Until the Apollo astronauts brought samples of lunar material to Eart

Question

‎ ‎ ‎ ‎ ‎ Until the Apollo astronauts brought samples of lunar material to Earth during 1969-72, scientists believed that the Moon's surface was largely undisturbed, given its dry, airless environment. Examination of the samples has shown otherwise. Micrometeorites, many smaller than a pencil point, constantly rain onto the Moon at up to 100,000 kilometers per hour, chipping materials or forming microscopic craters. Some melt the soil and vaporize and recondense as glassy coats on other specks of dust. Impacts weld debris into lumps of heterogeneous matter called "agglutinates." Complicated interactions with solar particle streams convert iron into myriads of microscopic iron grains. The regolith-pebbles, sand, and dust- from these erosion processes blankets the Moon. Much of the top layer consists of a complex abrasive dust of microscopic glass shards that can grind machinery and sealing devices and damage human lungs.

‎ ‎ ‎ ‎ The Apollo specimens held by the United States are doled out in ultra-small samples to scientists who demonstrate that nothing else will suffice for high-value experiments. Renewed interest in lunar exploration in the late 1980s meant that materials designed to simulate lunar regolith-simulants -were needed for research to develop schemes for lunar building and procedures for extracting elements such as oxygen found abundantly in regolith. That led to the development of JSC-1 in 1993, made of volcanic cinder cone from a quarry in Arizona in the U.S. The more than 22 metric tons made was in high demand. Efforts are now afoot to manufacture 16 metric tons of JSC-1A, with 1 ton of fine grains, 14 tons of moderately fine, and 1 ton of coarse.

‎ ‎ ‎ ‎ Currently, three new simulants are being developed. Two will represent the Moon's dry seas region and polar highlands region. A third will represent the glassy, jagged edges of lunar dust that test the best of hardware and humans. But since matching every lunar location would require large numbers of small, unique, expensive batches, the intention is to develop a few "root simulants," blends of which will yield regionally specific simulants. For example, ilmenite, a crystalline iron-titanium oxide, is a crucial ingredient for the new dry seas region simulant. Raw materials for the three new stimulants will come from sites in the U.S. and even some international sites
   1 
1. The information in the passage most strongly supports which of the following claims about the samples of lunar material brought back from the Moon by the Apollo astronauts?

A. Scientists for whose experiments JSC-1A would suffice are not regarded as entitled to obtain material from the samples.
B. Only scientists working on the development of simulants of lunar regolith have access to the samples.
C. The samples were of all the major types of lunar regolith.
D. The samples' ingredients included some cinder cone from lunar volcanoes.
E. Only one of the samples contained ilmenite.

2 
2. It can be most reasonably inferred from the passage that if robots were used instead of humans to explore the Moon, then

A. lunar soil could be analyzed without returning it to Earth
B. lunar exploration would be no less expensive than lunar exploration by humans
C. simulants of lunar regolith would not be needed in order to prepare for the lunar missions
D. those robots would function well only if they were engineered to resist certain characteristics of lunar regolith
E. solar particle streams would not pose less of a problem for robotic exploration than they pose for human exploration

3 
3. Which of the following most accurately describes the primary purpose of the passage?

A. To set out in detail a scientific hypothesis and provide evidence for it
B. To report and set in context a research and development program
C. To explore the major challenges confronting an innovative project
D. To propose a solution to a major problem encountered by a scientific program
E. To show how a long accepted scientific viewpoint has changed

4 
4. According to the passage, which of the following statements about lunar regolith simulants is true?

A. Each of them contains an ingredient unique to it.
B. Not all the raw materials for them are to be obtained from mines and quarries located in the United States.
C. Most of them contain very small amounts of materials brought back from the Moon.
D. They are not in every case designed to have approximately the same chemical composition as lunar regolith itself.
E. The main ingredient for most of them is volcanic cinder cone.

Sajjad1994 · Answer

Explanation

2. It can be most reasonably inferred from the passage that if robots were used instead of humans to explore the Moon, then

Explanation

The passage discusses the examination of lunar samples brought back by Apollo astronauts. It doesn't explicitly mention whether robots could analyze lunar soil without returning it to Earth. However, it does indicate that examination of lunar material has provided valuable insights into the Moon's surface characteristics.

The passage mentions the development of simulants of lunar regolith to prepare for lunar missions. It implies that there is a significant cost associated with preparing for lunar exploration, especially in terms of developing materials to simulate lunar conditions.
 
 The passage discusses the need for simulants of lunar regolith to develop schemes for lunar building and procedures for extracting elements. It also mentions the complex abrasive dust on the Moon's surface that can damage machinery and sealing devices. This implies that robots exploring the Moon would need to be engineered to resist the characteristics of lunar regolith.
 
