Interrogative (adjective)

1. Relating to or serving as an inquiry or request for information or knowledge.
2. Relating to or used in the formation of questions.

Origin:

Late latin interrogativus, from latin interrogare to ask, from inter- + rogare to ask.

Examples:

1. The interrogative tone of the reporter's voice indicated his skepticism.
2. The interrogative sentence asks a question and requires an answer.
3. The interrogative pronoun who is used to ask about the person being referred to.
4. The interrogative mood is used to form questions.
5. The interrogative form of the sentence is used to seek information or clarification.