What is the term used for the iris opening of a lens usually measured in f-stops?

Where did the earliest jazz groups perform?

a. Concert halls b. Dances and parties c. Parades, picnics and sporting events d. b and c e. a and b

How would you best describe the timbre of the lead voice on "Eagle Dance"? (PL 4-1)

A. light and airy. B. tense and strained. C. smooth and silky. D. rich and mellow.