Sample Questions for Practice CLASS XII

Answer the following Questions: (DO IT AS EARLY AS POSSIBLE )
Date :17/10/2013

( OLD CBSE Exam QUESTIONS )

1	Find the Output of the following Program What will be the value of A and B after the execution of the following code ? Int A=100, B; for (B=10;B<=12;B++) { A+=B; } JoptionPane.ShowMessageDialog(this, ”A:” +A + “ B :” +B “ “);
2	What will be content of the jTextArea1 after executing the following code (Assuming that JTextArea1 had no content before executing this code)?  for (int i =2;i<5;i++) { jTextArea1. SetText (JTextarea1.getText() + “ “ + Integer.toString(i*i)); }
3	What will be content of the jTextArea1 after executing the following code (Assuming that JTextArea1 had no content before executing this code)?  for (int c =1;c<=4;c++) { jTextArea1. SetText (JTextarea1.getText() + “ “ + Integer.toString(c*c)); }
4	What will be displayed in of jTextField1 after executing the following code ? Int N =20; N=N+1; If (N<21)     jTextField1.setText(Integer. toString (N+10)); else    jTextField1.setText(Integer. toString (N+10));
5	Rewrite the following code using a Switch statement if ( code == 1)       Day= “ Monday”; else if ( code == 2)       Day= “ Tuesday”; else if ( code == 3)       Day= “ Wednesday”; else if ( code == 4)       Day= “ Thursday”; else       Day=” No Match”;
6	The following code has some errors. Rewrite the correct code underlining all the correction made Int p=3; sum=0; { sum=p; P+=3; } while(p<=12)  jTextField1(Integer.tostring(sum));
7	The following code has some errors. Rewrite the correct code underlining all the correction made Int total=0,jump=5; Int I; for (i=0;i=<5;i++) { Jump +=5; Total+=jump; } jTextArea1.ShowText( “ “ +total);
8	What will be displayed in of jTextField1 after executing the following code? int m =16 m=m+1; If (m < 15)     jTextField1.setText(Integer. toString (m)); else    jTextField1.setText(Integer. toString (m+15));
9	Rewrite the following code using a Switch statement if ( code == 1)       Month= “ January”; else if ( code == 2)       Month= “ February”; else if ( code == 3)       Month= “March”; else if ( code == 4)       Month= “April”; else      Month= “No Match”;
10	The following code has some errors. Rewrite the correct code underlining all the correction made Int k=2; sum=0; { sum=k; k+=3; } while(k=<20)  jTextField1(Integer.tostring(sum));
11	The following code has some errors. Rewrite the correct code underlining all the correction made Int Sum=0,Step=5; Int I; for (i=0;i=<5;i++) { Step +=5; Sum +=Step; } jTextArea1.ShowText( “ “ +sum);
12	What will be the values of variables ‘m’ and ‘n’ after execution of the following code? int  m,n=0; for(m=1;m<=4;m++) { n+ = m; n--; }

Note: Read the question properly before finalizing the answer. Ignore case sensitive for finding the output

1	Find the Output of the following Program for( int i==12;i>5;i-2){ jTextArea1.append(String.valueof(i) +”\n”); }
2	Find the Output of the following Program int  i,sum; for( int i=10, sum=5;sum<15;i++) {sum+ =I; jTextArea1.append(“ Sum is :”+String.Value of(sum) + “\n”); }
3	Find the Output of the following Program int c=0,i=2; while (i<10){ c=++I –i*2; } jTextField1.setText(“c=”+String .Valueof(c)+”i=” +String.Valueof(i));
4	Find the Output of the following Program int i, j, a=10,b=8; for(i=0;i<=a;i++)   jTextField1.setText(String. Valueof(i); for(j=0;i<=a;j++)   jTextField1.setText(String. Valueof(++j); b=a; ++a; b++; jTextArea1.append(String.Value of(a) + “\n”+ String.Value of(b)+ “\n”); } jTextArea1.append(String.Value of(--b));
5	Find the Output of the following Program int  i, sum=0; I = 1; while(i<=10){ sum=sum + i; i+=3; } jTextField1.setText(“c=”+String .Valueof(sum));
6	How many times will the following loop gets executed x=5; y=36; while (x<=y) { x+=6; }
7	What will be the content of the jTextArea1 after executing the following code? int num=1; do { jTextArea1.setText(Interger.toString(++num)+”\n”); num=num+1; }While(num(<=10);
8	Find the Output of the following Program  int n; n=1; while (n<=31) { N=2*n; jTextArea.append(String.valueOf(n)+ “\n”); }
9	Find the Output of the following Program int x, y; x=5; y=1; while(x>0) { x=x-1; y=y*x; jTextArea1.append(String.valueOf(y) +”\n”);
10	Find the Output of the following Program int i =1; while (i<10){ jTextArea1.append(String.valueOf(i) +”\n”); i=i*2; }
11	Write an appropriate for loop for the situation described below;  A loop is to be repeated 200 times , except the loop is to be terminated if the value of the variables X become 175
12	How many times will the following loop gets executed a.  i=0; do { // statements }while (i>20);   b.  i=0; while (i>20) { // statements }
13	Find the Output of the following Program a.       for ( int i =10;i>6;i=i-2) jTextArea.append(String.valueOf(i) +”\n”); b.      int i=1; while (i<5) { jTextArea1.append(String.valueOf(i)); i=i*2; } c.       int total=0, sum=0,i; for ( int i =0;i<10;i++) sum+=I; jTextField1.setText(String.valueOf(total)); d.      for ( int j =0 ; j<=10 ;j++) jTextArea1.append(String.valueOf(++j));

