Q. Which one of the following dynasties was ruling over North India at the time of Alexander’s invasion?
Answer: Nanda
Notes: Alexander invaded India in 326 BC. Nandas were ruling over India at that time.
The chronological order of these 4 dynasties was: Nanda, Maurya, Sunga and Kanvas. The Nanda dynasty ruled in northern part of the Indian subcontinent during the 4th century BCE, and possibly during the 5th century BCE. The Nandas overthrew the Shaishunaga dynasty in the Magadha region of eastern India, and expanded their empire to include a larger part of northern India.