Q. Which fort did Raja Nain Singh Nagar restore in the 18th century?
Answer: Fort Parikshitgarh
Notes: Raja Nain Singh Nagar restored Fort Parikshitgarh in Meerut, Uttar Pradesh, in the 18th century. The British dismantled the fort in 1857 during the Indian Rebellion to prevent its use by revolutionaries. Other forts listed are significant but unrelated to this event.