Does anyone know the answers to these questions?
Q: What is the largest hand held musical instrument, is it the contrabass sax, suzephone or somthing else?

Q: What brass instument has the smallest mouth peice?

Q: What is the deepest instrument?

Q: What is the highest instument?

Q: A personnel question, What is your favourite instument to LISTEN

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thank you
rdec

Here are my suggestions for answers.
Q: What is the largest hand held musical instrument?
A: Perhaps the Alp Horn.
Q: What brass instument has the smallest mouth peice?
A: Depends on what they call small. Typically the answer would be french horn, but there are trumpet mouthpieces with very shallow cups and if you measure actual volume it could be one of them.

Q: What is the deepest instrument?
A: Many pipe organs go as low as 16Hz. If you are talking about the lowest wind insturment I would guess it to be the ContraBassoon (of today's modern instruments)

Q: What is the highest instument?
A: Highest wind instrumentI think is piccolo. Again, I believe some organs have some pretty darn small pipes that go above what any piccolo can.

Q: Favourite instument to LISTEN to?
A: Cello or Bass Clarinet.

I agree with JohnLoveMusic on the most part. Actually, the highest woodwind instrument might be the piccolo oboe...but don't quote me.

Personally my favorite instrument to listen to is harp, or bassoon, or harp and bassoon duets!

Q: What is the deepest instrument? A: Many pipe organs go as low as 16Hz. If you are talking about the lowest wind insturment I would guess it to be the ContraBassoon (of today's modern instruments) Q: What is the highest instument? A: Highest wind instrumentI think is piccolo.

If we're going to count "many" pipe organs, then we'd might as well count the synthesizer as well. The syntheszier can play lower and higher than any other instrument. If we don't count the organ or the synthesizer, then the answer for both lowest and highest is the piano. Sixteen cycles per second, by the way, is below human hearing.

Okay,
I had to get my books out and look some things up.

The question was not the lowest note you could hear, but the losest note an instrument could play. Sixteen cycles per second is considered below the human hearing level. However much music is written for feel. And the 16 Hz organ pipes are designed just for that - and yes, they are tunable (if you don't know how or why then you need to take some lessons from me).

The Lowest piano note is C-1 at 16.35 Hz (Bosendorfer). Most modern standard pianos lowest note is A0 at 27.5 Hz (early pianos and harpsichords are 27.25 Hz), the highest piano pitch is C7 at 4186 Hz.

To the best of my knowledge the lowest note recorded played on an instrument is a C-2 at 4.1 Hz, the instrument was a Subcontrabass Clarinet. The highest flute voice is a C7 at 2093 Hz. So, the piano beats it out at 4086.

Want to go further? Some people have better hearing than others. If we include harmonics of instruments then the French horn is the highest wind instrument at over 90,000 Hz, the percussion's Claves measure out at 102,000 Hz. These are measurable sounds above normal background noise. The numbers go higher is you isolate the instruments into a sound proof room.

thank you all!

"The highest flute voice is a C7 at 2093 Hz"

Just a point of correction,
This C7 isn't the highest note of the flute although many less advanced fingering charts only go up that high. As a point of fact J.J. Quantz published Traverso flute fingerings for the High C7 back in the 1700s but also didn't recommend anything above E6 as being artistically practical.
For the Boehm Concert C flute, there are fingerings that go to the F# ~2959.96 above that C7 although, I've not seen it used as yet. The high F natural 2793.83 has been regularly played though in Sir James Galway's performances of the Ibert Flute Concerto since about 1974. One factor in hitting these notes aside from the ability of the player and their conditioning is the cut of the head joint.

The piccolo (Flauto Piccolo) has the capability of reaching the C8 ~4186 at least but of course this is dependent on the player and the instrument. So, some may be able to play higher.

A final point,
There are smaller members of the Recorder (also a flute) family that may be of the highest in the wind instruments:
http://en.wikipedia.org/wiki/Recorder
If you will observe, the tiny "garklein" recorder sounds a pitch one octave above D7 ~4698.