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100+ Free ILTS Earth and Space Science (241) Practice Questions

Pass your ILTS Science: Earth and Space Science (241) Test exam on the first try — instant access, no signup required.

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2026 Statistics

Key Facts: ILTS Earth and Space Science (241) Exam

240

Passing Scaled Score

ILTS Earth and Space Science (241) test page

$110

Test Fee (2026)

ILTS Earth and Space Science (241) test page

100 MC

Test Format

ILTS Earth and Space Science (241) test page

3 hr 15 min

Testing Time

ILTS Earth and Space Science (241) test page

4 subareas

Content Domains

ILTS Earth and Space Science (241) framework

37%

Disciplinary Core Ideas Weight

ILTS Earth and Space Science (241) framework

26%

Earth Systems Weight

ILTS Earth and Space Science (241) framework

100-300

Score Scale Range

ILTS understanding your test results

ILTS Science: Earth and Space Science (241) is Illinois' earth and space science content licensure test, delivered by Pearson as a computer-based exam with 100 multiple-choice questions and a passing scaled score of 240. The test is weighted across four subareas: Science Process Skills 23%, Disciplinary Core Ideas 37%, Astronomy 14%, and Earth Systems 26%. The current public registration fee is $110 and candidates have 3 hours and 15 minutes of testing time. This free 100-question bank mirrors the official subarea weighting so candidates can practice across every subarea.

Sample ILTS Earth and Space Science (241) Practice Questions

Try these sample questions to test your ILTS Earth and Space Science (241) exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A science teacher wants students to test whether the color of a container affects how quickly water inside it warms in sunlight. Which variable should the students hold constant to ensure a valid test?
A.The volume of water in each container
B.The color of each container
C.The temperature measured at the end
D.The amount of sunlight reflected by each container
Explanation: In a controlled experiment, all variables except the one being tested (the independent variable) must be held constant. Here the independent variable is container color, so the volume of water, sunlight exposure, and starting temperature should all be kept the same to isolate the effect of color.
2A scientific theory differs from a scientific law primarily in that a theory
A.explains why natural phenomena occur, while a law describes what occurs
B.is an untested guess, while a law has been proven true
C.is less reliable than a hypothesis
D.can never be revised once it is accepted
Explanation: A scientific law describes a consistent observed relationship in nature (often mathematically), whereas a theory is a well-substantiated explanation of why that relationship occurs, supported by extensive evidence. Theories do not 'graduate' into laws; they serve different explanatory roles.
3Which measurement is expressed in SI base units appropriate for reporting the mass of a rock sample in a laboratory?
A.152 grams
B.152 newtons
C.152 milliliters
D.152 pascals
Explanation: Mass in the SI system is measured in grams or kilograms. A balance reports mass directly, so grams is the correct unit for a rock sample's mass.
4A student records the following mass measurements of the same object: 24.8 g, 24.9 g, and 24.7 g. The accepted value is 30.0 g. These results are best described as
A.precise but not accurate
B.accurate but not precise
C.both accurate and precise
D.neither accurate nor precise
Explanation: Precision refers to how closely repeated measurements agree with one another; the three values cluster tightly, so they are precise. Accuracy refers to closeness to the true value of 30.0 g, and since all values are well below it, they are not accurate.
5When evaluating the credibility of a scientific claim found online, the strongest indicator of reliability is that the claim
A.has been peer-reviewed and reproduced by independent researchers
B.appears on a website with a professional design
C.is stated by a person with a large social media following
D.agrees with the reader's existing beliefs
Explanation: Peer review and independent reproduction are central to scientific credibility because they subject findings to expert scrutiny and verification by others. Claims that survive this process are far more trustworthy than those that have not.
6A graph shows global average temperature on the y-axis and year on the x-axis, with a clearly rising trend line. The most appropriate conclusion a scientist can draw directly from this graph is that
A.global average temperature increased over the time period shown
B.carbon dioxide caused the temperature increase
C.the temperature will continue rising forever
D.the data must be incorrect because temperature cannot change
Explanation: A conclusion drawn directly from a graph must be supported by what the graph actually displays. The graph plots temperature versus time and shows an increase, so the only directly supported statement is that temperature rose over that interval.
7Which of the following best represents a testable hypothesis for a controlled experiment?
A.If soil is enriched with nitrogen, then plant growth will increase compared with untreated soil
B.Plants are beautiful and important to ecosystems
C.What factors affect how plants grow?
D.Nitrogen is an element on the periodic table
Explanation: A testable hypothesis proposes a predicted relationship between an independent variable (nitrogen enrichment) and a dependent variable (plant growth) in a form that can be supported or refuted by experiment. The 'if...then' structure makes the prediction explicit.
8A measurement of 0.00456 meters expressed in scientific notation is
A.4.56 x 10^-3 m
B.4.56 x 10^3 m
C.45.6 x 10^-4 m
D.0.456 x 10^-2 m
Explanation: Scientific notation requires a coefficient between 1 and 10 multiplied by a power of ten. Moving the decimal point three places to the right to get 4.56 corresponds to multiplying by 10^-3, giving 4.56 x 10^-3 m.
9In an experiment, the variable that the investigator deliberately changes to observe its effect is called the
A.independent variable
B.dependent variable
C.controlled variable
D.confounding variable
Explanation: The independent variable is the factor the experimenter intentionally manipulates. The dependent variable responds to that change, while controlled variables are kept constant.
10A scientific model, such as a globe or a computer simulation of the atmosphere, is most useful because it
A.represents a system in a simplified way to help explain and predict behavior
B.perfectly reproduces every detail of the real system
C.eliminates the need for any further observation
D.proves that a hypothesis is absolutely true
Explanation: Models are simplified representations of complex systems that allow scientists to visualize, explain, and make predictions about phenomena that are too large, small, slow, or fast to observe directly. Their value lies in being useful approximations, not exact copies.

