tuba
The double bass
All instruments produce a pitch.
The piccolo is the highest pitched instrument in the woodwind family
In a string orchestra, an orchestra with violin, cello, viola, and bass, the bass is the largest and lowest instrument. However, if you were looking for the largest string instrument in a full orchestra, the piano would be the instrument for which you are looking.
flute
Gimmick quad upright bass violins or contrabass claim to have ultra low frequencies. It takes a machine, two people, or a giant to play one. Traditionally, for practical use, the pipe organ with 26'+ stops is the lowest pitch.
That would be the Double Bass, also knows as a Bass Fiddle.
All three are true, assuming the definition of "tuned" is flexible. Any percussion instrument makes a certain sound, and most, if not all, will have an element of pitch which can be changed by tuning the instrument (shaving wood off of a woodblock, tightening a drum head, etc). The other two questions are definitely true - idiophones include the snare and timpani (kettledrum), and tuning an instrument means setting it to a certain pitch.
The tuba. This large brass member is pitched incredibly low, and is the lowest pitched brass instrument.
i play instrument all day long
All drums are in the percussion instrument family.
Oboe I find that hard to believe. Not piccolo? umm it is deff the oboe :)