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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. Hawking used what kind of space-time to reach the conclusion that the universe is similar to a sphere?
(a) Euclidean.
(b) Ptolemaic.
(c) Aristotelian.
(d) Newtonian.

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

3. To illustrate the concept of disorder in a system, Hawking uses what example in Chapter 9?
(a) A car crash.
(b) A broken vase.
(c) A bag of marbles.
(d) A jigsaw puzzle.

4. What travels at the speed of 186,000 miles per second?
(a) Electrons.
(b) Light.
(c) Sound.
(d) Waves.

5. In the universe, objects move in what type of direction?
(a) In circular motions.
(b) In curved lines.
(c) In waves.
(d) In straight lines.

Short Answer Questions

1. Who proposed the elliptical orbits of the planets?

2. All the particles in the universe are what type of spin?

3. Some particles might match up with their anti-particles at what point?

4. What scientific feat led to the introduction of imaginary time?

5. What is the second law of thermodynamics?

(see the answer key)

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