ICSE Computer Application - Class X - 2025 SPECIMEN QUESTION PAPER - Quiz

False is the correct default value of a Boolean type.

The default value of a boolean variable in Java:

• In Java, if you declare a boolean instance variable (not local variable) and do not initialize it, its default value is false. ✅

• False and True (capitalized) are not valid in Java.

• 0 is an integer, not boolean.

Answer: false

Step 1: What is '\n' in Java?

• '\n' is a character literal → newline character.

• In Java, every character is stored in char type.

Step 2: Size of char in Java

• Unlike C/C++, where char is 1 byte,

• In Java, char is always 2 bytes (16 bits) because Java uses Unicode.

Step 3: Therefore

• '\n' is simply a char, so its size = 2 bytes.

✅ Answer: (a) 2 bytes

7.0 + (-3.0) = 4.0
✅ Answer: (d) 4.0

(a) length()

• For a String, length() returns an int (number of characters).
  ✅ Not a String.

(b) charAt(int)

• Returns the character (char) at a given index.
  ✅ Not a String.

(c) replace(char, char)

• Returns a new String with characters replaced.
  ✅ This one returns a String.

(d) indexOf(String)

• Returns the int index of the substring (or -1 if not found).
  ✅ Not a String.

Switch statement rules in Java

1. Checks for equality between the input expression and case labels → ✅ True

2. Supports floating point constants → ❌ Not allowed

   • In Java, switch can only work with:

     • byte, short, char, int

     • Their wrapper classes (Byte, Short, Character, Integer)

     • String

     • enum types

   • float and double are not allowed.

3. break is used to exit the switch block → ✅ True

4. Case labels are unique → ✅ True

✅ Answer: (b) supports floating point constants

Given array:

Statement:

Step 1: Value of ch[0]

• ch[0] → 'A'

• In Java, char is a numeric type under the hood (Unicode value)

• Unicode of 'A' → 65

Step 2: Multiply by 2

Step 3: Output

• Since we are using arithmetic, the result is int, not char.

• So it prints 130

✅ Answer: (b) 130

public class LoopTest {
    public static void main(String[] args) {
        int count = 0; // to count iterations
        
        for (int i = 11; i <= 30; i += 2) {
            System.out.println("i = " + i);
            count++;
        }
        
        System.out.println("Total iterations: " + count);
    }
}

Option (a)

• Sequence: 11, 13, 15, …, 29

• Total iterations: (30-11)/2 + 1 = 10 ✅

• Looks correct.

Option (b)

• Sequence: 11, 14, 17, …

• Iterations: (30-11)/3 + 1 = 7 ❌

• Not correct.

Option (c)

• Sequence: 11, 12, …, 19

• Iterations: 20-11 = 9 ❌

• Not correct.

Option (d)

• Sequence: 11, 12, …, 21

• Iterations: 21-11+1 = 11 ❌

• Not correct.

✅ Answer: (a) for (int i=11;i<=30;i+=2)

Let's carefully analyze:

We have a string array String s[]. We want the number of elements in the array.

• (a) s.length → ✅ Correct. For arrays in Java, .length without parentheses gives the number of elements.

• (b) s.length() → ❌ Incorrect. length() is used for String objects, not arrays.

• (c) length(s) → ❌ Not valid in Java.

• (d) len(s) → ❌ Python syntax, not Java.

Answer: (a) s.length