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This quiz consists of 5 multiple choice and 5 short answer questions through Chapter Twelve, Beyond Strings, In Search of M-Theory.

Multiple Choice Questions

1. Quantum chromodynamics concerns quantum mechanics and ____.
(a) The weak force.
(b) The electromagnetic force.
(c) Gravity.
(d) The strong force.

2. What prevents the potentially dangerous effects of an exposed tear in space-time?
(a) Tears are shielded by strings.
(b) Tears are quickly mended by the force of gravity.
(c) Tears only widen to about the Planck length.
(d) Tears occur in curled-up dimensions.

3. What does the string coupling constant govern?
(a) The likelihood of strings joining or separating.
(b) The strength of links between strings.
(c) The relative length of threading between strings.
(d) The number of strings that can be joined at once.

4. What discovery about string theory triggered the "superstring revolution"?
(a) Its approximate equations were solved for the first time.
(b) It was found to encompass the four fundamental forces of matter.
(c) Einstein announced that it exactly matched his formulas for general relativity.
(d) It was experimentally confirmed at Fermilab in the US.

5. How does the shape of the extra "curled up" dimensions affect the vibration of strings?
(a) Only the total energy of the vibration is affected.
(b) Only the wavelength of the vibration is affected.
(c) The shape determines what types of vibrations are possible.
(d) The shape does not affect the vibrational patterns.

Short Answer Questions

1. Which of the following is true regarding the mass and spin of a pair of superpartners?

2. How are the amplitude of a string's vibration and the mass of the particle it represents related?

3. What is the quantum, or messenger particle, of the weak force?

4. Who provided the computer programming to process the results of the Morrison-Greene experiment?

5. What spin do all particles of matter have?

(see the answer key)

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