CBSE Sample Paper Informatics Practices Class – 12th (2011) Set-1

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Sample Paper – 2011
Class – XII
Subject - Informatics Practices

Time : 3 hours                                           Max Marks:50

Q1. Answer the following questions.

     (a) Expand the following terms:         (i) ODF               (ii) GPL                                         2

     (b) A School would like to go in for network of all the computers. Which topology would you recommend and why?                               2

     (c) Differentiate between <P> and <Br>.                                                                          2

     (d) Write HTML code to set background image and change color of a document .                          2

     (e) Rewrite the following program code using for loop:                                                      2

             int i = 1, sum = 0;

              while (i < 10)

              { sum += i;

             i += 2;

                }

Q2. Answer the following questions:

(a) What is E R modelling? Identify the entities ,attributes and relationship in the following scenario:                                     2

           “A person can be Male or Female.”

(b) What is XML? How is it different from HTML?                                                  1

(c) Define the following terms.

                  (i) Multi –valued Attribute                     (ii) DDLC                                2

(d) Name MYSQL command to :                                                                              2

          1) display the structure of table

         2) change the widthe of a column

(e) What are column constraints ? Explain any two with example.                          2

Q3. Answer the following questions:

     (a) Which MySQL command helps you to see existing databases?                        1

    (b) What is an iterative statement ? Name any two iterative statements provided in JAVA.                      2

    (c) What is primary key? How is it different from candidate key? Explain with the help of suitable example.        2

    (d) Write the equivalent switch case for the following code :                                 3

           If (num1 = =1 )

           jTextField1.setText(“Number is one”);

           else If (num1 = =2 )

           jTextField1.setText(“Number is two”);

           else If (num1 = =3 )

           jTextField1.setText(“Number is three”);

           else

           jTextField1.setText(“Number is more than three”);

       (e) What are the use of the following tags- <UL>, <HEAD>, <SUP>, <P>                              2

Q4. Answer the following questions:

(a) What is Inheritance? Name the inheritance types which is not supported by Java.                        1

(b) What are the differences between hardware, software and firmware?                                            1

(c) What is Selection Statement? Describe each statement with syntax?                                              1

(d) Rewrite following while loop into a for loop                                                                    2

         int stripes =0;

         while(stripes<=13)

         if(stripes%2==2)

         {

         System.out.println(“colour code red”);

         }

         else

         {

         System.out.println(“colour code blue”);

         }

         System.out.println(“new stripe”);

         stripes =stripes +1;

         }

(e) The following code has some error(s). Rewrite the correct code underlining all the corrections made.                       2

       int y=3;

       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(“Invalid Number):

(f) What is mean by implicit and explicit type conversion ?                                                                1

(g) Write code to obtain list of selected items from a list namely List1.                                        1

(h) What are the actual and formal parameters of a method?                                                      1

Q5. Answer the following questions:

(a) The following code has some error(s). Rewrite the correct code underlining all the corrections made.              2

     int p, q =15;

     p= = q + 15;

     if (p= =q)

     { jTextField1.setText(“p and q are unequal”);

     jTextField2.setText(“they are not equal”); break;

     }

(b) Rewrite following for loop into a while loop                                                         2

      int sum=0;

      for(int i =1;i<=5;++i)

      {

      sum=sum+c;

      }

(c) Rewrite the following code using for loop.                                                     2

      int i=0;

      while(++i<20)

      { if( i==8)

      break;

      System.out.println(i++);

      }

(d) What will be the value of s after executing the following code?                                 2

        double i,sum=2

        for(i=3;i<8;++i)

        { if(i%4= =0)

        { break;

        sum=Math.pow(sum,i);

        }

        else

        sum+=i/2;

        }

(e) What is communication channel? What choices do you have while choosing a communication channel for a network?                              2



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