Science online exercise for 5th Grade - Free Printable

Let's go through each question on the worksheet and solve them step by step with explanations.

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1. Matter that changes size to fill its container is a _____.

Options:
a) Gas
b) Liquid
c) Mass
d) Solid

Answer: a) Gas

Explanation:
Gases have no fixed shape or volume. They expand to fill the entire volume of their container. Liquids take the shape of the container but do not change their volume significantly. Solids maintain both shape and volume. "Mass" is not a state of matter. So, the correct answer is Gas.

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2. Which of the following is a metric unit of measurement?

Options:
a) Centimeter
b) Liquid
c) Gas
d) Solid

Answer: a) Centimeter

Explanation:
Centimeter (cm) is a metric unit used to measure length. The other options—liquid, gas, and solid—are states of matter, not units of measurement. Therefore, centimeter is the only correct choice.

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3. Which of the following is an element?

Options:
a) Gold
b) Silver
c) Water
d) Copper

Answer: All of the above (a, b, and d) — BUT since it’s multiple choice with single selection, let’s analyze:

- Gold (Au) → Element ✔
- Silver (Ag) → Element ✔
- Water (H₂O) → Compound (not an element) ✘
- Copper (Cu) → Element ✔

So, gold, silver, and copper are elements. But if you must pick one, the best answer would be any of a, b, or d. However, since this is likely designed for one choice, and all three metals are correct, but water is not, we need to see which one is listed as correct.

But since the format allows only one choice, and all three metals are elements, any of a, b, or d could be correct. However, if only one option is allowed, then the safest answer is:

✔ a) Gold — because it is clearly an element.

But actually, this question has a flaw — multiple correct answers. If it's a single-select question, it should list only one correct option. But based on standard expectations, gold, silver, and copper are all elements.

However, assuming the test expects one answer, and all three metals are valid, we can say:
✔ Any of a, b, or d — but since only one can be selected, a) Gold is acceptable.

But wait — let's look again: Water is not an element, so c is wrong.

So among the choices, a, b, and d are all elements.

But if only one answer is allowed, perhaps the intended answer is a) Gold, or maybe it's a trick to test knowledge.

Actually, in many such tests, multiple elements are listed, and the student is expected to recognize that gold, silver, and copper are elements, while water is not.

But since it says “which of the following,” and lists four options, and only one can be chosen, the best way is to select one that is definitely correct.

So, a) Gold is correct.
b) Silver is also correct.
d) Copper is also correct.

But if only one answer is allowed, and the test expects one, then any of a, b, or d is fine.

But since the question asks “which of the following,” implying one, and all three metals are correct, this might be a poorly designed question.

But for the sake of answering, let's assume the expected answer is a) Gold — a common example.

Alternatively, if the question allows multiple correct answers, but format doesn't, then it's ambiguous.

But in reality, gold, silver, and copper are all elements.

So, correct answers: a, b, d
Incorrect: c (water is a compound)

But since only one choice is allowed, and all three metals are valid, the most likely intended answer is:

✔ a) Gold

(Or possibly the question has a typo.)

But let’s move on.

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4. A wooden boat floats better than a metal boat because it has less _______.

Options:
a) Volume
b) Area
c) Perimeter
d) Density

Answer: d) Density

Explanation:
Floating depends on density. Objects float when their density is less than the fluid they're in (like water). Wood is less dense than metal, so a wooden boat floats better. Even though a metal boat may be heavier, it can still float if shaped properly (like a steel ship), but generally, wood is lighter and less dense.

So, the key factor is density.

✔ Answer: d) Density

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5. How many centimeters are in a meter?

Options:
a) 100
b) 10
c) 1
d) 1,000

Answer: a) 100

Explanation:
The metric system defines:
- 1 meter = 100 centimeters
- 1 kilometer = 1,000 meters
- 1 centimeter = 0.01 meters

So, 100 centimeters in a meter.

✔ Answer: a) 100

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✔ Final Answers:

1. a) Gas
2. a) Centimeter
3. a) Gold (or b or d — but a is acceptable)
*(Note: This question has multiple correct answers; gold, silver, and copper are all elements. Water is not.)*
4. d) Density
5. a) 100

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If the test requires only one answer per question, here’s the best possible set:

> 1. a) Gas
> 2. a) Centimeter
> 3. a) Gold (or b or d — but a is safe)
> 4. d) Density
> 5. a) 100

Let me know if you want a version with all correct answers highlighted!