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This quiz consists of 5 multiple choice and 5 short answer questions through Chapters 21-25.

Multiple Choice Questions

1. How many watts per square food does overhead sunlight approximately deliver to the ground?
(a) 50.
(b) 200.
(c) 75.
(d) 100.

2. How much bomb-grade uranium or plutonium would be needed to make a weapon in the kiloton range?
(a) 15 pounds.
(b) 10 pounds.
(c) 20 pounds.
(d) 5 pounds.

3. If refrigerators still needed to use as many kilowatt-hours as in 1974, how many new gigawatt power plants would have had to be provided?
(a) 42.
(b) 31.
(c) 19.
(d) 23.

4. How much of the atmosphere is made up of carbon dioxide?
(a) 1%.
(b) 0.579%.
(c) 2%.
(d) 0.038%.

5. How long were the steel columns of the World Trade Center designed to maintain their strength during an ordinary fire?
(a) 6 hours.
(b) 2 to 3 hours.
(c) 4 to 5 hours.
(d) 1 hour.

Short Answer Questions

1. How many Chernobyl thyroid cancer victims died?

2. When did the U.S. pass a law mandating the use of 7.5 billion gallons of ethanol by 2012?

3. When did scientists use satellites called GRACE to measure changes in Antarctic ice from 2002 to 2005?

4. When did the author spend a night with the U.S. Border Patrol?

5. What prize did Richard Branson offer to anyone who came up with a practical way to remove the carbon dioxide from the atmosphere?

(see the answer key)

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