ICSE computer applications 2013 board paper

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ICSE Paper – 2013
Class – X
Subject – Computer Applications             

 (Class: X)                                                                          (Two Hours)

Answer to this paper must be written on the paper provided separately.

This paper is divided into two sections.

Attempt ALL questions from Section A and any FOUR questions from Section B.

The intended marks for questions or parts of questions are given in brackets [ ].

SECTION A (40 Marks)

Attempt ALL questions.

Q1.a) What is meant by precedence of operators?                           [2x5=10]

      b) What is a literal?                                                                                                                      

      c) State the Java concept that is implemented through:                                        

             i)    a super class and a subclass.

             ii)   the act of representing essential features without including

                    background details.                                                 

      d) Give a difference between constructor and method.         

      e) What are the types of casting shown by the following examples?                                  

             i)    double x =15.2;

     int y =(int) x;

             ii)   int x =12;

                   long y = x;

Q2.a)  Name any two wrapper classes.                                         [2x5=10]

                   

      b) What is the difference between break and continue statements

when they occur in a loop.

      c) Write statements to show how finding the length of a character

           array and char[] differs from finding the length of a String object str.

                            

      d) Name the Java keyword that:                                                           

             (i)  indicates a method has no return type.

             (ii) stores the address of the currently calling object.  

                             

      e) What is an exception?                                                                                                                      

Q3.a) Write Java statement to create an object mp4 of class digital. [2x10=20]

                                      

 b) State the values stored in variables str1 and str2                                                                      

             String s1 = “good”; String s2=”world matters”;

       String str1 = s2.substring(5).replace(‘t’,’n’);

       String str2 = s1.concat(str1);

 c) What does a class encapsulate?

 d) Rewrite the following program segment using the if..else statement.                                          

           comm =(sale>15000)?sale*5/100:0;

 e) How many times will the following loop execute?

     What value will be returned?                                            

     int x = 2, y = 50;      

     do{

        ++x;

        y-=x++;

      }while(x<=10);   

     return y;

 f)  What is the data type that the following library functions return?                             

             i)  isWhitespace(char ch)

             ii) Math.random()

 g) Write a Java expression for ut + ½ ft²

 h) If int n[] ={1, 2, 3, 5, 7, 9, 13, 16} what are the values of x and y?    

x=Math.pow(n[4],n[2]);

y=Math.sqrt(n[5]+[7]);

 i)  What is the final value of ctr after the iteration process given below, executes?         

            int ctr=0;

      for(int i=1;i<=5;i++)

        for(int j=1;j<=5;j+=2)

          ++ctr;          

j)  Name the methods of Scanner class that:                             

              i)    is used to input an integer data from standard input stream.                                               

             ii)   is used to input a string data from standard input stream.

                         

SECTION B (60 Marks )

Attempt any four questions from this Section.

The answers in this section should consist of the program in Blue J environment with Java as the base. Each program should be written using Variable descriptions / Mnemonics Codes such that the logic of the program is clearly depicted.

Flow-charts and Algorithms are not required.

Q4. Define a class called FruitJuice with the following description:     [15]

          Instance variables/data members:

          int product_code    - stores the product code number

          String flavour        - stores the flavor of the juice.(orange, apple, etc)

          String pack_type    - stores the type of packaging (tetra-pack, bottle etc)

          int pack_size          - stores package size (200ml, 400ml etc)

          int product_price   - stores the price of the product

          Member Methods:

          FriuitJuice()           - default constructor to initialize integer data members

                                  to zero and string data members to “”.

          void input() - to input and store the product code, flavor, pack type,

                                            pack size and product price.        

          void discount()      - to reduce the product price by 10.

          void display()        - to display the product code, flavor, pack type,

                                            pack size and product price.        

              

Q5. The International Standard Book Number (ISBN) is a unique numeric book identifier which is printed on every book. The ISBN is based upon a 10-digit code. The ISBN is legal if:

1xdigit1 + 2xdigit2 + 3xdigit3 + 4xdigit4 + 5xdigit5 + 6xdigit6 + 7xdigit7 + 8xdigit8 + 9xdigit9 + 10xdigit10 is divisible by 11.

 

 Example: For an ISBN 1401601499

Sum=1x1 + 2x4 + 3x0 + 4x1 + 5x6 + 6x0 + 7x1 + 8x4 + 9x9 + 10x9 = 253 which is divisible by 11.

Write a program to:

(i) input the ISBN code as a 10-digit integer.

(ii) If the ISBN is not a 10-digit integer, output the message “Illegal ISBN” and terminate the program.

