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This quiz consists of 5 multiple choice and 5 short answer questions through Chapter 6, Nothing but Music, The Essentials of Superstring Theory.

Multiple Choice Questions

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

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

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

4. Which of the following is not one of the four fundamental forces of the universe?
(a) The photoelectric force.
(b) Gravity.
(c) The electromagnetic force.
(d) The nuclear-weak force.

5. Which of the following did Einstein considered time?
(a) The fifth fundamental force of the universe.
(b) A fourth dimension, alongside the three spatial dimensions.
(c) A three-dimensional field.
(d) A physical substance, composed of particles.

Short Answer Questions

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

2. What is the fundamental force responsible for keeping the nucleus of an atom "glued" together?

3. Which of the following accurately describes the phenomenon of "quantum tunneling"?

4. Why are the fluctuations that quantum physics predicts not observable in everyday life?

5. What does the quantum electroweak theory state about the two fundamental forces it describes?

(see the answer key)

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