Nursing Elites

1. Which sound waves have a higher pitch?

• A. Those waves that are closer together
• B. Those waves that are farther apart
• C. Those waves that travel a long distance
• D. Those waves that travel a short distance

Correct answer: A

Rationale: Sound waves that are closer together have a higher pitch. This is explained by the Doppler Effect, where as a source of sound moves closer to an observer, the waves are compressed, resulting in a higher frequency and a higher pitch. Conversely, when the source moves away, the waves are stretched, leading to a lower frequency and a lower pitch. Therefore, choice A is correct. Choices B, C, and D are incorrect as they do not accurately describe the relationship between sound wave frequency and pitch.

2. What does the author suggest about the Earth's tilt in the passage on Daylight Savings Time?

• A. The Earth's tilt has no effect on the seasons.
• B. The Earth's tilt affects the amount of sunlight different areas receive.
• C. The Earth's tilt is constant throughout the year.
• D. The Earth's tilt changes dramatically during the seasons.

Correct answer: B

Rationale: The author suggests that the Earth's tilt affects the amount of sunlight different areas receive, influencing the seasons. The passage explains how the tilt of the Earth towards the sun results in different regions receiving varying amounts of sunlight, leading to the existence of seasons. This tilt causes regions near the equator to receive more sunlight consistently, while the Poles experience periods of constant darkness or sunlight, creating different seasons. Choices A, C, and D are incorrect because the passage clearly states that the Earth's tilt influences sunlight distribution and subsequently impacts the seasons.

3. Based on this passage, what can the reader infer about the advice physicians will give their pregnant patients about coffee consumption?

• A. Almost all of them will advise women to stop drinking any caffeine until after the baby is born.
• B. The majority will ignore the study altogether and continue to advise caffeine in moderation as before.
• C. All of them will demand additional research be done before they change what they tell their patients.
• D. Some will continue to make their normal recommendations about caffeine, while others will be more cautious than before.

Correct answer: D

Rationale: The passage implies that there is variability in physician responses to the study about caffeine consumption. Some doctors may continue their standard recommendations, while others might advise more caution based on the new evidence. Therefore, option D reflects this variability in professional opinions and is the correct inference.

4. What is a major difference in the way baroreceptors and chemoreceptors work from the way the kidneys work?

• A. Baroreceptors and chemoreceptors send impulses from the arteries, while the kidneys control blood volume.
• B. Baroreceptors and chemoreceptors both work to help maintain blood volume, whereas the kidneys take care of salts, water, and waste removal.
• C. Baroreceptors and chemoreceptors must work together to control blood pressure, whereas the kidneys work with the adrenal cortex.
• D. Baroreceptors and chemoreceptors are both located near the adrenal cortex, whereas the kidneys are located near the heart.

Correct answer: A

Rationale: The correct answer is A. Baroreceptors and chemoreceptors send impulses from the arteries, while the kidneys control blood volume. Baroreceptors and chemoreceptors are responsible for monitoring blood pressure by sensing changes in pressure, oxygen levels, carbon dioxide levels, and pH within the arteries. They send out impulses to raise or lower blood pressure accordingly. On the other hand, the kidneys play a crucial role in regulating blood volume by absorbing salts and water and removing waste products. This key difference highlights that while baroreceptors and chemoreceptors are involved in monitoring and regulating blood pressure, the kidneys primarily focus on controlling blood volume. Choice B is incorrect because it inaccurately states that baroreceptors and chemoreceptors help maintain blood volume, which is not their primary function. Choice C is incorrect as it provides an inaccurate comparison between the roles of baroreceptors, chemoreceptors, and the kidneys. Choice D is incorrect as it wrongly associates the location of baroreceptors and chemoreceptors with the adrenal cortex, which is not accurate.

5. What is the main idea of the passage about Toxins and Your Health?

• A. Environmental toxins may have dire health effects over time.
• B. Of three toxins studied, lead has the worst effect on health.
• C. Toxins may accumulate in the bones of older patients.
• D. Johns Hopkins University has discovered a new use for lead.

Correct answer: A

Rationale: The passage emphasizes the long-term effects of environmental toxins such as lead, pesticides, and mercury on brain health, particularly as individuals age. Dr. Brian Schwartz's quote highlights the link between environmental exposure and cognitive decline, framing the entire discussion around the potential health ramifications of such exposure over time. This clearly aligns with choice A, making it the main idea of the passage.

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