Entry Exam Category: Graduate & Professional Program Admission Exams
Course: Praxis
Exam: Praxis Elementary Science 5005 Practice Test
Practice Question
Extract
Cloud Ground (Image showing a cloud above ground)
The preceding figure represents a cloud that has formed in the atmosphere above Earth's surface. Which of the following diagrams best illustrates the arrangement of charges in the cloud and on Earth's surface just before a cloud-to-ground lightning strike?
Answer Choices
- A: Cloud: top (+), middle (-), bottom (+); Ground: (-)
- B: Cloud: top (+), middle (+), bottom (-); Ground: (+)
- C: Cloud: top (-), middle (+), bottom (+); Ground: (-)
- D: Cloud: top (+), middle (-), bottom (-); Ground: (+)
Correct Answer: D
Rationale: Thundercloud: top +, base -, ground + induced. D correct. Others wrong separations, no discharge setup. Charge separation for lightning.