All perfect praise be to Allaah, the Lord of the worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu 'alayhi wa sallam, is His Slave and Messenger. According to the preponderant opinion, a womans voice is not 'Awrah. As for the examination under question, you are permitted to sit it and you are blameless even though the committee members are men, provided that you are not alone in private with a man. There should be a screen between you and them; and if there is not, you are required to dress according to the dress code approved by the Shareeah (Islamic law).
Allaah Knows best. (Source: islam_web) Classified in Women and Family > Fiqh of Women