Which of the following architectural complexes built during the Sultanate period is celebrated as the earliest monument constructed entirely with true arches and true domes using scientific Islamic building principles in India?

💡 Solution & Explanation

The Alai Darwaza, built by Ala-ud-din Khilji as the southern gateway to the Quwwat-ul-Islam Mosque in 1311 CE, represents the earliest extant structure in India erected using scientifically engineered true arches and domes. The Qutb Minar complex utilizes earlier trabeate lintel techniques alongside later decorative arches. Tughlaqabad Fort features sloping walls characteristic of the Tughlaq architectural idiom.