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The level of lead contamination in United States rivers

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The level of lead contamination in United States rivers [#permalink] New post 18 Oct 2005, 14:52
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A
B
C
D
E

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100% (03:35) correct 0% (00:00) wrong based on 1 sessions
15. The level of lead contamination in United States rivers declined between 1975 and 1985. Federal regulations requiring a drop in industrial discharges of lead went into effect in 1975, but the major cause of the decline was a 75 percent drop in the use of leaded gasoline between 1975 and 1985.

Which of the following, if true, best supports the claim that the major cause of the decline in the level of lead contamination in United States rives was the decline in the use of leaded gasoline?

(A) The level of lead contamination in United States rivers fell sharply in both 1975 and 1983.
(B) Most of the decline in industrial discharges of lead occurred before 1976, but the largest decline in the level of river contamination occurred between 1980 and 1985.
(C) Levels of lead contamination in rivers fell sharply in 1975-1976 and rose very slightly over the next nine years.
(D) Levels of lead contamination rose in those rivers where there was reduced river flow due to drought.
(E) Although the use of leaded gasoline declined 75 percent between 1975 and 1985, 80 percent of the decline took place in 1985.



16. George Bernard Shaw wrote: “That any sane nation, having observed that you could provide for the supply of bread by giving bakers a pecuniary interest in baking for you, should go on to give a surgeon a pecuniary interest in cutting off your leg is enough to make one despair of political humanity.â€
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 [#permalink] New post 18 Oct 2005, 14:59
15---> C
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 [#permalink] New post 18 Oct 2005, 15:28
1. B
It says that the decline in industrial discharge by 1976 did not decline lead contamination level much. After 1976, the only factor that could have contributed to the faster decline in levels is the drop in use of leaded gas.

1 A. This is a tough one. Was discussed sometime back and I believe a better explanation was given. I don't want to mess up.
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 [#permalink] New post 18 Oct 2005, 17:40
Question 1

D is the best choice. We're told that the levels of lead contaminations in
the river actually increased, so the drop must not have come from lower amount of contaminants discharged by industries
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 [#permalink] New post 18 Oct 2005, 17:44
Question 2

A is the best choice. It states that bakers are encouraged to bake financially to provide for bread does not make sense to do the same for surgeons (encourage them financially by cutting off a leg)
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Re: CR : gasoline/GBS [#permalink] New post 19 Oct 2005, 12:13
sushom101 wrote:
15. The level of lead contamination in United States rivers declined between 1975 and 1985. Federal regulations requiring a drop in industrial discharges of lead went into effect in 1975, but the major cause of the decline was a 75 percent drop in the use of leaded gasoline between 1975 and 1985.

Which of the following, if true, best supports the claim that the major cause of the decline in the level of lead contamination in United States rives was the decline in the use of leaded gasoline?

(A) The level of lead contamination in United States rivers fell sharply in both 1975 and 1983.
(B) Most of the decline in industrial discharges of lead occurred before 1976, but the largest decline in the level of river contamination occurred between 1980 and 1985.
(C) Levels of lead contamination in rivers fell sharply in 1975-1976 and rose very slightly over the next nine years.
(D) Levels of lead contamination rose in those rivers where there was reduced river flow due to drought.
(E) Although the use of leaded gasoline declined 75 percent between 1975 and 1985, 80 percent of the decline took place in 1985.


For 15 the correct answer should be B. Since the largest decline in the contamination occured after the fact that industries reduced discharges, it must be that there are some factors other than the industrial discharge regulation.

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 [#permalink] New post 19 Oct 2005, 12:55
15) OA is B...but i am still nt convinced as the 75% drop of lead gasoline is b/w 1975& 85...also that the regulation went into effect in 1975

16) is tough...i had opted for C.
OA - A
  [#permalink] 19 Oct 2005, 12:55
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