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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 mass?
(a) The average mass gained by a string when it changes to a higher-frequency pattern.
(b) The typical energy of a quark.
(c) The typical mass of a vibrating string.
(d) The typical mass created by quantum foam over one nano-second.

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

3. Why are the extra dimensions needed in string theory?
(a) To prevent the negative and infinite answers to its physical equations.
(b) To remove time from its equations.
(c) To provide more space for strings.
(d) To account for the infinite-energy problem.

4. What is the quantum, or messenger particle, of the weak force?
(a) The Higgs boson.
(b) The weak gauge boson.
(c) The neutrino.
(d) The up quark.

5. Which of the following correctly describes the structure of an atom?
(a) A single nucleus composed of both electrons and protons.
(b) A cloud of neutrons orbiting a nucleus of other particles.
(c) A cloud of protons, each with an electron orbiting it.
(d) A cloud of electrons orbiting a dense nucleus.

Short Answer Questions

1. How many dimensions did the tiny objects involved in the original statement of string theory have?

2. When a black hole's entropy increases, which of its characteristics increases as well?

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

4. What is the shape of all particles, at the smallest possible level, according to string theory?

5. Which of the following is one of the major problems in using both quantum physics and general relativity?

(see the answer key)

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