The state police had thrown a three-tier security layer around the examination centres to prevent any disturbance by the protesters.
The police have imposed prohibitory orders against gathering of people in the vicinity of the examination centres in the Telangana region.
At the exam centre in Hyderabad's Osmania University, students boycotted the exam and burnt the question paper. The protesting students as well as political leaders who came to support them were taken into custody.
The Public service commission examination to fill less than 200 posts has become a war of nerves for the Andhra Pradesh government.
Protests marred the Osmania University campus on Saturday, Sep 4, as students demanded the scrapping of the Andhra Pradesh Public Service Commission exam on Sunday, Sep 5, unless 42 percent of the posts were reserved for Telangana students.
Police have taken TRS activists and other Telangana supporters into preventive custody.