Which period is called the era of “the rule of the Forty” in the history of Delhi Sultanate age?

Which dynasty of Delhi Sultanate ruled for the shortest period?

The Sultans of which dynasty ruled the country for the longest period?

Which of the following places was diamond mining carried out during the Delhi Sultanate period?

Which ruler of Delhi Sultanate is known as “Lakh Baksh”?

Which Ruler of Delhi Sultanate declared himself as "Khalifa"?