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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. Which of the following is true about the tension within a string?
(a) It is very high, more than a billion tons.
(b) It has no bearing on a string's energy.
(c) It is very low, less than a few pounds.
(d) It cannot be said truly to exist.

2. According to Newton's law of gravity, the strength of the pull between two objects depends on what factors?
(a) The distance between them and their average atomic numbers.
(b) Their densities and the strength of the gravitational field they occupy.
(c) Their masses and the distance between them.
(d) Their masses and potential energies.

3. According to string theory, which of the following cannot occur during the collapse of the universe?
(a) It cannot exert gravitational pull greater than the Planck tension.
(b) It cannot lose energy.
(c) It cannot collapse into one of the extra dimensions.
(d) It cannot be reduced to a size smaller than the Planck length.

4. Which of the following is true regarding the mass and spin of a pair of superpartners?
(a) Their masses and spins are not related.
(b) They have the same mass, and their spins differ by 1/2.
(c) They have unrelated masses, and their spins differ by 1.
(d) They have the same mass and spin.

5. Which of the following is NOT a property that is used to define both black holes and elementary particles?
(a) Force charge.
(b) Half-life.
(c) Mass.
(d) Spin.

Short Answer Questions

1. What property of both black holes and elementary particles is still unknown?

2. What is different about a particle of antimatter, compared to its normal counterpart?

3. The smallest possible unit of energy is referred to as _____.

4. Which of the following is closest to the Planck length?

5. What property did the double-slit experiment demonstrate that light has?

(see the answer key)

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