Which mountain range separates the Kullu Valley from the Spiti Valley in Himachal Pradesh?

Which mountain range separates the Brahmaputra Valley from the Barak Valley in Assam?

Which is the highest peak in the Vindhya Range of Madhya Pradesh?

Which is the highest peak in the Satpura Range of Madhya Pradesh?

Which of the following is the oldest mountain range in India?

Which one of the following mountain ranges is spread over only one state in India?