A commission of inquiry examining abuse within the state's public service is this week focusing on the out-of-home care system.

Survivor Azra Beach told the commission she was physically and sexually abused as a child while in the care of a foster family.

Ms Beach, who says the state government has not provided an apology, said her foster mother broke her arm just before her fifth birthday and then slapped her when she didn't stop crying.

She was sexually abused by two men who knew her foster family, and said she recalled being visited by a child safety officer just once.

The inquiry has been told there is on average one allegation of child sexual abuse within the out-of-home care system a week.

Secretary of the Department of Communities, Michael Pervan, is among several witnesses slated to give evidence on Friday, as well as a victim-survivor.

Tasmania's Commissioner for Children and Young People, Leanne McLean, and Department of Communities Child Advocate Sonya Pringle-Jones will also appear before the inquiry.

The commission is set to hold 22 further days of public hearings and will deliver a final report by May next year.

Australian Associated Press