Nursing Elites

1. In the reaction 2H2 + O2 → 2H2O, how many moles of oxygen are required to react completely with 4 moles of hydrogen?

• A. 1
• B. 2
• C. 3
• D. 4

Correct answer: 2

Rationale: The balanced equation indicates a 1:1 ratio between H2 and O2, so 4 moles of H2 require 4 moles of O2, and 2 moles of H2 require 2 moles of O2.

2. What is the name of the bone marrow cavity in the long bones where red blood cells are produced?

• A. Periosteum
• B. Diaphysis
• C. Medullary cavity
• D. Epiphysis

Correct answer: B

Rationale: The correct answer is B: Diaphysis. The diaphysis is the shaft of a long bone where the medullary cavity is located. The medullary cavity is the central cavity of the diaphysis where red bone marrow is found and is responsible for producing red blood cells, white blood cells, and platelets. The periosteum is a dense membrane covering the outer surface of bones, not where red blood cells are produced. The epiphysis refers to the ends of long bones, while the medullary cavity is found in the diaphysis. Therefore, the correct choice is the diaphysis where the medullary cavity is located for red blood cell production.

3. Identify the conjunction in the following sentence: He went to the store, but they were already closed.

• A. went
• B. to
• C. but
• D. they

Correct answer: C

Rationale: Conjunctions connect words, phrases, or clauses. "But" joins two contrasting ideas in the sentence.

4. What is the scientific term for the windpipe, a tube that carries air from the larynx to the bronchi?

• A. Pharynx
• B. Trachea
• C. Epiglottis
• D. Bronchiole

Correct answer: B

Rationale: The correct answer is B: Trachea. The trachea is the scientific term for the windpipe, which is a tube that carries air from the larynx to the bronchi. The pharynx is the throat area where the mouth and nasal passages meet. The epiglottis is a flap of tissue that covers the trachea during swallowing to prevent food from entering the airway. Bronchioles are smaller airway branches in the lungs. Therefore, the trachea best fits the description of a tube carrying air from the larynx to the bronchi.

5. Which property describes a substance's resistance to flow?

• A. Density
• B. Viscosity
• C. Conductivity
• D. Reactivity

Correct answer: b

Rationale: Viscosity refers to a substance's resistance to flow. Substances with high viscosity flow slowly, while those with low viscosity flow more easily.

6. What is the relationship between work and kinetic energy?

• A. Work is the cause of kinetic energy
• B. Kinetic energy is the cause of work
• C. Work and kinetic energy are the same
• D. Work and kinetic energy are unrelated

Correct answer: a

Rationale: Work done on an object can change its kinetic energy, either increasing or decreasing it.

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