Up to date there are 5: Woodwinds, Brass, Strings, percussion, and electronic.
Four.
Strings, winds, brass, percussion.
The Ukulele Orchestra of Great Britain uses them exclusively. Many Hawaiian groups concentrate on the ukulele.
four
There are usually no mandolins in an orchestra.
it depends on the orchestra
Usually there are no baritones in an orchestra.
London Symphony Orchestra Philharmonia Orchestra Royal Philharmonic Orchestra The Halle Orchestra and maybe many others
His family
There are about three to four trumpet players in an orchestra.
In a typical orchestra, zero. None.
There are usually four kettle drums in an orchestra