3rd GRADE 1st 6 WEEKS SCIENCE TEST PDF | PDF | Melting Point ... - Free Printable

Let's go through each question on the 3rd Grade, 1st 6 Weeks Science Test and solve them step by step with explanations.

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Question 1:

Liquids and gases take the shape of their containers. Which of the following will take the shape of its container?

A a crayon in a backpack
B a bike wheel in a box
C a cookie in a jar
D milk in a carton

✔ Correct Answer: D – milk in a carton

Explanation:
Liquids (like milk) do not have a fixed shape; they take the shape of the container they are in. Solids (crayon, bike wheel, cookie) keep their own shape regardless of the container. Milk is a liquid, so it will flow and take the shape of the carton.

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Question 2:

There are three buckets each containing different materials. The answer choices below list the contents of each of the buckets. Which is a mixture?

A bucket #1: gravel, sand, salt
B bucket #2: paper clips, tacks, nails
C bucket #3: rice, peas, beans
D All are mixtures.

✔ Correct Answer: D – All are mixtures

Explanation:
A mixture is made up of two or more substances that are physically combined but not chemically bonded. Each bucket contains multiple different materials:
- Bucket #1: gravel, sand, salt → all different substances
- Bucket #2: paper clips, tacks, nails → all different objects/materials
- Bucket #3: rice, peas, beans → different types of food items

All of these are combinations of distinct materials, so all are mixtures.

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Question 3:

Mrs. Parson’s class was asked to bring items from home to see which would sink or float. Which is a list of the items that all sink?

A metal spoon, steel nail, glass marble
B plastic spoon, plastic duck, steel nail
C glass marble, plastic straw, metal spoon
D steel nail, Styrofoam cup, glass marble

✔ Correct Answer: A – metal spoon, steel nail, glass marble

Explanation:
To sink, an object must be denser than water. Let's analyze each item:

- Metal spoon: denser than water → sinks ✔
- Steel nail: very dense → sinks ✔
- Glass marble: dense → sinks ✔

Now check other options:
- Plastic spoon and plastic duck: typically float (less dense) ✘
- Plastic straw: floats ✘
- Styrofoam cup: very light, floats ✘

So only Option A has all items that sink.

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Question 4:

To show you that it is possible to separate mixtures, your teacher gave you a mixture of sand and iron filings. Then she had you wave a piece of metal over the mixture, and the iron filings jumped onto the piece of metal from the mixture. From this, you can say that the metal filings have what physical property?

A smell
B magnetism
C ability to float
D ability to sink

✔ Correct Answer: B – magnetism

Explanation:
The fact that the iron filings were attracted to the piece of metal (likely a magnet) shows that they have magnetism as a physical property. This is how we can separate iron filings from sand — because iron is magnetic and sand is not.

Other options:
- Smell: not relevant here
- Ability to float/sink: not demonstrated in this experiment
- So magnetism is the correct physical property shown.

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✔ Final Answers:

1. D – milk in a carton
2. D – All are mixtures
3. A – metal spoon, steel nail, glass marble
4. B – magnetism

Let me know if you'd like this formatted for a student answer sheet!