Sample Questions

1	Which element are needed to control a Loop?
2	A list namely myList has SelectionMode property set to SINGLE-INTERVAL. How would you obtain (i) the indices of selected value?  (ii)  the selected value?
3	Find the output:                                                                                      I.    int f=1,i=2; do {       f*=i; } while(++I <5); System.out.println(f);
	II.   int j=1,s=0;                                                              while(j<10) {          System.out.print(j + “+”);          S=s+j;          J=j+j%3; }
4	a.                   Rewrite the code using While Loop?                                                      int i,j; for(i=1;i<=4;i++) {   for (j=1;j<=i;j++)     System.out.printl( “ “+j);               Sytem.out.println(); }
	b.                   Rewrite the code using While Loop?                                                      int i,j; for(i=1;i<=4;i++) {   for (j=1;j<=i;j++)     System.out.printl( “ “+j);               Sytem.out.println(); }
5	Write a program to take input of a variable and show the sum of all even numbers less than that given number input by the user.
6
7	Q.9 Paradise Park uses the following interface to generate bill for its customers. The controls used in the above interface are as follows: Control Type Control Name Functionality jTextField txtName Customer Name jTextField txtAge Customer Age jCheckBox chkJr1 Joy Ride 1 jcheckBox chjJr2 Joy Ride 2 jTextArea txtRes Bill Area jButon btnbill To generate Bill When the bill button is clicked the bill is displayed as shown in the interface above. The functionality is as follows: Rate for joy ride 1 is 100 and that for Joy ride 2 is 200. A customer can select one or both the joy rides. The total is calculated as the sum of one or both joy rides cost. A discount of Rs 50 is given on total if the child is below 12 years. Write code under the action event of the jButton to achieve the above functionality.
8	What will be the output of the following code segments: int a=5, b=10, c=9, d=8; System.out.println(“” + ((a++)+(++c)-(--b)+(d--)); System.out.println(“” + ((a>b)?(c>d)?(++d):35:(--b)));
9	Convert the following code segment using switch-case construct: int num = Integer.parseInt(txtNum.getText()); if(num>=2 && num<=5) txtRes.setText(“Prime”); else if(num==6 || num==8 || num==10) txtRes.setText(“Even”); else txtRes.setText(“Not Valid”);
10	Predict the output of the following java construct: int m=5; int prod=1; int i=1; while(i<=5) {    prod=prod+prod*(m%2);    --m;    ++i; } System.out.println(“”+prod);
11	What is the difference between an ordinary method and a Constructor?
12	What are the actual and formal parameters? Give example to support your answer.
13	Explain the use of Comments in Java with example.
14	Write a method in Java that takes a number as parameter and return sum of its divisors.
15	What will be the value of s after executing the following code?         double  i,sum=2           for(i=3;i<8;++i)             {    if(i%4= =0)                  {     break;                        sum=Math.pow(sum,i);                   }                  else                     sum+=i/2;              }
16	Haldwani Centre of Computer Mall wants to computerize its billing process. It offers 3 types of processor in the Notebook PC. Notebook PC comes with 2 GB RAM but if customer wants 4 GB RAM, he has to pay an additional Rs. 2000/-.   Company also offering 8% discount due to festive season. Processor Price i3 370M 4500 i5 430 M 6500 C2D 3500 a. Price of processor should be displayed in priceTF according to processor type selected by customer. b. NameTF can not accept numeric value. if user do so, he/she should get an error message.            c. On click of Clear button, all textfield will be clear and default choice of processor becomes i5 430M. d. Discount and Net price will be calculated on the click of Calc Price button as per the criteria given above.