Correct Answer: B

Rationale: The correct first step in managing a child with a suspected head injury is to assess the child's level of consciousness. This assessment is crucial as it helps determine the severity of the injury and guides further management. Administering pain medication (Choice A) should not be done before assessing the level of consciousness. Performing a CT scan (Choice C) may be necessary but is not the initial step. Monitoring for seizures (Choice D) is important but comes after assessing the child's level of consciousness.

Correct Answer: B

Rationale: Randomization is crucial in a scientific experiment to eliminate bias in the assignment of subjects to groups. By randomly assigning subjects, it helps ensure that any differences observed in the outcomes are due to the experimental treatment and not to preexisting differences between groups. Choice A is incorrect because randomization does not guarantee representativeness but rather minimizes the impact of confounding variables. Choice C is not entirely accurate; while randomization can contribute to accuracy and validity, its primary purpose is to reduce bias. Choice D is incorrect as the goal of randomization is not to balance the number of subjects but to prevent systematic differences between groups.

Correct Answer: B

Rationale: The correct first step in managing a child with a suspected head injury is to assess the child's level of consciousness. This assessment is crucial as it helps determine the severity of the injury and guides further management. Administering pain medication (Choice A) should not be done before assessing the level of consciousness. Performing a CT scan (Choice C) may be necessary but is not the initial step. Monitoring for seizures (Choice D) is important but comes after assessing the child's level of consciousness.

Correct Answer: A

Rationale: To assess hydration status in a child with fever and vomiting, monitoring skin turgor and mucous membranes is essential. Skin turgor refers to the skin's ability to change shape and return to normal; poor skin turgor can indicate dehydration. Mucous membranes, such as the mouth and eyes, can also provide valuable information about hydration levels. Measuring blood glucose levels (Choice B) is not directly related to assessing hydration status. Checking for signs of jaundice (Choice C) is important for liver-related issues, not hydration assessment. Assessing respiratory rate (Choice D) is crucial for evaluating respiratory function, not hydration status.

Correct Answer: A

Rationale: The correct answer is fats. Fats provide 9 kilocalories per gram, which is more energy-dense compared to proteins and carbohydrates. While proteins and carbohydrates provide 4 kilocalories per gram, fats provide more than twice the energy, making them the most energy-providing nutrient. Alcohols are not considered essential nutrients and do not provide energy for the body, unlike fats, proteins, and carbohydrates. Therefore, fats are the correct answer for the most energy-providing nutrient.