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

2. In string theory, how do strings interact?
(a) By joining and splitting.
(b) By colliding and tangling.
(c) By resonating with each other.
(d) By threading.

3. Which of the following accurately describes the phenomenon of "quantum tunneling"?
(a) Some particles are linked together, no matter how much space separates them.
(b) High-energy waves can penetrate the fabric of space-time for very short periods of time.
(c) Particles can sometimes "borrow" energy to move in ways impossible in classical physics.
(d) Particles with high energy can vanish in one location, instantly appearing in another.

4. What is supergravity?
(a) The gravitational conditions inside a black hole.
(b) The gravitational force felt at the Planck scale.
(c) The relativistic effect of two particles occupying the same location.
(d) A combination of general relativity and supersymmetry.

5. What metric best approximates the scales at which extra dimensions would have a major impact?
(a) The Planck length.
(b) The nanometer.
(c) One-billionth of a meter.
(d) The Kaluza length.

Short Answer Questions

1. How does the shape of the extra "curled up" dimensions affect the vibration of strings?

2. In M-theory, what role does duality play?

3. Kaluza-Klein theory units which two fundamental forces?

4. In M-theory, what is a two-dimensional oscillating object is called?

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

(see the answer key)

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