if rubber band streched ________ sound produced.

1) low pitch 2) high pitch 3) some times low and high pitch 4) none of these

If rubber band is stretched sometimes low and high pitch sound produced.
This is so because the pitch depends on the stretching up of the length.Higher pitches are obtained for those rubber bands that are stretched too much. Such rubber bands are mostly thin.
On the other hand , those rubber bands which are quite thick produce low pitch sound on being stretched with the same force because their length isn't stretched that much.