Topic: Adjective (বিশেষণ),

Best Answer Explained in Below-:

In the sentence "The 'scaled' envelope contains OMR sheets," the word "scaled" serves as an adjective. Adjectives are words that describe or modify nouns, providing more information about their attributes or qualities. In this case, "envelope" is the noun and "scaled" describes a specific characteristic of the envelope.

The term "scaled" likely refers to the size or measurement of the envelope in relation to a standard or expected size, indicating that it has been adjusted or modified in some way (for example, to fit a particular purpose). This descriptive function aligns with the role of adjectives, which help clarify or specify the noun further.

If we analyze the other options: "noun" would suggest that "scaled" is a thing (which it is not), "verb" indicates an action (and "scaled" does not represent an action in this context), and "adverb" typically modifies verbs, adjectives, or other adverbs (which is not applicable here). Thus, the appropriate classification of the underlined word "scaled" in this context is indeed an adjective.