The Prashnopanishad is an ancient Sanskrit text, embedded inside Atharva Veda, ascribed to Pippalada sakha of Vedic scholars. It is a Mukhya Upanishad, and is listed as number 4 in the Muktika canon of 108 Upanishads of Hinduism

The Prashna Upanishad contains six Prashna (questions), and each is a chapter with a discussion of answers.The chapters end with the phrase, prasnaprativakanam, which literally means, "thus ends the answer to the question".In some manuscripts discovered in India, the Upanishad is divided into three Adhyayas (chapters) with a total of six Kandika's (कण्डिका, short sections).

Question 1 Rishi Kumar Kabandhi asked How was it the animal things came into being?

Question 2 Rishi Kumar Bhargava asked which are those deities who have the care of living beings? Who amongst them is the Enlightener, who is the chief?

Question 3 Rishi Kumar Kausalya asked where does the prana originate? How does he enter the body, and in what form does he remain after dividing himself up? How does he leave the body? How does he support that which is external to the bodying hold together that which is internal?

Question 4 Rishi Kumar Gargya asked which organs ceases to function in sleep, and which are active in sleep?  which deity is the enjoyer of dreams? From whom is this enjoyment derived, and in whom are all these finally absorbed?

Question 5 Rishi Kumar Satyakama asked What world will a man attain who meditates on Om throughout  his life ?

Question 6 Rishi Kumar Sukesha said one day a prince had asked me a question, If I knew Purusha and his sixteen parts.

he could not answer the prince. so can you explain that Purusha to me ??