Correct Answer: A

Rationale: Physiologic manifestations of pain may vary considerably, so they do not provide a consistent measure of pain. Heart rate may increase or decrease. The same signs that may suggest fear, anxiety, or anger also indicate pain. In chronic pain, the body adapts, and these signs decrease or stabilize. Physiologic measurements are of limited value and must be viewed in the context of a pain rating scale, behavioral assessment, and parental report. When the child reports pain on an appropriate pain scale, the appropriate interventions should be used. Therefore, physiologic measurements are not considered a reliable standalone indicator for pain in children, making choice A the correct answer. Choice B is incorrect because physiologic measurements alone do not serve as the best indicator of pain. Choice C is incorrect as physiologic measurements are still limited even when children report pain. Choice D is incorrect as physiologic measurements are not primarily used to determine the truthfulness of a child's pain report.

Correct Answer: D

Rationale: The correct answer is D: 'Before meals'. Chest physiotherapy should be performed before meals to reduce the risk of vomiting and to ensure that the airways are clear for effective nutrition. Choices A, B, and C are incorrect because chest physiotherapy is ideally done before meals to optimize its benefits and avoid complications associated with timing.

Correct Answer: C

Rationale: The correct principle to guide the nurse when teaching a discipline class for parents of pre-schoolers is that discipline is meant to teach and gradually shift control from parents to the child, promoting self-discipline. This approach focuses on educating children on appropriate behavior rather than solely relying on punishment. Choice A is incorrect because using the strictest punishment is not the most effective method for discipline. Choice B is incorrect because punishment can reinforce unwanted behavior if not used appropriately. Choice D is incorrect because discipline and punishment are not synonymous; discipline involves a broader aspect of teaching and guiding behavior.

Correct Answer: B

Rationale: Daily weight is the most accurate measure of fluid balance in children with acute glomerulonephritis, as it reflects changes in body fluid status more reliably than other measures like proteinuria or specific gravity.

Correct Answer: B

Rationale: Marking the point of measurement ensures consistent and accurate assessments of abdominal circumference, especially important in conditions like bowel obstruction where changes need to be monitored closely.