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. When sodium hydroxide (NaOH) reacts with hydrochloric acid (HCl), the resulting product is:

• A. Hydrogen gas and sodium chloride (NaCl)
• B. Chlorine gas and sodium oxide (Na2O)
• C. Sodium metal (Na) and water (H2O)
• D. No reaction occurs.

Correct answer: A

Rationale: When sodium hydroxide (NaOH) reacts with hydrochloric acid (HCl), a neutralization reaction occurs. The products of this reaction are water (H2O) and a salt, which is sodium chloride (NaCl). The chemical equation for this reaction is: NaOH + HCl -> NaCl + H2O. Choice B is incorrect because chlorine gas and sodium oxide are not the products of this reaction. Choice C is incorrect as sodium metal and water are not the products formed in this neutralization reaction. Choice D is incorrect because a reaction does occur between NaOH and HCl, resulting in the formation of NaCl and H2O. Therefore, the correct answer is A: Hydrogen gas and sodium chloride (NaCl).

3. The shear number of people in the audience overwhelmed the actress as she peeked through the curtain before scene one. Which of the following correctly describes an error in the sentence above?

• A. The homograph 'peeked' should be 'peaked.'
• B. The homograph 'through' should be 'threw.'
• C. The homophone 'shear' should be 'sheer.'
• D. The homophone 'scene' should be 'seen.'

Correct answer: C

Rationale: The word 'shear' means to cut, while 'sheer' in this context means 'complete' or 'unqualified.' The correct spelling in the sentence should be 'sheer.' Choice A, 'peeked' is the correct past tense of 'peek,' meaning to glance quickly or briefly. Choice B, 'through' is the correct preposition to indicate moving in one side and out the other. Choice D, 'scene,' is the correct term for a part of a play or movie, not 'seen,' which is the past participle of 'see.'

4. Which of the following makes a correction to an error in this sentence: The family sprinted through the airport, worryed they would miss their flight?

• A. 'family' should be 'families'
• B. 'worryed' should be 'worried'
• C. 'airport' should be 'airport'
• D. 'their' should be 'there'

Correct answer: B

Rationale: The error in the sentence lies in the misspelling of 'worryed,' which should be corrected to 'worried.' This choice addresses the grammatical mistake in the sentence. Choice A ('families') is incorrect as the sentence refers to a singular 'family.' Choice C ('airport' should be 'airport') is grammatically incorrect. Choice D ('their' should be 'there') is also incorrect; 'there' is used to indicate a place, while 'their' shows possession, neither of which is the error in the original sentence.

5. What is it called when base units are combined, such as g/mL for density?

• A. combined units
• B. derived units
• C. base units
• D. calculated units

Correct answer: B

Rationale: The correct answer is B: derived units. When base units (such as grams or milliliters) are combined, as seen in g/mL (grams per milliliter) for density, they form derived units. Derived units measure complex quantities that are derived from combinations of base units. Choice A, 'combined units,' is incorrect as it does not specifically refer to the formation of new units from base units. Choice C, 'base units,' is incorrect because base units are the fundamental units from which all other units are derived, not the combinations of units. Choice D, 'calculated units,' is incorrect as it does not accurately describe the concept of combining base units to form a new unit like g/mL for density.

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