1. 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) Light does not exist at the scales involved.
(d) The objects exist only in other dimensions.

2. What does the quantum electroweak theory state about the two fundamental forces it describes?
(a) In four-dimensional space, they are the same thing.
(b) At extreme energy and temperature conditions, they become the same thing.
(c) They are identical at quantum scales.
(d) They only interact at the Planck length and below.

3. According to special relativity, which of the following is true about the passage of time for an observer moving near the speed of light?
(a) No time would pass at all.
(b) Time would pass slowly compared to an observer at rest.
(c) Time would pass very quickly compared to an observer at rest.
(d) The passage of time could not be predicted.

4. Which of the following is NOT an actual version of string theory?
(a) Fermionic type IV theory.
(b) Heterotic type O(32) theory.
(c) Type IIA theory.
(d) Type I theory.

5. Which of the following theory was NOT developed in order to try to resolve the conflicts between quantum mechanics and general relativity?
(a) Superstring theory.
(b) Quantum field theory.
(c) Quantum electrodynamics.
(d) Inflationary theory.

Short Answer Questions

1. If a clock were accelerated to nearly the speed of light for a year's time, which of the following would be true of its reading at the end of that time?

2. Which of the following is true of a particle's spin?

3. Which of the following did Einstein considered time?

4. The wave-like nature of the electron means that after a collision, _____.

5. Which of the following methods has been used to determine the shape of the Calabi-Yau space?

(see the answer key)

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