Violins & violas look exactly the same. In what respects are they different?
Yes, they do look the same, but the violin plays higher notes than the viola. The viola is slightly larger and is deeper pitched and plays lower notes. Violins often play the melody where as violas tend to play inner parts that support the melody. We could compare the violins to the sopranos in a choir and the violas to the altos or tenors.