case 7 : System.out.println ( &&& ); Default : jTextArea1.Append( invalid ); } b) Int i, j=5; i==j+5; if(i=j) ; { jTextField1.setText( i and j are unequal ); jTextField2.setText( they are not equal ); } else jTextField1.setText( i and j are equal ) [2] [3] brake; [2] 7. Design the frame and write coding for :a) jButton1 to join the messages written in jTextField1 and jTextField2 and display the result in jTextField3 [2] b) jButton2 to clear the jTextField1 and jTextField2 [1] c) jButton3 to exit the jFrame [1] 8. Design the frame and add the values typed in jTextField1, jTextField2 and jTextField3 and display the result in jTextArea1 [3] Std. 11 -3- INFORMATICS PRACTICE 9. Calculate DA, HRA, Gross, Tax, Net-Salary, Annual-Salary and Monthly-Tax and store the result in respective jTextFields based on the salary inputted in jTextField2 [5] Da = 50% of Salary Hra = 30% of Salary Gross = Salary + Da+ Hra Annual Salary = Gross * 12 Total Tax = Monthly_Tax * 12 Monthly Tax = 10% of Net_Salary Net_ Salary = Gross tax 10. Write coding to print the month name by checking the month number from the user in jTextField1 ( 1 for JANUARY, 2 for FEBUARY So on up to the month of JUNE only). Print message in a dialog box. ( using Multiple if else..) [4] 11. Write coding to calculate discount from the cost entered in jTextField1 using conditional operator ( ?:). If total cost is greater than 5000 discount given is 20% otherwise the discount given is 10% on cost of cloth. [3] 12. Write the coding for jButton to check the greater number of two numbers entered in jTextField1 and jTextField2 print the greater in jLabel3. [3] -X-X-X-X-X-X-

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