Which river is the longest in India and flows through the states of Uttarakhand, Uttar Pradesh, Bihar, and West Bengal?

Which river flows through the states of Uttar Pradesh and Bihar and is a tributary of the Ganges?

Which river flows through the states of Maharashtra, Telangana, and Andhra Pradesh before emptying into the Bay of Bengal?

Which river flows through the states of Arunachal Pradesh and Assam and is a tributary of the Brahmaputra?

Which river flows through the states of Punjab?

Which river flows through the states of Maharashtra and Telangana and is a tributary of the Godavari?