What is the linguistic or grammatical difference between affirming or omitting the hamza of interrogation in the readings of indicative verses?

The affirmation of the hamza in certain verses of the Holy Quran indicates a denouncing interrogative from the disbelievers concerning the Resurrection, such as in His saying, the Almighty: "أَئِذَا مِتْنا" (Even when we are dead); this is an interrogative of denunciation and mockery, or an allusion to impossibility and exclusion. As for the omission of the hamza in some other verses, the interrogative is understood to be implied. The reciters have differed on the repetition of the interrogative; some of them have interrogated with both, while others sufficed with the interrogative in one without the other. Ibn Barri mentioned that the places where the repeated interrogative occurs are eleven instances in nine surahs.