In Japanese, all syllables, with a few exceptions, are pronounced with equal length and loudness. In Japanese, a stressed syllable is merely pronounced at a higher pitch. This is part of the Japanese intonation pattern. Japanese does have a distinct intonation pattern. Their intonation pattern can be heard not only in individual words, but also in whole sentences.
Intonation is produced by a rise and fall in pitch over certain syllables.
In the case of questions, the Japanese intonation pattern bears no relation to the English one. This is a source of a lot of confusion. What typical Japanese syllables look like. ABC no Tanka desu. Senga-san, Nupiidia no kaishain desu.