नचिकेता और यम के बीच प्रसिद्ध दार्शनिक चर्चाएँ किस उपनिषद में मिलती हैं?

Shaunaka and Paippalada are two major recensions (shakhas) of which Veda?

In which of the following Aranyakas is the word 'Nagara' used for the first time in the sense of a 'city'?

The 'Prithvi Sukta' (Hymn to the Earth), which emphasizes devotion to the land stating 'The Earth is my Mother, I am her son', belongs to which Veda?