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02 Aug 2024, 01:31
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
72% (01:42) correct
28%
(01:56)
wrong
based on 253
sessions
History
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Not Attempted Yet
Hydrogen is widely touted as the energy source of the future. But making hydrogen requires fuel, which otherwise could be used to generate electricity, heat, or mechanical power directly. To run our hybrid cars and light our homes, for example, we can generate electricity in small, efficient plants fueled by natural gas. Consuming natural gas to produce hydrogen, which is then converted into electricity, lowers overall efficiency and increases the emission of harmful greenhouse gases into the environment.
The passage is structured to lead to which of the following conclusions?
(A) Natural gas is the most efficient source of energy and should be used instead of hydrogen for this purpose.
(B) To reduce greenhouse gas emissions, we should drive hybrid cars because they are powered partly by electricity.
(C) Generating hydrogen is prohibitively expensive to be worthwhile as a way to provide for our energy needs.
(D) Using hydrogen as an energy source is not the most environmentally sound means of meeting our energy needs.
(E) Producing hydrogen requires the consumption of fuels such as natural gas, which are in too short supply to accommodate our energy needs.
The passage is structured to lead to which of the following conclusions?
(A) Natural gas is the most efficient source of energy and should be used instead of hydrogen for this purpose.
(B) To reduce greenhouse gas emissions, we should drive hybrid cars because they are powered partly by electricity.
(C) Generating hydrogen is prohibitively expensive to be worthwhile as a way to provide for our energy needs.
(D) Using hydrogen as an energy source is not the most environmentally sound means of meeting our energy needs.
(E) Producing hydrogen requires the consumption of fuels such as natural gas, which are in too short supply to accommodate our energy needs.
02 Aug 2024, 08:16
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This is a "what is the conclusion" question. The premise is that even though hydrogen is a powerful source of energy, hydrogen requires fuel to make, fuel that could otherwise be used in other industries. The passage then gives an example of how using natural gas to convert into hydrogen and then electricity, while it powers our homes and electric cars, causes environmental damages.
From this summary, it seems like what the passage is concluding is that making hydrogen energy isn't worth the side effects.
Looking at the answer choices:
A) While the passage says that converting natural gas to hydrogen and electricity causes lower efficiency, there's nothing in the passage suggesting which energy source is the MOST efficient energy source. Answer choices that use absolutes are usually wrong (not always though)
B) This is the opposite of what the passage says, it says that converting natural gas to hydrogen and electricity (which is then used by the hybrid cars) is what actually CAUSES increases in greenhouse gas emissions.
C) There is no mention about price points at any given point in the passage, irrelevant.
D) This matches our originally drawn conclusion, since at the end the passage even says that natural gas to hydrogen to electricity conversion leads to an increase in harmful greenhouse gas emissions.
E) The first part of this answer choice is correct, however, where it goes wrong is in stating that it's too short in supply, because there is no mention of supply anywhere in the passage. Irrelevant.
Answer choice D is correct.
From this summary, it seems like what the passage is concluding is that making hydrogen energy isn't worth the side effects.
Looking at the answer choices:
A) While the passage says that converting natural gas to hydrogen and electricity causes lower efficiency, there's nothing in the passage suggesting which energy source is the MOST efficient energy source. Answer choices that use absolutes are usually wrong (not always though)
B) This is the opposite of what the passage says, it says that converting natural gas to hydrogen and electricity (which is then used by the hybrid cars) is what actually CAUSES increases in greenhouse gas emissions.
C) There is no mention about price points at any given point in the passage, irrelevant.
D) This matches our originally drawn conclusion, since at the end the passage even says that natural gas to hydrogen to electricity conversion leads to an increase in harmful greenhouse gas emissions.
E) The first part of this answer choice is correct, however, where it goes wrong is in stating that it's too short in supply, because there is no mention of supply anywhere in the passage. Irrelevant.
Answer choice D is correct.
01 Sep 2024, 04:00
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OFFICIAL EXPLANATION
The correct answer is (D).
The passage points out that producing electricity from hydrogen results in the emission of a greater amount of greenhouse gases (which is harmful to the environment) than producing electricity directly from natural gas. Based on this premise, the former method is not as environmentally sound as the latter method.
