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- 1. Multiple Choice
If an incandescent light bulb used for lighting has an efficiency rating of 5 percent, then for every 1.00 joules of electrical energy consumed by the bulb, which of the following is produced? (Energy)
1.05 joules of light energy
1.05 joules of heat energy
0.95 joules of light energy
0.05 joule of light energy
0.05 joule of heat energy
- 2. Multiple Choice
A sample of radioactive waste has a half-life of 10 years and an activity level of 2 curies. After how many years will the activity level of this sample be 0.125 curie? (Half-life)
10 years
20 years
30 years
40 years
80 years
- 3. Multiple Choice
If a city of population 10,000 experiences 100 births, 40 deaths, 10 immigrants and 30 emigrants in the course of a year, what is the net annual percentage growth rate? (population)
0.4%
0.8%
1.0%
4.0%
8.0%
- 4. Multiple Choice
The current global human population is about 6.1 billion and is growing at an annual rate of 1.35 percent. If world population were to grow at that rate for the next year, approximately how many people would be added? (population)
8 x 105
8 x 106
8 x 107
8 x 108
8 x 109
- 5. Multiple Choice
If the population of a country grows at a rate of approximately 5 percent per year, the number of years required for the population to double is closest to (population)
5 years
10 years
15 years
25 years
35 years
- 6. Multiple Choice
For a certain insecticide, the LD-50 dosage level for rats is determined to be 250 milligrams per kilogram of body mass. On the basis of this information, which of the following is the best prediction regarding the consequences of receiving this dosage of the insecticide? (Toxicology)
Fifty percent of any rat population would be sickened.
Fifty percent of the population of any warm-blooded animal would die.
Fifty percent of any population of mosquitoes would die.
Five hundred out of every one thousand people would experience acute effects
Five hundred out of every one thousand rats would die.
- 7. Multiple Choice
The combustion of one gallon of automobile fuel produces about 5 pounds of carbon (in CO2). Two autos are making a trip of 600 miles. The first auto gets 20 miles per gallon and the second gets 30 miles per gallon. Approximately how much less carbon (in CO2) will be produced by the second auto on this trip? (Resources)
300 lbs
150 lbs
100 lbs
75 lbs
50 lbs
- 8. Multiple Choice
If the annual consumption of petroleum in the United States is about 23 barrels per capita, the total annual consumption of petroleum in the United States is closest to (Resources) Hint: What is the approximate population of the US?
12 million barrels
240 barrels
2 billion barrals
6 billion barrels
10 billion barrels
- 9. Multiple Choice
Uranium-235 has a half-life of 710 million years. If it is determined that a certain amount of stored U-235 will be considered safe only when its radioactivity has dropped to 0.10 percent of the original level, approximately how much time must the U-235 be stored securely to be safe? (Half-life) Hint: Make your life easier...move some decimals!
7.1 x 106 years
7.1 x 107 years
7.1 x 108 years
7.1 x 109 years
7.1 x 1010 years
- 10. Multiple Choice
Th world's population in 2000 was approximately 6 billion. Assuming a constant growth rate of 2 %, in what year would the world' population reach 12 billion? (population)
2035
2050
2070
2100
4000
- 11. Multiple Choice
Plutonium-239 has a half life of 24,000 years. How much of a 1 gram sample will remain after 96,000 years? (Half-life)
1 gram
0.5 grams
0.25 grams
0.125 grams
0.062 grams
- 12. Multiple Choice
In the community described in the table, which of the following represents the respiratory energy (kcal/m2/year) used by autotrophic organisms? (Energy flow)
10
200
1600
2000
10000
- 13. Multiple Choice
Based on the table, calculate the efficiency of energy transfer in percent for (Energy flow)
-producers to primary consumers
-primary consumers to secondary consumers
-secondary consumers to tertiary consumers
6%, 1.3%, 0.8%
16.7%, 1.3%, 10%
16.7%, 8.0% , 10%
16.7%, 8.0% , 0.8%
12.5%, 10%, 16.7%
- 14. Multiple Choice
A population with a crude birth rate of 46 and a crude death rate of 12 is growing at what annual percentage rate? (Population)
5.8
3.4
58
34
25
- 15. Multiple Choice
A population has a crude birth rate of 46 and a crude death rate a 11. How many years will it take for this population to double? (Population)
17
20
35
57
200
- 16. Multiple Choice
I-131 has a half life of about 8 days. if an original sample weights 240kg, how many kg will remain after 32 days? (Half-life)
15
30
45
60
120
- 17. Multiple Choice
In the earth's crust the temperature increases about 2oC for each 100m depth below the surface. If the surface temperature if 30oC, a temperature of 100oC can be reached at a depth of
7 km
500 m
35 km
100 km
3.5 km
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