Ontario Grade 9 Science Class Practice Exam 2025 – Your Complete Guide to Exam Success!

Question: 1 / 400

What does the orbital radius refer to?

The smallest unit of an element.

A cloud of gas and dust in space.

The average distance between the sun and an orbiting object.

Orbital radius refers to the average distance between the sun and an orbiting object. Options A and D are incorrect because they refer to elements, not distances. Option B is incorrect because it refers to a cloud of gas and dust, not a specific distance. Additionally, not all orbiting objects are surrounded by a cloud of gas and dust. Thus, the correct answer is C.

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An element in Group 1 of the periodic table.

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