Q. During which festival is the Sal flower placed on house roofs by the village priest?
Answer: Sarhul
Notes: Sarhul is a tribal festival of Jharkhand celebrated in the spring (Chaitra) when Sal trees blossom. During Sarhul, the village priest known as Pahan distributes Sal flowers, which villagers place on their rooftops as part of a ritual called Phool Khonshi or Ful Kansi. The festival includes priestly fasting, sacrifices, dances, and community feasts. The Sal tree is revered as the abode of Sarna Maa, and the Sal flowers symbolize nature's harmony and prosperity. This custom is unique to Sarhul among the options listed.