Astronomy quiz question: smallest star?

Astronomy 210 Quiz 5, spring semester 2016
Cuesta College, San Luis Obispo, CA

Which star is the smallest?
(A) A0 white dwarf.
(B) M0 red dwarf.
(C) G5 main-sequence star.
(D) B5 main-sequence star.
(E) (There is a tie.)

Correct answer (highlight to unhide): (A)

An H-R diagram is provided with this quiz.

These stars are plotted on an H-R diagram below. The A0 white dwarf is the smallest star, followed by the M0 red dwarf, then the G5 main-sequence star, while the B5 main-sequence star is the largest.

Section 30676
Exam code: quiz05sPrB
(A) : 27 students
(B) : 5 students
(C) : 3 students
(D) : 5 students
(E) : 11 students

Success level: 54% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.79

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