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.

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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How far does light travel in a year?

The distance it takes to reach the moon
The distance from Earth to the Sun
The distance light travels in a year
The circumference of the Earth

The correct answer is: The distance light travels in a year

Light travels at a constant speed of approximately 186,282 miles per second, which equates to about 5.88 trillion miles in a year. This is significantly greater than the distance to the moon (approximately 238,855 miles) or the circumference of the Earth (approximately 24,901 miles). While the distance from Earth to the Sun (approximately 93 million miles) may seem like a long distance, it is only a fraction of the distance light travels in a year. Therefore, the correct answer is C, the distance light travels in a year.