Correct Answer: B

Rationale: During a fire emergency, it is crucial to close all doors to contain smoke and fire, helping to protect the patients. This action can prevent the spread of fire and smoke to the area where patients are located. Identifying evacuation routes is also important for a timely and orderly evacuation if necessary. Waiting for the fire department to arrive before taking action (Choice A) can waste valuable time and put patients at risk. Moving bedridden patients in their beds (Choice D) can be dangerous during a fire and should be avoided as it can expose patients and staff to more risks.

Correct Answer: B

Rationale: Checking the patient's weight daily is the most reliable indicator of fluid status because weight changes can directly reflect fluid retention or loss. Monitoring vital signs (Choice A) can provide some information but is not as specific as weight changes. Measuring intake and output (Choice C) is crucial but may not always accurately reflect fluid balance. Monitoring urine color (Choice D) can give some insights into hydration levels, but it is not as reliable as daily weight checks for assessing overall fluid status.

Correct Answer: A

Rationale: The correct statement reflecting the principles of sterile technique is that sterile objects that come in contact with unsterile objects are considered contaminated. This principle is crucial in maintaining asepsis during medical procedures. Choice B is incorrect because items in a sterile package should only be used if they remain sterile; opening the package does not automatically contaminate the items. Choice C is incorrect as any part of a sterile field that hangs below the top of the table is considered unsterile. Choice D is incorrect as the edge of a sterile field and a border inward are typically considered unsterile to maintain the integrity of the sterile area.

Correct Answer: B

Rationale: Administering oxygen via nasal cannula as prescribed is the most appropriate action to improve the patient's oxygenation in COPD. Oxygen therapy helps maintain adequate oxygen levels in the blood, which is crucial for managing COPD. Encouraging the use of incentive spirometry, assisting with coughing and deep breathing exercises, and positioning the patient in high Fowler's position are all beneficial interventions, but administering oxygen is the priority for immediate oxygenation support in COPD.

Correct Answer: D

Rationale: The nurse should see the patient with a hip replacement experiencing chest pain and dyspnea first because these symptoms could indicate a pulmonary embolism, which is a life-threatening condition requiring immediate attention. The other patients also need care, but urgent assessment and intervention are crucial in the case of potential pulmonary embolism to prevent serious complications or death.