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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. What is the Planck tension?
(a) The pull between strings at the Planck length.
(b) The attraction felt by a string through the strong force.
(c) The typical tension in a string.
(d) The vacuum-energy of a matter and anti-matter string pair.

2. The discovery of the tearing of space-time came from cooperation between experts in physics and _____.
(a) Engineering.
(b) Astronomy.
(c) Cosmology.
(d) Mathematics.

3. Which of the following is true regarding the force of gravity in string theory?
(a) Gravity in string theory acts over much longer distances.
(b) String theory predicts gravity.
(c) Gravity in string theory is stronger than what we actually observe.
(d) Gravity is not addressed in string theory.

4. In 1968 it was discovered that protons and neutrons are composed of which type of particle?
(a) Muons.
(b) Baryons.
(c) Quarks.
(d) Neutrinos.

5. 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 unrelated masses, and their spins differ by 1.
(c) They have the same mass and spin.
(d) They have the same mass, and their spins differ by 1/2.

Short Answer Questions

1. Who first proposed the existence of extra dimensions?

2. What distinction does dark matter have?

3. Which of the following best describes a wormhole?

4. What metric best approximates the scales at which extra dimensions would have a major impact?

5. Regarding mirror-symmetry, Greene's work proved that _____.

(see the answer key)

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