12th Grade Open Covers Quizzes , Questions & Answers

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12th Grade

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Now it’s time to apply. In this quiz, you’ll solve problems that require reasoning with open covers. Take this quiz to test your compactness skills.

Questions: 15 | Attempts: 12 | Last updated: Jan 21, 2026

Sample Question 1
Compactness means:

Set is open

Every open cover has a finite subcover

Set is finite

Set is infinite

Sample Question 2
[0,1] is compact because it is closed and bounded.

True

False

Understanding Open Covers

Covers and subsets can feel abstract. In this quiz, you’ll get comfortable identifying open covers and their role in compactness. Take this quiz to build foundational intuition.

Questions: 15 | Attempts: 12 | Last updated: Jan 21, 2026

Sample Question 1
An open cover of a set is:

A collection of subsets containing the set exactly

A collection of open sets whose union contains the set

A partition of the set

The complement of the set

Sample Question 2
Which is an open cover of [0,1]?

{(−1,0.5), (0.5,2) }

{[0,0.5], [0.5,1] }

{ {0}, {1} }

{ (−∞,0], [1,∞) }

12th Grade Open Covers Quizzes , Questions & Answers

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