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ICSE 2012 : COMPUTER APPLICATIONS

6 pages, 33 questions, 33 questions with responses, 103 total responses,    0    0
Rudrajit
The Future Foundation School (TFFS), Kolkata
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COMPUTER APPLICATIONS (Theory) (Two hours) Answers to this Paper must be written on the paper provided separately. You will not be allowed to write during the first 15 minutes. This time is to be spent in reading the question paper. The time given at the head of this Paper is the time allowed for writing the answers. 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 Question 1. (a) Give one example each of a primitive data type and a composite data type. [2] (b) Give one point of difference between unary and binary operators. [2] (c) Differentiate between call by value or pass by value and call by reference or pass by reference. [2] (d) Write a Java expression for 2 [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 semicolon. [2] Question 2. (a) Create a class with one integer instance variable. Initialize the variable using: (i) default constructor. (ii) parameterized constructor. T12 861 This Paper consists of 6 printed pages. www.javaforschool.com [2] Turn over (b) Complete the code below to create an object of Scanner class: Scanner sc = ______ Scanner ( _____________ ); [2] (c) What is an array? Write a statement to declare an integer array of 10 elements. [2] (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. At each stage, compares the sought key value with the key value of the middle element of the array. [2] Differentiate between public and private modifiers for members of a class. [2] (ii) (e) Question 3. (a) What are the values of x and y when the following statements are executed? int a=63, b=36; boolean x = (a>b) ? true : false ; int y = (a<b) ? a : b; (b) [2] State the values of n and ch. char c = A ; int n = c+1; char ch = (char)n; (c) [2] What will be the result stored in x after evaluating the following expression? int x = 4; x+= (x++)+(++x)+x; (d) [2] Give output of the following program segment: double x= 2.9 , y=2.5; System.out.println(Math.min(Math.floor(x),y)); System.out.println(Math.max(Math.ceil(x),y)); (e) [2] 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)); [2] 2 T12 861 www.javaforschool.com (f) State the method that: (i) (ii) (g) Converts a string to a primitive float data type Determines if the specified character is an upper case character. 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) [2] 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) [2] What will the following code output: String s= malayalam ; System.out.println(s.indexOf( m )); System.out.println(s.lastIndexOf( m )); (i) [2] [2] In the program given below, state the name and the value of the: (i) (ii) (iii) (iv) method argument or argument variable class variable local variable 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); } T12 861 3 www.javaforschool.com Turn over void sampleMethod(int n){ System.out.println(n); System.out.println(y); } } [2] SECTION B (60 Marks) Attempt any four questions from this Section. The answers in this Section should consist of the Programs in either Blue J environment or any program environment with Java as the base. Each program should be written using Variable descriptions/Mnemonic Codes such that the logic of the program is clearly depicted. Flow-Charts and Algorithms are not required. Question 4. Define a class called Library with the following description: 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: (i) void input() To input and store the accession number, title and author. (ii) void compute() To accept the number of days late, calculate and display the fine charged at the rate of ` 2 per day. (iii) void display() To display the details in the following format: Accession Number Title Author Write a main method to create an object of the class and call the above member methods. [15] 4 T12 861 www.javaforschool.com Question 5. Given below is a hypothetical table showing rates of income tax for male citizens below the age of 65 years: Taxable Income (TI) in ` Income Tax in ` Does not exceed ` 1,60,000 Nil Is greater than ` 1,60,000 & less than or equal to (TI 1,60,000) x 10% ` 5,00,000 Is greater than ` 5,00,000 & less than or equal to ` 8,00,000 Is greater than ` 8,00,000 [(TI 5,00,000) x 20%] + 34,000 [(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. [15] Question 6. 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] Question 7. Design a class to overload a function polygon() as follows: (i) 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. (ii) void polygon(int x, int y) with two integer arguments that draws a filled rectangle of length x and breadth y, using the symbol @ T12 861 5 www.javaforschool.com Turn over (iii) void polygon() with no argument that draws a filled triangle shown below. Example: (i) Input value of n = 2, ch= O Output: OO OO (ii) Input value of x = 2, y = 5 Output: @@@@@ @@@@@ (iii) Output: * ** *** [15] Question 8. Using the switch statement, write a menu driven program to: (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: Sample Output: 15390 Sum of the digits = 18 For an incorrect choice, appropriate error message should be displayed. [15] Question 9. 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] 6 T12 861 www.javaforschool.com

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