ICSE Class 10 Computer Applications — 2024 Specimen

relational

Reason — Relational expressions are constructed using relational operators — equal to ( == ), not equal to ( != ), less than ( < ), less than equal to ( <= ), greater than ( > ), greater than equal to ( >= )

conditional operator

Reason — Ternary operator is a conditional operator as it evaluates the given condition. Its syntax is as follows:

condition? expression 1 : expression 2

If the condition is true then result of ternary operator is the value of expression 1. Otherwise the result is the value of expression 2.

Boxing

Reason — Boxing is the conversion of primitive data type into an object of its corresponding wrapper class.

20 bytes

Reason — A char data type occupies '2' bytes in the memory. Thus, 10 char type elements occupy (10 x 2) = 20 bytes in memory.

nextDouble()

Reason — The nextDouble() function reads the next token entered by the user as a double value.

case

Reason — case is a keyword. It is used to define switch case construct.

11.0

Reason — The given expression is evaluated as follows:
Math.round(6.6) + Math.ceil(3.4)
⇒ 7 + 4.0
⇒ 11.0

Math.round() rounds off its argument to the nearest mathematical integer and returns its value as an int or long type. Math.ceil method returns the smallest double value that is greater than or equal to the argument and is equal to a mathematical integer. In the addition operation, the type of result is promoted to a double as one operand is double. Hence, the result is 11.0.

syntax

Reason — The given statement is missing a terminator ( ; ) at the end. Thus, it has a syntax error.

X[4]

Reason — Array indexes start from 0. So, X[4] refers to the 5th element of the array.

able

Reason — "Remarkable".substring(6) will extract a substring starting from the character at index 6 (i.e., 7^th character of the string) which is 'a' till the end of the string. Hence the output is able.

Character

Reason — Character is the wrapper class for the data type char.

java.lang

Reason — Wrapper classes are present in java.lang package.

Polymorphism

Reason — In object-oriented programming, Polymorphism provides the means to perform a single action in multiple different ways and constructor overloading follows Polymorphism principle of Object Oriented programming wherein a constructor having the same name behaves differently with different arguments.

Only i

Reason — Integer constants represent whole number values only. Thus, 4 is an integer constant. 4.0 is a double constant, 4.3f is a float constant while "four" is a String constant.

0

Reason — compareTo() method compares two strings lexicographically and returns the difference between the ASCII values of the first differing characters in the strings. Here, the strings are equal so the difference is 0.

Assertion (A) is false and Reason (R) is true

Reason — In Java, statements written in lower case letter or upper case letter are treated differently as Java is a case sensitive language.

Data members and Member methods

Reason — A class encapsulates state and behavior by combining data and functions into a single unit. The state of an object is represented by its member variables and behaviour is represented by member methods.

Both Assertion (A) and Reason (R) are true and Reason (R) is a correct explanation of Assertion (A)

Reason — Call by value is known as pure method as it does not modify the value of original variables. The original value of variable does not change as operation is performed on copied values.

1

Reason — In Java, the Character.toLowerCase(char ch) method is used to convert a given character to its lowercase equivalent, if one exists. If the character is already in lowercase or there is no lowercase equivalent, it will return the original character.

Math.pow((p + q) , 2)

10

Initially, x = 2. The expression is calculated as follows:

x = x++ + ++x + x
x = 2 + ++x + x          (x = 3)
x = 2 + 4 + x               (x = 4)
x = 2 + 4 + 4               (x = 4)
x = 10

The corrected code is as follows:

boolean dh = true; 
boolean cr= true; 
if (dh && cr)
System.out.println("You can go out"); 
else
System.out.println("You cannot go out");	

1. boolean dh = True; — Here, True should be in lowercase as true.
2. println statements of if-else should be interchanged because if both dh (done homework) and cr (cleaned room) are true then the person can go out.

Logical error.

Modified program:

void triangle(double b, double h)
{	
    double a; 
    a = 1.0/2 * b * h;
    System.out.println("Area=" + a);	
}	

The statement is evaluated as follows:

a = 1/2 * b * h;
a = 0 * b * h; (1/2 being integer division gives the result as 0)
a = 0 (Since anything multiplied by 0 will be 0)

To avoid this error, we can replace '1/2' with '1.0/2'. Now the expression will be evaluated as follows:

a = 1.0/2 * b * h;
a = 0.5 * b * h; (The floating-point division will result in result as as 0.5)

This will give the correct result for the given code.

The loop will execute 5 times and the value returned is 15.

(a)

3

indexOf() returns the index of the first occurrence of the specified character within the string or -1 if the character is not present. First occurrence of 'I' in "ARTIFICIAL" is at index 3 (a string begins at index 0).

(b)

13

trim() removes all leading and trailing space from the string and length() returns the length of the string i.e., the number of characters present in the string. Thus, the output is 13.

Two jump statements are:

1. break statement
2. continue statement

20*23

Integer.parseInt() method will convert the strings a and b to their corresponding numerical integers — 20 and 23. In the statement, System.out.print(a + "*" + b); a, b, and "*" are strings so + operator concatenates them and prints 20*23 as the output.

