The long-necked, plucked string instrument common in north indian classical music is called the:

Tanpura: it does not play melody but rather supports and sustains the melody of another instrument or singer by providing a continuous harmonic bourdon or drone

Trumpets, saxophone, trombone, flute, french horn  mostly in jazz or classic.  you can answer the rest thats on your own honestly 

Opposition of two melodic ideas is the  right answer