(iii) If the number is 10-digit, extract the digits of the number and compute the sum as explained above.

If the sum is divisible by 11, output the message, “Legal ISBN”. If the sum is not divisible by 11, output the message, “Illegal ISBN”.      [15]           

Q6. Write a program that encodes a word into Piglatin. To translate word into Piglatin word, convert the word into uppercase and then place the first vowel of the original word as the start of the new word along with the remaining alphabets. The alphabets present before the vowel being shifted towards the end followed by “AY”.

Sample Input(1): London        Sample Output(1):   ONDONLAY                           

Sample Input(2): Olympics     Sample Output(2):    OLYMPICSAY    [15]           

Q7. Write a program to input 10 integer elements in an array and sort them

 In descending order using bubble sort technique.         [15]           

Q8. Design a class to overload a function series() as follows:    [15]                      

(i) double series(double n) with one double argument and

     returns  the sum of the series.

     sum = 1/1 + 1/2 + 1/3 + ….. 1/n

(ii) double series(double a, double n) with two double arguments

      and returns  the sum of the series.

      sum = 1/a2 + 4/a5 + 7/a8 + 10/a11 ….. to n terms

           

Q9. Using the switch statement, write a menu driven program:     [15]                      

(i) To check and display whether a number input by the user is

     a composite number or not (A number is said to be a composite, if it

     has one or more then one factors excluding 1 and the number itself).

     Example: 4, 6, 8, 9…

(ii) To find the smallest digit of an integer that is input:

      Sample input:              6524

      Sample output:           Smallest digit is 2

For an incorrect choice, an appropriate error message should be displayed.

ICSE Computer Applications 2012 board paper

ICSE Java Complete Reference book is currently available as print on demand and can be bought from online stores. Please check the discounts offered by different websites. second edition of book (2013 release) includes 2013 board paper solution.

Good news!!

Discount is offered on 25+ copies. For more details write to info@pothi.com

ICSE Paper – 2012
Class – X
Subject – Computer Applications             

 (Class: X)                                                                          (Two Hours)

Answer to this paper must be written on the paper provided separately.

This paper is divided into two sections.

Attempt ALL questions from Section A and any FOUR questions from Section B.

The intended marks for questions or parts of questions are given in brackets [ ].

SECTION A (40 Marks)

Attempt ALL questions.

Q1.a) Give one example each of a primitive data type and a composite data type?        [2x5=10]

      b) Give one point of difference between unary and binary operators?                                    

      c) Differentiate between call by value or pass by value and call by reference

           or pass by reference.                                                                                         

      d) Write a Java expression for √(2as + u ²)

      e) Name the type of error (syntax, runtime or logical error) in each case given below?          

           i)    Division by a variable that contains a value of zero.

           ii)   Multiplication operator used when the operation should be division.

           iii)  Missing semi colon.

Q2.a)  Create a class with one integer instance variable. Initialize the variable using:     [2x5=10]

             i)    default constructor.

             ii)   parameterized constructor.

      b) Complete the code below to create an object of Scanner class.                            

          Scanner sc = --------- Scanner ( ------ );

      c) What is an array? Write a statement to declare an integer array of 10 elements.            

      d) Name the search or sort algorithm that:                                                               

           (i)  Makes several passes through the array, selecting the next smallest item in

                 the array each time and placing it where it belongs in the array.

           (ii)  At each stage, compares the sought key value with the key value of middle

                 element of the array.                       

      e) Differentiate between public and private modifiers for members of a class?                       

Q3.a) What are the values of x and y  when the following statements are executed?    [2x10=20]

int a = 63, b=36;

boolean x = (a > b) ? true : false

int y = (a < b) ? a : b

      b) State the values of n and ch?                                                                              

             char c = ‘A’;

             int  n = c + 1;

             char ch = (char) n;

      c) What will be the result stored in x after evaluating the following expression?            

            int x = 4; x+=(x++) + (++x) + x;

      d) Give the output of following program segment: sentence                                         

           double x = 2.9, y = 2.5; 

           System.out.println(Math.min(Math.floor(x),y));

           System.out.println(Math.min(Math.ceil(x),y));

      e) State the output of the following program segment                                                           

          String s = “Examination”;

            int n = s.length();                     

           System.out.println(s.startsWith(s.substring(5,n));

           System.out.println(s.charAt(2) == s.charAt(6));

      f)  State the method that.                                                                                          

            i)  Converts a string to a primitive float data type.

            ii)  Determines if the specified character is an uppercase character.

      g) State the data type and values of a and b after the following segment is executed. 

