The various melodies heard in Antonin Dvořák's "String Quartet in F Major" have a folk-like quality.
There are some instances in this string quartet which are reminiscent of American, Slavonic, and other culture's folk music, meaning music sang and played within the groups of 'ordinary people.' It was written in the pentatonic scale which is common with folk music.
1 and 2 and 3 -(4) would be so maybe the last answer depending on how y’all are taught
First one: It would be on Sol
Second one: No. It would be on La. The note is B. And is a Bflat
(I don't know Bass Clef as well. I play Alto Sax, which uses Treble Clef. So please forgive me)
Third one: It would be A flat
Fourth one: It would be C then C flat
(Again, I don't know Bass Clef that well, so don't count on my answers)