 The passage mentions complicated interactions with solar particle streams that convert iron into microscopic grains. This implies that solar particle streams pose a challenge for lunar exploration, both for humans and robots.

Based on this,  (D)  is correct.  (D)  is supported by the passage's discussion of the need for simulants to prepare for lunar missions and the mention of the abrasive nature of lunar dust that can damage machinery. It's reasonable to assume that robots would need to be specifically engineered to withstand the challenges posed by the lunar environment, including the characteristics of lunar regolith.

A.  This option cannot be inferred.

B.  The passage implies that there are significant costs associated with lunar exploration, but it doesn't compare the costs of human vs. robotic exploration.

C.  The passage clearly discusses the development of simulants of lunar regolith, suggesting their necessity for preparing for lunar missions.

E.  The passage mentions the complicated interactions with solar particle streams but does not directly compare the impact of these streams on human vs. robotic exploration.

Answer: D

Sajjad1994 · Answer

Explanation

3. Which of the following most accurately describes the primary purpose of the passage?

Explanation

A.  is incorrect because the passage does not revolve around presenting a specific scientific hypothesis and providing evidence to support it. Instead, it discusses various findings related to lunar exploration, including the discovery of new information about the Moon's surface and subsequent developments in lunar research and development.

B.   accurately describes the primary purpose of the passage. The passage provides information about the need for simulants to simulate lunar regolith, the development of these simulants (such as JSC-1), and ongoing efforts to develop new simulants representing different lunar regions. It sets this research and development program in context by explaining the background of lunar exploration and the renewed interest in lunar exploration in the late 1980s.

C.  While the passage does mention challenges related to matching every lunar location with simulants, this is not the primary focus. The passage discusses a broader range of topics, including the need for simulants, their development, and their applications, rather than focusing solely on exploring challenges.

D.  is incorrect because the passage does not propose a solution to a specific problem encountered by a scientific program. While it discusses the development of simulants to simulate lunar regolith, it does not frame this as a solution to a problem but rather as a response to the need for materials to simulate lunar conditions.

E.  Although the passage does indeed demonstrate a shift in a long-accepted scientific viewpoint about the Moon's surface, this is not the primary purpose of the passage. The primary focus is on reporting and setting in context a research and development program related to lunar exploration, specifically the development of simulants to simulate lunar regolith.

Answer: B

Sajjad1994 · Answer

Explanation

4. According to the passage, which of the following statements about lunar regolith simulants is true?

Explanation

A.  While the passage mentions the development of regionally specific simulants by blending  "root simulants,"  it does not state that each simulant contains a unique ingredient. It discusses the use of specific ingredients, such as ilmenite for the new dry seas region simulant, but it does not suggest that these ingredients are unique to each simulant.

B.   The passage clearly states that raw materials for the new simulants will come from sites in the U.S. and some international sites. Therefore, not all raw materials are sourced solely from the United States, supporting option B.

C.  The passage does not specify whether these materials are used in the production of lunar regolith simulants. Therefore, it cannot be concluded that most simulants contain materials brought back from the Moon.

D.  This is aslo incorrect.

E.  While the passage mentions the development of JSC-1 using volcanic cinder cone from a quarry in Arizona, it does not indicate that volcanic cinder cone is the main ingredient for most lunar regolith simulants. Instead, it mentions the intention to develop regionally specific simulants with unique ingredients, such as ilmenite for the dry seas region simulant.

Answer: B

Sajjad1994 · Answer

Explanation

1. The information in the passage most strongly supports which of the following claims about the samples of lunar material brought back from the Moon by the Apollo astronauts?

Explanation

A.   The passage mentions that ultra-small samples of Apollo specimens are doled out to scientists who demonstrate that nothing else will suffice for high-value experiments. This implies that only scientists whose experiments require materials not provided by JSC-1A or other simulants would be eligible to obtain material from the Apollo samples.

B.  While the passage discusses the development of lunar regolith simulants using materials from the Apollo specimens, it does not imply that only scientists working on simulant development have access to the samples.

C.  While the passage describes various components of lunar regolith, it does not explicitly state whether the samples brought back by the Apollo astronauts represented all the major types of lunar regolith.

D.  The passage mentions that JSC-1, a simulant developed in 1993, was made of volcanic cinder cone from a quarry in Arizona, not from lunar volcanoes.

E.  While the passage mentions ilmenite as a crucial ingredient for one of the new lunar regolith simulants, it does not specify whether only one of the samples contained ilmenite.

Answer: A

KarishmaB · Answer

Here is the video discussing this passage and all four questions:

https://www.youtube.com/watch?v=oCPQKtEpEI0

Until the Apollo astronauts brought samples of lunar material to Eart

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Until the Apollo astronauts brought samples of lunar material to Eart