20161028

Astronomy quiz question: largest star?

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

Which star is the largest?
(A) B5 supergiant.
(B) K5 supergiant.
(C) B0 main-sequence star.
(D) K0 main-sequence star.
(E) (There is a tie.)

Correct answer (highlight to unhide): (B)

An H-R diagram is provided with this quiz.


These stars are plotted on an H-R diagram below. The K5 supergiant is the largest (with a radius more than 100× larger than the sun), followed by the B5 supergiant, the B0 main-sequence star, and the K0 main-sequence star is the smallest.


Section 70158
Exam code: quiz05s4nD
(A) : 5 students
(B) : 20 students
(C) : 4 students
(D) : 2 students
(E) : 6 students
(F) : 0 students

Success level: 57% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.60

Section 70160
Exam code: quiz05n0Ko
(A) : 4 students
(B) : 16 students
(C) : 1 student
(D) : 1 student
(E) : 3 students
(F) : 0 students

Success level: 68% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.73

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