Q. Which of the following re-established the authority of the king in Delhi, which had been eroded since the death of Firoz Shah Tughlaq?
Answer: Babur
Notes: Babur re-established authority in Delhi after Firoz Shah Tughlaq's death. His victory at the First Battle of Panipat in 1526 marked the start of the Mughal Empire. He introduced advanced military tactics, including gunpowder and field artillery, and implemented administrative reforms while promoting Persian culture. His memoir, the Baburnama, details his life and the socio-political conditions of his time.