           String s1 = “Computer”, s2 = “Applications”                                  

           a = (s1.compareTo(s2))

           b = (s1.equals(s2))

      h) What will the following code output?                                                                        

             String s = “malayalam”

System.out.println(s.indexOf(‘m’));

System.out.println(s.lastIndexOf(‘m’));

      i)  Rewrite the following program segment using while instead of for statement           

            int f=1, i;

            for(i=1;i<=5;i++)

            {f*=i; System.out.println(f);)  

      j)  In the program given below, state the name and the value of the                               

i)    method argument or argument variable.

             ii)   class variable.

             iii)  local variable.

             iv)  instance variable.

            Class myClass
            {

              static int x = 7;

              int y = 2;

              public static void main (String args[])
              {

                myClass obj = new myClass();

                System.out.println(x);

                obj.sampleMethod(5);

                int a = 6;

                System.out.println(a);

              }

              void sampleMethod(int n)
             {

                System.out.println(n);

                System.out.println(y);

             }

          }

SECTION B (60 Marks )

Attempt any four questions from this Section.

The answers in this section should consist of the program in Blue J environment with Java as the base. Each program should be written using Variable descriptions / Mnemonics Codes such that the logic of the program is clearly depicted.

Flow-charts and Algorithms are not required.

Q4. Define a class called Library with the following description:                                     [15]

       Instance variables/data members:

          int acc_num        - stores the accession number of the book

          String title           - stores the title of the book

          String author       - stores the name of the author

       Member Methods:

          void input()         - to input and store the accession number, title and author.

          void compute()    - to accept the number of days late, calculate and display the fine

                                          charged at the rate of Rs 2 per day.        

          void display()      - to display the details in following format:.

          Accession Number          Title                 Author

          ------------------------                       -----                   ---------

        Write a main method to create an object of the class and call the above member

         methods.

           

Q5. Given below is a hypothetical table showing rates of income tax for the male

        Citizens below the age of 65 years:                                                    [15]                                                        

Taxable Income (TI) in Rs	Income Tax in Rs
Does not exceed Rs 1,60,000	NIL
Is greater than 1,60,000 and less than or equal to Rs 5,00,000	(TI - 1,60,000) X 10%
Is greater than 5,00,000 and less than or equal to Rs 8,00,000	[(TI - 5,00,000) X 20%]  + 34,000
Is greater than 8,00,000	[(TI - 8,00,000) X 30%]  + 94,000

Write a program to input the age, gender (male or female) and taxable income of a person.

If the age is more than 65 years or the gender is female, display “wrong category”. If the age is less than or equal to 65 years and the gender is male, compute and display the income tax payable as per the table given above.

Q6. Write a program to accept a string. Convert the string to uppercase Count and output the number of double letter sequences that exist in the string.

Sample Input: “SHE WAS FEEDING THE LITTLE RABBIT WITH AN APPLE”    

Sample Output: 4                                                                                             [15]

Q7. Design a class to overload a function polygon() as follows:                            [15] 

a)     void polygon (int n, char ch)    –  with one integer argument and one character type argument that draws a filled square of side n using the character stored in ch.                                 

b)     void polygon (int x, int y)    –  with two integer arguments that draws a filled rectangle of length x and breadth y, using the symbol ‘@’

c)     void polygon() – with no arguments that draws a filled triangle shown below.

Example:

             i)    Input value of n =2, ch = ‘O’.

                  Output:                               OO

                                                            OO      

             ii)   Input value of n =2, y = 5.

                  Output:                               @@@@@

                                                            @@@@@

             iii)   Output:                              *

                                                            * *

                                                            * * *

Q8. Using the switch statement, write a menu driven program to:                             [15]           

i)    Generate and display the first 10 terms of the Fibonacci series

      0, 1, 1, 2, 3, 5…..

The first two Fibonacci numbers are 0 and 1, and each subsequent number is the sum of the previous two.  

ii)    Find the sum of the digits of an integer that is input:

            Sample Input:   15390

            Sample Output: Sum of the digits = 18

    

       For an incorrect choice, an appropriate error message should be displayed.  

Q9. Write a program to accept the names of 10 cities in a single dimension string array and their STD (Subscribers Trunk Dialing) codes in another single dimension integer array. Search for a name of a city input by the user in the list. If found, display  “Search Successful” and print the name of the city along with its STD code, or else display the message “Search Unsuccessful, No such city in the list”.   [15]