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This quiz consists of 5 multiple choice and 5 short answer questions through Chapter 5, Protecting the Past.

Multiple Choice Questions

1. What can p-branes predict?
(a) The rates of emission that the molecules emit.
(b) The rates of consumption that the real-particle pair indicates.
(c) The rates of emission that the virtual-particle pair indicates.
(d) The rates of condensation that the virtual-particle trio indicates.

2. What does Hawking believe we should try to understand?
(a) The universe.
(b) Market theory.
(c) Gravitational spin.
(d) All philosophy.

3. What kind of theory do we not have yet that is essential to figuring out time travel?
(a) Quantum gravity theory.
(b) Feynmann's historical theory.
(c) Simmon's spacetime theory.
(d) Gravitational theory.

4. What did Einstein suggest concerning the speed of light?
(a) Light is independent of time.
(b) Light is dependent on motion.
(c) Light is dependent on time.
(d) Light is independent of motion.

5. What did Einstein assume about scientific laws?
(a) Laws are never fallible.
(b) Laws are always fallible.
(c) Laws should remain constant in the view of all observers.
(d) Most laws need to be rewritten.

Short Answer Questions

1. How could time travel be possible?

2. What kind of rotating Einstein universe does Hawking consider?

3. Why is it important that the sky is dark?

4. What did Einstein wish people to abandon concerning time?

5. What does the universe's real-time history determine, according to Hawking and Hartle?

(see the answer key)

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