Nursing Elites

1. What is the primary purpose of control rods within a nuclear reactor?

• A. Reflecting neutrons back into the core
• B. Absorbing excess neutrons to control criticality
• C. Moderating the velocity of neutrons
• D. All of the above

Correct answer: B

Rationale: The primary purpose of control rods in a nuclear reactor is to absorb excess neutrons to control criticality. When inserted into the reactor core, control rods absorb neutrons, reducing the number available for sustaining the fission chain reaction. This action allows operators to manage the reactor power levels and prevent overheating or runaway reactions. Reflecting neutrons back into the core and moderating neutron velocity are not the primary functions of control rods in a nuclear reactor. Choice A is incorrect because control rods do not reflect neutrons back into the core but absorb them. Choice C is incorrect as the moderation of neutron velocity is typically achieved by other materials like a moderator (e.g., water, graphite) rather than control rods. Choice D is incorrect as control rods do not reflect neutrons or moderate neutron velocity, making it an incorrect option.

2. The teacher shared several apothegms with the class, hoping that the short, wise sayings would inspire thoughtful discussions.

• A. instructions
• B. questions
• C. sayings
• D. lectures

Correct answer: C

Rationale: In this context, apothegms refers to short, wise sayings meant to convey wisdom or provoke thought. Apothegms are concise and insightful, serving as nuggets of wisdom. The term 'instructions' implies a set of directions or guidelines, not reflective of the nature of apothegms. 'Questions' are queries seeking information or answers, not synonymous with wise sayings. 'Lectures' are formal presentations or speeches, which are more extensive and detailed compared to the concise nature of apothegms.

3. What is one way the author specifies that a person can try to be aware of their consumption of water and energy?

• A. Food that remains on your plate is a wasted resource, and you can always go back for a second helping.
• B. Locally grown food and other products manufactured within your community are the best choices.
• C. Don’t leave appliances or chargers plugged in when not in use.
• D. Participation begins with our everyday choices.

Correct answer: C

Rationale: The correct answer is C. The author specifically mentions in the passage that individuals should unplug appliances and chargers when not in use to reduce energy consumption. Choices A, B, and D are incorrect because they do not directly address the action of being aware of water and energy consumption. Choice A discusses food waste, choice B focuses on sustainable products and locally grown food, and choice D talks about participation in general without focusing on energy or water consumption.

4. Which of the following is the MOST common symptom of angina pectoris, a condition related to insufficient blood flow to the heart?

• A. Fever and chills.
• B. Chest pain or discomfort.
• C. Sudden onset of severe shortness of breath.
• D. Numbness or tingling in the extremities.

Correct answer: B

Rationale: Chest pain or discomfort is the most common symptom of angina pectoris. This pain is often described as squeezing, pressure, heaviness, tightness, or pain in the chest. Fever and chills, sudden onset of severe shortness of breath, and numbness or tingling in the extremities are not typical symptoms of angina pectoris. The pain associated with angina is usually triggered by physical or emotional stress and typically subsides with rest or medication, distinguishing it from other conditions.

5. In the cardiovascular system, what does the term 'double circulation' refer to?

• A. The separation of oxygenated and deoxygenated blood flow within the heart.
• B. The regulation of blood pressure through vasoconstriction and vasodilation.
• C. The cyclic contraction and relaxation of the heart muscle.
• D. The existence of two separate circulatory pathways, one for the lungs and one for the body.

Correct answer: D

Rationale: The term 'double circulation' in the cardiovascular system refers to the existence of two separate circulatory pathways, one for the lungs (pulmonary circulation) and one for the body (systemic circulation). Oxygen-poor blood is pumped from the heart to the lungs for oxygenation, and then oxygen-rich blood is pumped from the lungs back to the heart to be circulated to the rest of the body. Choices A, B, and C are incorrect as they do not accurately describe the concept of 'double circulation.' Choice A refers to the separation of oxygenated and deoxygenated blood within the heart, choice B relates to blood pressure regulation mechanisms, and choice C describes the cardiac muscle's contraction and relaxation, none of which define 'double circulation' in the context of the cardiovascular system.

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