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This quiz consists of 5 multiple choice and 5 short answer questions through Chapter Twelve, Beyond Strings, In Search of M-Theory.

Multiple Choice Questions

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

2. Under string theory, which of the following is true regarding extra dimensions?
(a) Some or all of them might be time-dimensions.
(b) They must all be time-dimensions.
(c) They must all be space-dimensions.
(d) They must all be space-dimensions, or they must all be time-dimensions.

3. Which physicist is credited with discovering that light is composed of particles?
(a) Rutherford.
(b) Maxwell.
(c) Planck.
(d) Einstein.

4. Kaluza-Klein theory units which two fundamental forces?
(a) Electromagnetism and the weak force.
(b) Gravity and the strong force.
(c) The strong force and the weak force.
(d) Gravity and electromagnetism.

5. What metric best approximates the scales at which extra dimensions would have a major impact?
(a) The Kaluza length.
(b) The Planck length.
(c) The nanometer.
(d) One-billionth of a meter.

Short Answer Questions

1. Which of the following accurately describes the phenomenon of "quantum tunneling"?

2. How does the shape of the extra "curled up" dimensions affect the vibration of strings?

3. What does the string coupling constant govern?

4. Why are the extra dimensions needed in string theory?

5. What is a virtual string pair?

(see the answer key)

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