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This quiz consists of 5 multiple choice and 5 short answer questions through Chapter Thirteen, Black Holes, A String/M Theory Perspective.

Multiple Choice Questions

1. Why are the fluctuations that quantum physics predicts not observable in everyday life?
(a) On large scales, the effects cancel each other out.
(b) Most fluctuations are canceled out by electromagnetic waves, like light.
(c) The fluctuations only occur in deep space.
(d) The human brain filters them out.

2. When the distance between two objects is doubled, what happens to the strength of the gravitational pull between them?
(a) It diminishes to one-fourth its original value.
(b) It diminishes to one-half its original value.
(c) It is unchanged.
(d) It quadruples.

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

4. Which of the following will occur after the collapse of the universe as predicted by string theory?
(a) The universe will become a single black hole.
(b) The universe will be mirrored in another dimension.
(c) The universe will cease to exist.
(d) The universe will expand again.

5. Who posited the existence of M-theory?
(a) Greene.
(b) Brandenberger.
(c) Plesser.
(d) Witten.

Short Answer Questions

1. Edwin Hubble used Einstein's theories to show that the fabric of the universe _____.

2. The number of family groups corresponds to a feature of the Calabi-Yau shape. What is this feature?

3. Which of the following most accurately describes the state of the universe?

4. What is entropy a measure of?

5. In Einstein's famous equation, E=mc^2, what does "c" represent?

(see the answer key)

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