Ontario Grade 9 Science Class Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

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!

Practice this question and more.

What is a black hole?

A region in space where gravity pulls so much that even light cannot get out
A new galaxy forming
The end of the universe
The collapse of a large star

The correct answer is: A region in space where gravity pulls so much that even light cannot get out

A black hole is a region in space where gravity is extremely strong due to the concentration of matter in a small space. This causes the region to have such a strong gravitational pull that even light cannot escape, hence the term "black hole". Option B is incorrect because black holes do not form new galaxies, they can only be found within existing galaxies. Option C is incorrect because while the concept of a black hole may lead to speculation about the end of the universe, it is not the definitive end. Option D is incorrect because, while the collapse of a large star may lead to the creation of a black hole, it is not the only means by which a black hole can form.