The Pharaoh's authority was never questioned because the people of Egypt considered Pharaoh as God, who came down to rule Egypt for the remaining Gods.
Explanation
Being a religious society, Egyptians worshiped idols. Pharaoh is a name entitled to the sovereign of ancient Egypt.
They believed Pharaoh was a representative of Gods thereby serving as a mediator between Gods and people of Egypt.
His role was to maintain order and justice.
He owned all the land and made people work under him.
So, people were afraid to question him.
