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# The Elegant Universe: Superstrings, Hidden Dimensions, and the Quest For… Test | Final Test - Easy

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This test consists of 15 multiple choice questions and 5 short answer questions.

## Multiple Choice Questions

1. Kaluza's theory suggested that electromagnetism was carried by ripples in _____.
(a) The "curled up" dimensions.
(b) The three normal space dimensions.
(c) The time-dimension only.
(d) All dimensions of both space and time.

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

3. It is believed that early on, the universe experienced symmetry breaking, meaning that _____.
(a) Quantum fluctuations caused different expanding areas to have different energy densities.
(b) Three of the space dimensions expanded asymmetrically compared to the others.
(c) The universe expanded very rapidly for a short time.
(d) The three non-gravitational forces were separated out.

4. How many total dimensions are required by string theory?
(a) Seven.
(b) Eight.
(c) Ten.
(d) Five.

5. How does the number of extra "curled up" dimensions affect the vibration of strings?
(a) String vibration is not affected by additional dimensions.
(b) More dimensions require more energy for the same vibrational pattern.
(c) More dimensions allow for string with length in more than one direction.
(d) More dimensions provide more ways to vibrate.

6. According to modern physics, which of the following may cease to exist at the center of a black hole?
(a) Strings.
(b) Energy.
(c) Time.
(d) Space.

7. What does the string coupling constant govern?
(a) The likelihood of strings joining or separating.
(b) The strength of links between strings.
(c) The relative length of threading between strings.
(d) The number of strings that can be joined at once.

8. What distinction does dark matter have?
(a) It is composed of anti-matter.
(b) It exists in curled-up dimensions.
(c) It can spontaneously form black holes.
(d) It does not give off light.

9. Who first proposed the existence of extra dimensions?
(a) Hawking.
(b) Kaluza.
(c) Maxwell.
(d) Einstein.

10. What is the scientific state of the "multiverse" theory?
(a) It was discarded years ago.
(b) It is well accepted by the physics community.
(c) It is accepted by almost all young physicists, but almost no older ones.
(d) It is on the fringes of physics.

11. In M-theory, what is a two-dimensional oscillating object is called?
(a) A two-string.
(b) A flop.
(c) A membrane.
(d) A blob.

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

13. When a Calabi-Yau space collapses, it comes back as a space. What distinction does it have?
(a) It has mirror-symmetry with its old shape.
(b) It has one fewer dimensions.
(c) It has no shielding against tears in space-time.
(d) It has one less hole.

14. Which one of the following do physicists believe occurs at the central point of a black hole?
(a) A "white hole" is formed.
(b) An infinite-time flop-transition occurs.
(c) Space-time becomes inverted.
(d) Space-time is torn.

15. What property does an external black hole have?
(b) The maximum possible mass for its charge and spin.
(c) The maximum possible internal temperature.
(d) The minimum possible mass for its charge and spin.

1. In ratios of what number do winding energies come?

2. Who posited the existence of M-theory?

3. String theory claims that super particles _____.

4. What is one possible way that the three dimensions we observe could have been "stretched out"?

5. Which of the following is true regarding experimental evidence for super particles?