Which parts of speech expresses a mild or sudden burst of emotions?

Which parts of speech expresses a mild or sudden burst of emotions? Correct Answer Interjection

যে সকল Word দ্বারা মনের আকস্মিক ভাব বা আবেগ (Mild of sudden burst of emotions) প্রকাশ করে তাদেরকে Interjection বলে ।

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Assertion A: Loss of head at a sudden expansion of a pipe is larger than that at a sudden contraction. Reason R: Separation of flow occurs at sudden contractions Which of the following is correct?