ICSE Computer Applications Class 10 – Previous Year Question Papers & Solutions - Quiz

Let's break down the two string method operations in Java for the string "MISSISSIPPI":

1. "MISSISSIPPI".indexOf('S')

The indexOf('S') method returns the index of the first occurrence of the character 'S' in the string "MISSISSIPPI".

• The string "MISSISSIPPI" has the following indices:

  
  M  I  S  S  I  S  S  I  P  P  I
  0  1  2  3  4  5  6  7  8  9 10
  
  

• The first occurrence of 'S' is at index 2.

So, "MISSISSIPPI".indexOf('S') returns 2.

2. "MISSISSIPPI".lastIndexOf('I')

The lastIndexOf('I') method returns the index of the last occurrence of the character 'I' in the string "MISSISSIPPI".

• From the same index mapping, the last occurrence of 'I' is at index 10.

So, "MISSISSIPPI".lastIndexOf('I') returns 10.

Addition Operation

Now, adding these two results together:

indexOf('S') + lastIndexOf('I')
= 2 + 10
= 12

So, the correct answer is:

12

The break statement is used to exit the current loop.

Here is an example in Java to demonstrate its usage:

public class BreakStatementExample {
    public static void main(String[] args) {
        // Loop from 1 to 5
        for (int i = 1; i <= 5; i++) {
            if (i == 3) {
                break; // Exit the loop when i is 3
            }
            System.out.println("Iteration: " + i);
        }
        System.out.println("Loop exited.");
    }
}

Output:

Iteration: 1
Iteration: 2
Loop exited.

In this example, the break statement exits the loop when i equals 3, so the loop stops executing and the program continues with the next statement after the loop.

Explanation:

In Call by Value, the values of the actual parameters are copied to the formal parameters. Any changes made to the formal parameters do not affect the actual parameters.

POS

Reason — The substring() method returns a substring beginning from the startindex and extending to the character at endIndex - 1. Since a string index begins at 0, the character at index 3 is 'P' and the character at index 5 (6-1 = 5) is 'S'. Thus, "POS" is extracted.

Pure method

Reason — A method which does not modify the value of variables is termed as a pure method.

Wrapper

Reason — Wrapper class is used to convert a primitive data type to its corresponding object.

Each double in Java occupies 8 bytes, and the array contains 4 elements.

Total memory occupied = 8 bytes × 4 = 32 bytes

Correct answer: (d) 32

User-defined Data Type

• array is not a user-defined data type; it is a derived data type.

• double is a primitive data type (not user-defined).

• class is a user-defined data type.

• boolean is a primitive data type.

✅ Correct Answer: (b) 1 and 3 (Array and Class)

(a) public
Explanation: A post office is accessible to everyone, similar to public access specifier.