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Q:1-The decay constant for a radioactive material is 2.0 × 10-10 sec-1 How long would it take to reduce the activity of this material to 15 percent of its original value?
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600 years
300 years
100 years
1,000 years

Q:2-Which of the following statements BEST describes bioconcentration?
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Accumulation of substances or other organic chemicals in an organism from all sources (water, food, air, and so on)
Bioconcentration occurs when an organism absorbs a toxic substance at a rate greater than at which the substance is lost from all sources (water, food, air, and so on)
Bioconcentration refers to the uptake and accumulation of a substance from water alone
All of the above

Q:3-Workers in many different occupations are exposed to hexavalent chromium. Calcium chromate, chromium trioxide, lead chromate, strontium chromate, and zinc chromate are known human carcinogens. Which of the following types of cancer is associated with overexposure to hexavalent chromium?
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Lung cancer
Skin cancer
Stomach cancer
Colon cancer

Q:4-The coefficient of correlation for two variables is 0.95 and is significant at the 2% level. This indicates that:
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There is almost a positive linear relationship between the two variables and there is a 2% probability that the coefficient of correlation resulted from chance.
There is almost a positive linear relationship between the two variables but there is a 98% probability that the coefficient of correlation resulted from chance.
There is almost an inverse linear relationship between the two variables but there is a 2% chance that the coefficient of correlation resulted from chance.
There is almost an inverse linear relationship between the two variables but there is a 98% probability that the coefficient of correlation resulted from chance.

Q:5-If an object places stress of 50 pounds/square inch on a 10 square inch surface, what is the resulting force?
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2224 newtons
500 newtons
5 newtons
60 newtons
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Q:6-When determining the safe load on a floor, live loads indicate?
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The weight of the building and its components
Loads placed on the floor
Floor load value in a building code handbook
Load that one joist can bear

Q:7-You are using a Variable Incidence Tribometer to test the slipperiness of wet floors. Which floor is the most slip resistant?
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The floor that returns a criterion of .5
The floor that returns a criterion of .7
The floor that returns a criterion of .45
The floor that returns a criterion of .3

Q:8-How tall should a guardrail be in order to protect the greatest number of people from falling?
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45 inches
36 inches
48 inches
42 inches

Q:9-OSHA requires safety belt and lanyard hardware used in fall arresting equipment withstand a tensile load of how much?
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5400 pounds
5000 pounds
4000 pounds
4500 pounds

Q:10-According to Heinrich’s pyramid theory, for every major accident, how many minor injuries and near-miss incidents will occur?
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29 minor injuries and 300 near-miss incidents
9 minor injuries and 30 near-miss incidents
19 minor injuries and 300 near-miss incidents
29 minor injuries and 350 near-miss incidents

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