"There is little rice in the bowl."
Translation:A tálban kevés rizs van.
"Rice" is viewed as an uncountable mass quantity in English, so we say "little rice" and "a lot of rice." But we do not say "few rice" or "many rice."
You could talk about "few grains of rice" or "many grains of rice", though.
With this sentence, "There is not much rice in the bowl" sounds best to me.
For one thing, it's rizs, not risz.
Second, although your word order is probably grammatically possible, it sounds odd to have a tálban in the focus position right before the verb. It seems most likely that you want to tell the listener what is in the bowl, and for that, the word order should be A tálban kevés rizs van, as Duolingo gives it, or Kevés rizs van a tálban.
Even if the question you're answering is "Where is there some rice?" I don't think that your sentence would be a normal way of putting it (I think having that indefinite Kevés rizs in the first position is what makes it sound abnormal to me). I'll let native speakers weigh in on that, though.