Q. Which is the oldest veda of all?
Answer: Rig Veda
Notes: The Rig Veda is the oldest among the four Vedas; the other being Sam veda, Yajur veda and Atharva veda. Considered to be amongst the earliest religious texts still revered by a living tradition, it is estimated to have been formed around 1500–1200 BCduring the Early Vedic period. It is a collection of 1,028 hymns and 10,600 verses, organized into ten books (Mandalas).