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ORELA Middle Grades General Science (204) Practice Tests & Test Prep by Exam Edge - Free Test


Our free ORELA Middle Grades General Science (204) Practice Test was created by experienced educators who designed them to align with the official Oregon Educator Licensure Assessments content guidelines. They were built to accurately mirror the real exam's structure, coverage of topics, difficulty, and types of questions.

Upon completing your free practice test, it will be instantly reviewed to give you an idea of your score and potential performance on the actual test. Carefully study your feedback to each question to assess whether your responses were correct or incorrect. This is an effective way to highlight your strengths and weaknesses across different content areas, guiding you on where to concentrate your study efforts for improvement on future tests. Our detailed explanations will provide the information you need to enhance your understanding of the exam content and help you build your knowledge base leading you to better test results.

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ORELA Middle Grades General Science - Free Test Sample Questions

An observatory in Phoenix analyzed the spectrum of over 20,000 stars. They were not surprised to find that every star had the spectral lines for which of the following?

Correct Answer:
helium and hydrogen.


the correct answer to the question is that every star had the spectral lines for helium and hydrogen. this result is unsurprising given the fundamental composition and processes that occur in stars.

hydrogen, the simplest and most abundant element in the universe, is a key component of stars. in the cores of stars, hydrogen nuclei undergo nuclear fusion, where they combine under extreme pressure and temperature to form helium, releasing a vast amount of energy in the process. this energy is crucial as it supports the star against gravitational collapse and is the source of light and heat radiated by stars.

helium, the second lightest and the second most abundant element in the universe, is also naturally found in stars as a product of the fusion of hydrogen atoms. since all stars go through a lifecycle that involves hydrogen fusion (at least in their main-sequence phase), the presence of helium in their spectra along with hydrogen is expected.

spectral lines are unique identifiers of elements present in a star, based on the absorption or emission of light at specific wavelengths. when a star's light is analyzed through spectroscopy, the presence of hydrogen and helium can be detected by their characteristic spectral lines. the fact that these lines are observed in every star is a testament to the universal nature of these nuclear processes across various types of stars.

thus, the observatory's findings that every star displayed spectral lines for hydrogen and helium aligns well with our understanding of stellar composition and nuclear fusion processes. this universal presence underscores the fundamental role these elements play in the life and characteristics of stars.