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25 multiple-choice questions and 75 flashcards, written to the Next Generation Science Standards blueprint. Every question carries a full rationale.
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Next Generation Science Standards (NGSS) — Grade 5: Structure & Properties of Matter (5-PS1), Motion & Stability (5-PS2), Energy (5-PS3), Ecosystems (5-LS1, 5-LS2), Earth Systems (5-ESS1, 5-ESS2, 5-ESS3). Public standards from nextgenscience.org.
CoStudy's 5th Grade Science bank holds 100 items. Every multiple-choice question carries a written rationale explaining why the correct answer is correct and why each distractor is tempting but wrong.
A sample of 12 multiple-choice questions from the bank, with the full rationale shown.
In any reaction, matter is:
Answer: D — Conserved
Conservation of matter — total mass stays constant. (A),(B),(C) wrong.
Why don't we feel Earth moving through space?
Answer: B — We are moving with it at the same speed
We share Earth's motion → no relative acceleration felt. (A),(C),(D) wrong.
Which property does NOT change when you cut wood in half?
Answer: C — Material (it's still wood)
Material identity doesn't change with cutting. (A),(B),(D) all change.
Earth's atmosphere is made mostly of:
Answer: D — Nitrogen
~78% nitrogen, 21% oxygen. (A),(C),(B) smaller portions.
When water freezes, it changes from:
Answer: C — Liquid to solid
Freezing = liquid → solid. (A),(B),(D) different changes.
Objects fall because:
Answer: D — Gravity pulls them
Falling happens because of gravity's pull, so D is correct. A) Air pushing isn't what causes objects to fall. B) Wind isn't needed for something to fall. C) Objects don't have wants — this is a common misconception, not a scientific reason.
A 'producer' in an ecosystem:
Answer: A — Makes its own food
Producers = plants/algae making food. (B) is consumer; (C) is decomposer; (D) is too narrow.
Most of Earth's water is found in:
Answer: B — Oceans
~97% in oceans. (A),(C),(D) much smaller.
What are the three common states of matter?
Answer: A — Solid, liquid, gas
Three states = solid/liquid/gas. (B),(C),(D) are properties.
Most of Earth's fresh water is locked in:
Answer: C — Ice and glaciers
Most fresh water is frozen in ice. (A),(B) smaller; (D) is groundwater, second.
In a food chain, an arrow points from:
Answer: A — Food to eater (energy flow)
Arrows show energy moving from food TO consumer. (B),(C),(D) wrong.
Where does almost all energy in ecosystems start?
Answer: D — Sun
Sun powers photosynthesis → food chains. (A),(C),(B) wrong.
6 sample cards from the 75 in the bank.
Where does the energy in food come from?
Originally from the sun. Plants capture sunlight; animals get energy by eating plants or other animals.
What happens to objects in orbit (like satellites)?
They're falling around Earth — gravity pulls them in, but their forward motion keeps them missing.
What is a 'carnivore'?
An animal that eats only meat. Like lions, hawks, sharks.
What is the sun?
A star — the closest one to Earth. About 93 million miles away.
How does matter cycle in an ecosystem?
Plants take from soil/air, animals eat plants, decomposers return matter to soil — it cycles around.
How do stars compare to each other?
They differ in size, color (which shows temperature), and brightness. Some are bigger than our sun, some smaller.
These samples are a small slice. The full bank runs flashcards, multiple choice and timed mock exams with per-chapter progress tracking, on the web and in the iOS app.
The 5th Grade Science bank holds 100 items: 25 multiple-choice questions, 75 flashcards. 18 of them are on this page to read free, with no signup.
Yes. Every multiple-choice item carries a written rationale that states the controlling principle behind the correct answer and then addresses each wrong option in turn — why it tempts and precisely where it fails. Knowing why the plausible answer was wrong is worth more than knowing which letter was right.
Next Generation Science Standards (NGSS) — Grade 5: Structure & Properties of Matter (5-PS1), Motion & Stability (5-PS2), Energy (5-PS3), Ecosystems (5-LS1, 5-LS2), Earth Systems (5-ESS1, 5-ESS2, 5-ESS3). Public standards from nextgenscience.org.
The samples on this page are free to read in full, rationales included, with no account. The complete 100-item bank, the timed mock exams and per-chapter progress tracking are part of CoStudy on the web and in the iOS app.
Last reviewed 2026-08-22. Banks are written against the certifying body's published exam outline and re-checked when that outline changes — exams get renumbered, retired and reweighted, and a bank written to a superseded outline teaches the wrong proportions. Figures that are re-indexed annually are deliberately not asserted as rules; the questions test the governing principle instead.