Q. Purana Qila was constructed during the reign of which of the following? Answer:
Sher Shah
Notes: The founder of the Suri Dynasty, Sher Shah Suri, defeated Humayun in 1540, naming the fort Shergarh; he added several more structures in the complex during his five-year reign. Purana Qila and its environs flourished as the "sixth city of Delhi".