Ontario Grade 9 Science Class Practice Exam

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Master Grade 9 Science with our comprehensive practice exam. Test your knowledge, identify weak areas, and boost your confidence for academic success.

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What is an astronomical unit?

The average speed of light
The average distance between Earth and the sun, about 150 million kilometers
The distance between the Earth and the Moon
The unit of time it takes for Earth to orbit the Sun

The correct answer is: The average distance between Earth and the sun, about 150 million kilometers

An astronomical unit is defined as the average distance between Earth and the sun, which is equivalent to approximately 150 million kilometers. This unit of measurement is used to measure distances within our solar system, and it is not related to the speed of light (A), the distance between Earth and the Moon (C), or the unit of time it takes for Earth to orbit the Sun (D). Therefore, B is the most fitting answer.