Astronomy quiz question: time to change moon phases

Astronomy 210 Quiz 1, spring semester 2012
Cuesta College, San Luis Obispo, CA

[Version 1]
Approximately how much time elapses between first quarter to full moon?
(A) An hour.
(B) Several hours.
(C) 12 hours.
(D) 24 hours.
(E) Several days.
(F) One week.
(G) Several weeks.
(H) 28 days.

Correct answer: (F)

The moon will take approximately four weeks to go through all eight of its phases, such that it will take approximately one week to go through two phases (starting from first quarter, to go through waxing gibbous, to end at full moon).

Section 30674
Exam code: quiz01n3Wb
(A) : 0 students
(B) : 1 student
(C) : 0 students
(D) : 0 students
(E) : 2 students
(F) : 26 students
(G) : 4 students
(H) : 1 student
(No response : 1 student)

Success level: 77% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.67

[Version 2]
Approximately how much time elapses between full moon to third quarter?
(A) An hour.
(B) Several hours.
(C) 12 hours.
(D) 24 hours.
(E) Several days.
(F) One week.
(G) Several weeks.
(H) 28 days.

Correct answer: (F)

Section 30676
Exam code: quiz01sH0p
(A) : 0 students
(B) : 0 students
(C) : 0 students
(D) : 0 students
(E) : 3 students
(F) : 35 students
(G) : 8 students
(H): 2 students

Success level: 75% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.62