(a) 0

(b) null

int R[ ] = {12, 14, 16, 18, 20, 22, 24};

(a) Size of array P[ ] = 4
     Size of array Q[ ] = 3
     Size of array R[ ] = 7 (4 + 3).

(b) Index position of first element is 0.
     Index position of last element is 6.

import java.util.Scanner;
public class Eshop
{
    private String name;
    private double price;
    private double disc;
    private double amount;

    public void accept() {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter item name: ");
        name = in.nextLine();
        System.out.print("Enter price of item: ");
        price = in.nextDouble();
    }
    
    public void calculate() {
        double d = 0.0;
        
        if (price < 1000)
            d = 0.0;
        else if (price <= 25000)
            d = 5.0;
        else if (price <= 57000)
            d = 7.5;
        else if (price <= 100000)
            d = 10.0;
        else
            d = 15.0;
        
        disc = price * d / 100.0;
        amount = price - disc;
        
    }
    
    public void display() {
        System.out.println("Item Name: " + name);
        System.out.println("Net Amount: " + amount);
    }
    
    public static void main(String args[]) {
        Eshop obj = new Eshop();
        obj.accept();
        obj.calculate();
        obj.display();
    }
}

import java.util.Scanner;

public class KboatSelectionSort
{
    public static void main(String args[]) 
    {
        Scanner in = new Scanner(System.in);
        int arr[] = new int[10];
        System.out.println("Enter 10 integers: ");
        for (int i = 0; i < 10; i++) 
        {
            arr[i] = in.nextInt();
        }
        
        for (int i = 0; i < 9; i++) 
        {
            int idx = i;
            for (int j = i + 1; j < 10; j++) 
            {
                if (arr[j] < arr[idx])
                    idx = j;
            }
            
            int t = arr[i];
            arr[i] = arr[idx];
            arr[idx] = t; 
        }
        
        System.out.println("Sorted Array:");
        for (int i = 0; i < 10; i++) 
        {
            System.out.print(arr[i] + " ");
        }
    }
}

import java.util.Scanner;

public class KboatCountVowels
{
    public static void main(String args[]) 
    {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter the string: ");
        String str = in.nextLine();
        str = str.toUpperCase();
        str += " ";
        int count = 0;
        int len = str.length();
        
        for (int i = 0; i < len - 1; i++) 
        {
            char ch = str.charAt(i);
            if(ch == 'A' 
                || ch == 'E' 
                || ch == 'I'
                || ch == 'O'
                || ch == 'U')
                count++;
        }
        
        System.out.println("String : " + str);
        System.out.println("Number of vowels : " + count);
    }
}

import java.util.Scanner;

public class KboatDDASpArr
{
    public static void main(String args[]) 
    {
        Scanner in = new Scanner(System.in);
        int arr[][] = new int[3][3];
        long evenSum = 0, oddSum = 0;
        System.out.println("Enter the elements of 3 x 3 DDA: ");
        for (int i = 0; i < 3; i++) {
            for (int j = 0; j < 3; j++) {
                arr[i][j] = in.nextInt();
            }
        }
        
        for (int i = 0; i < 3; i++) {
            for (int j = 0; j < 3; j++) {
                if (arr[i][j] % 2 == 0)
                    evenSum += arr[i][j];
                else
                    oddSum += arr[i][j];
            }
        }
        
        System.out.println("Sum of even elements = " + evenSum);
        System.out.println("Sum of odd elements = " + oddSum);
        if (evenSum == oddSum)
            System.out.println("Special Array");
        else
            System.out.println("Not a Special Array");
    }
}

import java.util.Scanner;

public class KboatDuckNumber
{
    public static void main(String args[]) 
    {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter a number: ");
        int num = in.nextInt();
        int n = num;
        int count = 0;
        
        while (n != 0)    {
            count++;
            n = n / 10;
        }
        
        if (count == 3)
        {
            n = num;
            boolean isDuck = false;
            while(n != 0) 
            {
                if(n % 10 == 0)  
                {  
                    isDuck = true;
                    break;
                }
                n = n / 10;  
            }
            
            if (isDuck) {
                System.out.println("Duck Number");
            }
            else {
                System.out.println("Not a Duck Number");
            }
        }
        else {
            System.out.println("Invalid");
        }
    }
}

1
1 2
1 2 3
1 2 3 4
1 2 3 4 5

void display(int n): To print the square root of each digit of the given number.

Example:
n = 4329
Output – 3.0
1.414213562
1.732050808
2.0

import java.util.Scanner;

public class KboatMethodOverload
{
    public void display()
    {
        for(int i = 1; i <= 5; i++) 
        {
            for(int j = 1; j <= i; j++)
            {
                System.out.print(j + " ");
            }
            System.out.println();
        }
    }
    
    public void display(int n)
    {
        while( n != 0)
        {
            int d = n % 10;
            System.out.println(Math.sqrt(d));
            n = n / 10;
        }
    }
    
    public static void main(String args[]) 
    {
        KboatMethodOverload obj = new KboatMethodOverload();
        Scanner in = new Scanner(System.in);
        
        System.out.println("Pattern: ");
        obj.display();
        
        System.out.print("Enter a number: ");
        int num = in.nextInt();
        obj.display(num);
        
    }
}