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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. When the distance between two objects is doubled, what happens to the strength of the gravitational pull between them?
(a) It is unchanged.
(b) It diminishes to one-half its original value.
(c) It diminishes to one-fourth its original value.
(d) It quadruples.

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

3. According to general relativity, which of the following is said to warp or bend space-time?
(a) Gravity and electromagnetic fields.
(b) Accelerated motion and orbital motion.
(c) Accelerated motion and gravity.
(d) Constant, relativistic speed motion.

4. According to Newton's law of gravity, the strength of the pull between two objects depends on what factors?
(a) Their masses and potential energies.
(b) Their densities and the strength of the gravitational field they occupy.
(c) Their masses and the distance between them.
(d) The distance between them and their average atomic numbers.

5. In Einstein's famous equation, E=mc^2, what does "c" represent?
(a) The speed of light.
(b) The frequency of light.
(c) The object's density.
(d) The speed of the object.

Short Answer Questions

1. In 1968 it was discovered that protons and neutrons are composed of which type of particle?

2. Richard Feynman's "sum over paths" theory states that in the double-slit experiment, an electron behaves in what way?

3. What characteristic of the string determines the properties of the particle it represents?

4. According to Newton's theory of gravity, if two objects have a gravitational pull on one another, and one changes its mass or distance from the other, how quickly does the effect of this change travel to the other object?

5. What type of motion cannot be felt or sensed by the moving observer?

(see the answer key)

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