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This quiz consists of 5 multiple choice and 5 short answer questions through Part 4, Chapter 13.

Multiple Choice Questions

1. Today, scientists know that radiation in high doses is:
(a) Healthy.
(b) Safe.
(c) Toxic.
(d) Tolerable.

2. Our universe is at least how many light-years wide?
(a) 5 trillion.
(b) 100 billion.
(c) 50 million trillions.
(d) 350 trillion.

3. Arranged side by side, how many atoms can fit across the width of a typical human hair?
(a) Five thousand.
(b) Half a trillion.
(c) Five hundred.
(d) Half a million.

4. According to the author, humans today have 625 percent more what in their bloodstream compared to previous generations?
(a) Pesticides.
(b) Lead.
(c) Alcohol.
(d) Chlorofluorocarbons.

5. When radiation was first discovered, people thought it must have:
(a) An extraterrestrial origin.
(b) High toxicity.
(c) Been caused by thunderstorms.
(d) Healthful properties.

Short Answer Questions

1. According to the Reverend William Buckland, the biblical reference to "in the beginning" with regards to the formation of Earth could refer to:

2. In 2003, NASA came up with an estimated age of the universe. What was it?

3. The fact that Pluto has a moon was not discovered until:

4. Which of the following is NOT a quark "flavor?"

5. About how many stars are visible to the naked eye from Earth?

(see the answer key)

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