Grade 3 science test - strong and stable structures - Free Printable

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Science Test: Strong and Stable Structures

#### Part One: Multiple Choice – Circle the correct answer

1. All structures have...
A) a definite shape, size and purpose
B) windows and doors
C) a roof
D) to be built by humans

2. Examples of man-made structures include:
A) a bird's nest, a beaver dam, and a beehive
B) a cave, and a field
C) bridges, shopping malls, and skyscrapers
D) flowers and clouds

3. Examples of natural structures include:
A) a bird's nest, a beaver dam, and a beehive
B) a drinking glass and a basketball
C) bridges, shopping malls, and skyscrapers
D) flowers and clouds

4. The stability of a structure is:
A) its ability to hold a load
B) its ability to stay balanced and in place
C) the place where it was made
D) who made it

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✔ Let's Solve Each Question:

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1. All structures have...
✔ Correct Answer: A) a definite shape, size and purpose

- Explanation: A structure is something that has a defined form (shape and size) and serves a specific function (purpose). While some structures may have roofs or windows, not all do. And not all are built by humans (e.g., beehives are natural). So the most accurate and universal definition is A.

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2. Examples of man-made structures include:
✔ Correct Answer: C) bridges, shopping malls, and skyscrapers

- Explanation: Man-made structures are created by humans for specific uses.
- Bridges, shopping malls, skyscrapers → all human-built.
- Bird’s nest, beaver dam, beehive → natural (not man-made).
- Cave and field → natural features.
- Flowers and clouds → natural phenomena.

So C is the only option with all man-made examples.

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3. Examples of natural structures include:
✔ Correct Answer: A) a bird's nest, a beaver dam, and a beehive

- Explanation: Natural structures are formed without human intervention, often by animals or nature.
- Bird’s nest, beaver dam, beehive → built by animals → natural structures.
- Drinking glass, basketball → human-made.
- Bridges, shopping malls, skyscrapers → man-made.
- Flowers and clouds → natural, but they aren't typically classified as "structures" in this context because they don’t have a functional, engineered design.

While D (flowers and clouds) are natural, they’re not *structures* in the same way nests or dams are. So A is best.

> Note: This question depends on interpretation. But in science education, “natural structures” usually refer to things like animal homes, shells, etc.

So A is the best choice.

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4. The stability of a structure is:
✔ Correct Answer: B) its ability to stay balanced and in place

- Explanation: Stability refers to how well a structure resists movement or collapse under forces (like wind, weight, or gravity). It's about balance and resistance to tipping or falling over.
- A) Holding a load → relates more to strength.
- C) Where it was made → irrelevant.
- D) Who made it → irrelevant.
- B) Staying balanced and in place → this is the definition of stability.

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✔ Final Answers:

1. A
2. C
3. A
4. B

Let me know if you'd like explanations tailored for students, or if there are additional parts to the test!