how does a double blind experiment work
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LPN Nutrition Practice Test

1. How does a double-blind experiment work?

Correct answer: B

Rationale: The correct answer is B. In a double-blind experiment, neither the subjects nor the researchers know which subjects are in the control or experimental group. This helps to eliminate bias and ensure that the results are more objective. Choice A is incorrect as in a double-blind experiment, subjects do not take turns receiving each treatment; it is about masking the treatment allocation. Choice C is incorrect because it implies that the researchers are aware of the group allocation, which goes against the principle of blinding in a double-blind study. Choice D is incorrect as both subject groups should not know whether they are in the control or experimental group to maintain the blindness of the study.

2. How should a healthcare professional manage a child with scabies?

Correct answer: A

Rationale: Corrected Rationale: Topical permethrin cream is the appropriate treatment for scabies as it effectively kills the mites causing the infestation. Oral antibiotics are not indicated for scabies as it is not a bacterial infection. Topical antifungals are used to treat fungal infections, not scabies. Providing supportive care only would not address the underlying cause of scabies, which is the mite infestation.

3. By chemical analysis, what nutrient is present in the highest amounts in most foods?

Correct answer: B

Rationale: The correct answer is B. Water is the most abundant nutrient in many foods. Water content varies across different foods, but in general, it is present in the highest amounts. Fats (Choice A) are essential but are not found in higher amounts compared to water. Proteins (Choice C) and carbohydrates (Choice D) are also important nutrients, but they are typically found in lower quantities in most foods compared to water.

4. How should a healthcare provider handle a child with a suspected head injury who is showing signs of drowsiness?

Correct answer: B

Rationale: When a child with a suspected head injury is showing signs of drowsiness, administering pain medication should not be the first course of action as it may mask important symptoms. Allowing the child to sleep is not recommended as they need to be monitored. Contacting a specialist immediately may delay necessary assessments. Performing a full neurological assessment is the most appropriate action because it helps evaluate the head injury's extent, identify neurological deficits, and guide further intervention or treatment.

5. How much energy is required to raise the temperature of one kilogram of water by 1°C?

Correct answer: C

Rationale: The correct answer is 1 kilocalorie. This is the amount of energy required to raise the temperature of 1 kilogram of water by 1°C. Choice A (10 calories) and Choice D (10 kilocalories) are incorrect as they do not represent the correct unit of measurement for this specific scenario. Choice B (100 calories) is also incorrect as it overestimates the amount of energy required. The specific heat capacity of water is approximately 1 calorie/gram °C, which means that 1 kilogram (1000 grams) of water requires 1 kilocalorie (1000 calories) to raise its temperature by 1°C.

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