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This quiz consists of 5 multiple choice and 5 short answer questions through Chapter 9 The Arrow of Time.

Multiple Choice Questions

1. How many black holes are estimated per cubic light year of space?
(a) 350.
(b) 300.
(c) 400.
(d) 450.

2. What is the purpose of an arrow of time?
(a) To give direction to time.
(b) To indicate how much time has passed.
(c) To indicate how fast time moves.
(d) To indicate how far time must move.

3. Philosophers try to understand the universe using what method?
(a) Mathematics.
(b) Disciplined logic.
(c) Circular arguments.
(d) Religious reasoning.

4. What is one thing particles do when they enter a black hole?
(a) Cause the emission of other particles.
(b) Stop emitting light.
(c) Become destroyed.
(d) Become very dense.

5. Scientists try to create explanations for the way the universe works that always do what?
(a) Are simple and easy to understand.
(b) Are developed in think tanks.
(c) Are complex.
(d) Work mathematically.

Short Answer Questions

1. There are at least how many different arrows of time?

2. Most people believe that since the universe had a beginning it must have a what?

3. Using low level radiation to detect black holes is in what stage of research?

4. What type of theories try to bring the various virtual particles together as one entity, but do not include gravity?

5. Who created the idea that a star can collapse and become a black hole?

(see the answer key)

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