Rahul, who lives in Barnet, beat his nine-year-old opponent, Ronan, 10-4 in the programme's finale on Saturday night, the BBC reported.
Rahul, who has an IQ high enough to be a member of Mensa, the world's largest and oldest high IQ society, fought off competition from 19 children aged eight to 12 in the week-long show.
He clinched the title by answering a question on 19th Century artists William Holman Hunt and John Everett Millais.
In the final, Rahul's chosen subject was Edward Jenner's medical innovation and methodology in 18th Century England. He and Ronan both scored 15 in their specialist fields.
Rahul said he was "extremely delighted to win" and congratulated Ronan and the other contestants, the BBC reported.
He had impressed audiences and quizmaster Richard Osman in the first round on Monday by answering every question he was asked correctly.
Rahul's father, Minesh is an IT manager and mother Komal, a pharmacist. They entered him into the competition and called his success a "phenomenal achievement".
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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Doraiah Chowdary Vundavally is a Software engineer at VTech . He is the news editor of SocialNews.XYZ and Freelance writer-contributes Telugu and English Columns on Films, Politics, and Gossips. He is the primary contributor for South Cinema Section of SocialNews.XYZ. His mission is to help to develop SocialNews.XYZ into a News website that has no bias or judgement towards any.