Astronomy quiz question: moorise to moonset time

Astronomy 210 Quiz 1, Spring Semester 2009
Cuesta College, San Luis Obispo, CA

[4.0 points.] In general, approximately how much time elapses between moonrise to moonset?
(A) An hour.
(B) 12 hours.
(C) 24 hours.
(D) 28 days.

Section 30676
(A) : 0 students
(B) : 62 students
(C) : 1 student
(D) : 1 student

Correct answer: (B)

The Moon takes approximately 12 hours to rise and set (with variations due to its motion along its orbit around the Earth, and its position with regards to the ecliptic due to the tilt of its orbit).

"Difficulty level": 94% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.11