On Monday, when Rahul complained to the school principal Nasrin Bano about the quality of food being served, she thrashed him with an iron rod; after which, he fell unconscious, police said.
Rahul's friends brought him home and his parents rushed him to a hospital nearby.
His father, Dharmendra Paswan, has lodged a complaint at the Dalanwala police station and a probe has been initiated, the police added.
The 11-year-old's relatives protested outside the school.
The school principal was suspended after preliminary investigations confirmed severe injuries to the child, Chief Education Officer of Dehradun, S B Joshi, said.
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