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This quiz consists of 5 multiple choice and 5 short answer questions through Chapter Ten, Quantum Geometry.

Multiple Choice Questions

1. Which of the following is true regarding the amount of visible matter in the universe compared to the amount of matter required to cause collapse of the universe?
(a) There is much more of it than is needed to cause collapse.
(b) It makes up a very small percentage of the mass needed.
(c) It almost exactly equals the mass needed.
(d) It makes up about half the mass needed.

2. Which of the following best describes the fate of Kaluza-Klein theory?
(a) It became the mathematical basis of general relativity.
(b) It was updated through the 1970s, and eventually incorporated into string theory.
(c) It became widespread for a short time, but receives almost no attention now.
(d) It was quickly discarded as meaningless, but rediscovered by string theory.

3. According to Newton's theory of gravity, if two objects have a gravitational pull on one another, and one changes its mass or distance from the other, how quickly does the effect of this change travel to the other object?
(a) At exactly the speed of light.
(b) Near the speed of light, faster for more massive objects.
(c) Instantaneously.
(d) Near the speed of light, faster for lighter objects.

4. Which of the following qualities must a physical law have in order to be considered symmetric?
(a) It is valid for both matter and anti-matter.
(b) It does not depend on where or when it is applied.
(c) It works regardless of the spin of the particles involved.
(d) It is valid for both matter and energy.

5. Why can the objects predicted by string theory not be observed?
(a) Current magnification is at least 17 times too wide.
(b) The objects are not composed of matter.
(c) The objects exist only in other dimensions.
(d) Light does not exist at the scales involved.

Short Answer Questions

1. Which of the following is true regarding the force of gravity in string theory?

2. Kaluza-Klein theory units which two fundamental forces?

3. What metric best approximates the scales at which extra dimensions would have a major impact?

4. What shape allows for the vibrational patterns that we observe in our universe?

5. What is the quantum, or messenger particle, of the weak force?

(see the answer key)

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