With reference to the scientific progress of ancient India, which of the statements given below are correct?

The Chinese traveller Yuan Chwang (Hiuen Tsang) who visited India recorded the general conditions and culture of India at that time. In this context, which of the following statements is/are correct? 1. The roads and river-routes were completely immune from robbery. 2. As regards punishment for offences, ordeals by fire, water and poison were the instruments for determining the innocence or guilt of a person. 3. The tradesmen had to pay duties at ferries and barrier stations. Select the correct answer using the codes given below.

With reference to the history of India, the terms "kulyavapa" and "dronavapa" denote

From the decline of Guptas until the rise of Harshavardhana in the early seventh century, which of the following kingdoms were holding power in Northern India? 1. The Guptas of Magadha 2. The Paramaras of Malwa 3. The Pushyabhutis of Thanesar 4. The Maukharis of Kanauj 5. The Yadavas of Devagiri 6. The Maitrakas of Valabhi