質問: my favorite subject (in school) is science は 日本語 で何と言いますか? my favorite subject (in school) is science は 日本語 で何と言いますか?
回答: i would say「私の一番好きな科目は理科(rika)です。」 generally, science is translated into 科学. instead of 科学, however, 理科 is used as a name of the sucject at elementary and junior high school. at high school and university, 理科 is divided into 4 subjects, physics(物理 "butsuri"), chemistry(化学 "kagaku"), biology(生物 "seibutsu"), and earth science(地学 "chigaku"), so at this level of education, 理科 is not a name of a subject, but a generic term. as a result, both 理科 and 科学 are the same in meaning. note that both 科学 and 化学 are pronounced the same, "kagaku", so be careful not to confuse them. while 科学 means science, 化学 means chemistry. when speaking, we call 化学 "bakegaku" to avoid confusion.