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

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Q: Which of the following returns a String?

A length()
B charAt(int)
C replace(char, char)
D indexOf(String)

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Answer: C

Explanation:

(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.

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