Mohammadian claimed a silver medal in the Men’s Shot Put F42 with a throw of 14.54 in the event underway in Doha, Qatar.
Aled Davies threw a new championship record (14.95) to win Britain’s first gold on day one.
Bronze medal went to Germany’s Frank Tinnemeier with 14.33.
In the Men’s Discus Throw F56, Mohammadyari seized a silver medal with 44.97.
Gold medal went to Leonardo Diaz from Cuba with 45.10 and Vietnamese Hau Nguyen Be won the bronze medal with 38.94.