He said three of the 11 infected girls are inmates of the school hostel while eight others are residents of Keshod town.
Ajudia said all the girls are asymptomatic and have been asked to remain in isolation at their respective homes.
Junagadh District Education Officer RS Upadhyay said the testing was carried out as per the guidelines issued by the state government.
"Out of 122 students who were randomly tested today, 11 girls found positive for coronavirus. They were asked to remain isolated at their respective homes. The school has been asked to sanitise the building daily. The academic work will continue by adhering to SOPs like wearing a mask and maintaining social distancing," Upadhyay said.
Last week, the state government had announced that schools for classes 10 and 12 and colleges for the final year graduation and post-graduation students can be reopened from January 11, as the fresh COVID-19 cases are on the decline.