Entry Exam Category: Graduate & Professional Program Admission Exams
Course: Praxis
Exam: Praxis Elementary Science 5005 Practice Test
Practice Question
A teacher is introducing the geologic time scale to third-grade students. She tells them that the entire history of Earth, from its formation to the present day, was 24 hours long, with 12:00 midnight representing the time of the formation of Earth and 12:00 midnight the following night representing the present day. About what time did humans appear in this 24-hour time scale?
Answer Choices
- A: 11:58 PM
- B: 9:00 PM
- C: 6:00 PM
- D: 1:00 PM
Correct Answer: A
Rationale: Earth 4.54B years as 24h, humans recent ~200K years, last ~2 min, 11:58 PM. B,C,D too early, pre-human eras. Analogy shows recency.