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 the Big Bang Theory?

The theory that the universe is infinite
A theory that states the universe does not expand
The theory that the universe originated 20 billion years ago from an explosion of a small mass of matter
A theory about the future collision of galaxies

The correct answer is: The theory that the universe originated 20 billion years ago from an explosion of a small mass of matter

The Big Bang Theory is a scientific explanation for the origin and evolution of the universe. It states that approximately 13.8 billion years ago, the universe started as a singularity and then rapidly expanded, resulting in the formation of all known matter and energy. This expansion continues today. Option A is incorrect because the Big Bang Theory does not propose an infinite universe, but rather an expanding one. Option B is incorrect because it goes against the widely accepted evidence and observations that support the Big Bang Theory. Option D is incorrect because the Big Bang Theory focuses on the early stages of the universe, not on future events.