Nursing Elites

1. Why can optical fibers transmit light signals around bends?

• A. Reflection
• B. Refraction
• C. Diffraction
• D. Polarization

Correct answer: B

Rationale: Optical fibers can transmit light signals around bends primarily due to refraction. Refraction is the bending of light as it passes from one medium to another, such as from air to glass in an optical fiber. This bending allows the light signals to travel through the fiber even around bends, making optical fibers an efficient means of transmitting light signals over long distances. Reflection (Choice A) occurs when light bounces off a surface, which is not the primary mechanism allowing light to travel around bends in optical fibers. Diffraction (Choice C) refers to the bending of light waves around obstacles or openings, but it is not the main reason light signals can traverse bends in optical fibers. Polarization (Choice D) is the orientation of light waves in a specific plane, but it does not play a significant role in enabling light to navigate bends in optical fibers.

2. What is the network of vessels and ducts responsible for draining excess fluid and waste products from tissues?

• A. Circulatory system
• B. Digestive system
• C. Lymphatic system
• D. Respiratory system

Correct answer: C

Rationale: The correct answer is the Lymphatic system (option C). The lymphatic system is responsible for draining excess fluid and waste products from tissues. It works alongside the circulatory system to maintain fluid balance in the body. The circulatory system (option A) transports blood, the digestive system (option B) processes food, absorbs nutrients, and eliminates solid waste, while the respiratory system (option D) is responsible for gas exchange, specifically the intake of oxygen and removal of carbon dioxide.

3. Why are elements in Group 18 (Noble gases) generally unreactive?

• A. They have high atomic masses
• B. They lack valence electrons
• C. Their outermost electron shells are completely filled
• D. They exist as single atoms, not molecules

Correct answer: C

Rationale: Elements in Group 18 (Noble gases) are generally unreactive because their outermost electron shells are completely filled. This results in high stability and low reactivity since they have achieved a full valence shell configuration, making them less likely to gain, lose, or share electrons with other atoms. The full valence shell configuration leads to a minimal tendency for these elements to form chemical bonds, hence exhibiting low reactivity. Choices A, B, and D are incorrect because high atomic masses, lack of valence electrons, and existing as single atoms do not directly contribute to the unreactivity of noble gases. It is the full valence shell configuration that is the primary reason for their inert nature.

4. Which sentence demonstrates correct use of the apostrophe?

• A. The dog wagged its tail.
• B. It's a wonderful day.
• C. The dog's tail wagged.
• D. It's a big house.

Correct answer: C

Rationale: Choice C, 'The dog's tail wagged,' is the correct use of the apostrophe to show possession. In this sentence, the apostrophe is used correctly to indicate that the tail belongs to the dog. Choice A is incorrect as 'it's' is a contraction of 'it is' or 'it has,' not possessive. Choice B is also incorrect as 'Its' should be 'It's' to mean 'It is' or 'It has.' Choice D is incorrect as 'Its'' is grammatically incorrect; the correct form would be 'It's' if it were a contraction or 'Its' if it indicated possession without an apostrophe.

5. Which of the following is not a reliable resource for a research paper?

• A. The New York Times
• B. A personal interview with a politician
• C. A medical journal
• D. Wikipedia

Correct answer: D

Rationale: Wikipedia is not a reliable source for a research paper due to its open editing format, which may lead to inaccuracies, bias, and lack of authority. While it can be a good starting point for research and general information, it is crucial to verify information from Wikipedia with more academic and reputable sources like peer-reviewed journals, books, or official websites. The New York Times, a personal interview with a politician, and a medical journal are generally considered reliable sources for research papers. The New York Times is a reputable newspaper, personal interviews can provide valuable firsthand insights, and medical journals undergo rigorous peer review processes to ensure accuracy and reliability.

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