About the ILTS Earth and Space Science (241) Exam

The ILTS Science: Earth and Space Science (241) test is the content-area assessment for the Illinois Earth and Space Science (grades 9-12) teaching endorsement. The computer-based test includes 100 multiple-choice (selected-response) questions organized into four subareas: Science Process Skills, Disciplinary Core Ideas, Astronomy, and Earth Systems, covering scientific inquiry, foundational science content, the universe, and the geology, hydrology, and meteorology of the Earth.

Questions

100 scored questions

Time Limit

3 hours 15 minutes of testing (about 3.5-hour total appointment)

Passing Score

240 scaled score

Exam Fee

$110 (Illinois State Board of Education (ISBE) / Pearson)

ILTS Earth and Space Science (241) Exam Content Outline

23% of this test

Science Process Skills (Subarea I)

The nature and historical development of science, scientific methods and investigations, experimental design and variables, measurement and SI units, accuracy and precision, significant figures, evaluating scientific claims and the role of peer review, data analysis and graphing, scientific models, systems thinking, and discipline-specific literacy such as reading topographic maps and graphs.

37% of this test

Disciplinary Core Ideas (Subarea II)

Broad foundational science content including chemistry (atomic structure, the periodic table, chemical bonding and reactions, conservation of mass, phases of matter, acids and bases, radioactivity), physics (Newton's laws, fundamental forces, work and energy, energy transfer, wave behavior), biology (cells, photosynthesis, genetics, evolution and natural selection, taxonomy), and environmental science (ecosystems, energy flow, biogeochemical cycles, biodiversity, natural hazards, and resources).

14% of this test

Astronomy (Subarea III)

Origin and structure of the universe, the Big Bang theory and supporting evidence such as redshift and the cosmic microwave background, star formation in nebulae, stellar life cycles, galaxies, the solar system, gravitation and Kepler's laws of orbital motion, astronomical tools such as spectroscopes and telescopes, units like the light-year, and the history of space exploration.

26% of this test

Earth Systems (Subarea IV)

Geology including Earth's internal layers, plate tectonics and plate boundaries, the rock cycle, minerals and mineral identification, geologic time, relative and radiometric dating, fossils, and unconformities; hydrology and oceanography including the water cycle, groundwater and aquifers, ocean properties, currents, tides, and glaciers; and meteorology and atmospheric science including atmospheric layers and composition, weather fronts, climate, and the Coriolis effect.

How to Pass the ILTS Earth and Space Science (241) Exam

What You Need to Know

  • Passing score: 240 scaled score
  • Exam length: 100 questions
  • Time limit: 3 hours 15 minutes of testing (about 3.5-hour total appointment)
  • Exam fee: $110

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

ILTS Earth and Space Science (241) Study Tips from Top Performers

1Allocate study time by subarea weight: Disciplinary Core Ideas is the heaviest at 37%, followed by Earth Systems at 26%, Science Process Skills at 23%, and Astronomy at 14%
2Review broad foundational science, since Disciplinary Core Ideas pulls from chemistry, physics, biology, and environmental science, not just earth science
3Master earth systems content including plate tectonics, the rock cycle, geologic time, the water cycle, ocean processes, and atmospheric layers
4Practice scientific inquiry skills such as identifying variables, evaluating claims, interpreting graphs, and using SI units and significant figures
5Know key astronomy concepts including the Big Bang evidence, stellar life cycles, gravitation, and Kepler's laws of planetary motion
6Use timed mixed practice sets to build pacing for answering 100 multiple-choice questions in 3 hours and 15 minutes

Frequently Asked Questions

What is on the ILTS Earth and Space Science (241) test?

The test covers four subareas: Science Process Skills (23%), Disciplinary Core Ideas (37%), Astronomy (14%), and Earth Systems (26%). All questions are multiple-choice, and the content ranges from scientific inquiry and foundational chemistry, physics, and biology to astronomy, geology, hydrology, and meteorology.

How many questions are on the ILTS 241 test and what is the format?

The computer-based test has 100 multiple-choice (selected-response) questions. There are no constructed-response or essay items on the Earth and Space Science (241) test.

What is the passing score for ILTS Earth and Space Science (241)?

You need a scaled score of 240 to pass the ILTS Earth and Space Science (241) test, on a scale that ranges from 100 to 300. The 240 passing score is standard across ILTS content tests.

How much does the ILTS 241 test cost in 2026?

The current registration fee listed on the official ILTS test page is $110. Always confirm the exact amount in your Pearson ILTS registration account before checkout, since fees can change and additional service charges may apply.

How long is the ILTS Earth and Space Science (241) test?

You have 3 hours and 15 minutes of testing time within a total appointment of about 3.5 hours, which includes time for the tutorial and nondisclosure agreement. Budget your time across all 100 multiple-choice questions.

Which subarea is weighted most heavily on the ILTS 241 test?

Disciplinary Core Ideas is the heaviest subarea at 37% of the test, followed by Earth Systems at 26%, Science Process Skills at 23%, and Astronomy at 14%. Focus your study time proportionally on these weightings.