Kumar clocked 1:54.11 to push Iran's Abdolrahim Dorzadeh (1:54.23) to the runners-up spot.
Fuki Torii of Japan took bronze in 1:54.55.
India also bagged a bronze in the men's 4x100m event with the quartet of Prajwal Ravi, Akash Kumar, Nithin Balakumar and Gurindervir Singh registering a time of 40.75 seconds.
Hosts Japan won the title with Yuki Takagi, Daisuke Miyamoto, Satoru Fukushima and Justin Junpei Tsukamoto clocking 39.65 seconds.
Chinese Taipei's Lin Yu-tang, Wei Tai-sheng, Lu Hao-hua and Yeh Shou-po took silver with 39.72 seconds.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
