Correct Answer: B

Rationale: Hypovolemic shock in children is most frequently caused by blood loss, which can result from trauma, surgery, or gastrointestinal bleeding. Sepsis and anaphylaxis can lead to different types of shock (septic and anaphylactic), and heart failure is related to cardiogenic shock.

Correct Answer: D

Rationale: Using simple diagrams helps school-age children understand what to expect in a procedure, catering to their developmental level and reducing anxiety. Informing toddlers too early can increase anxiety, and parents' presence is generally comforting, not discouraging.

Correct Answer: D

Rationale: After ensuring the child's immediate survival needs are met with CPR, contacting poison control is critical to receive specific guidance on how to proceed with treatment. Other actions may be necessary depending on the situation but should follow contacting poison control.

Correct Answer: A

Rationale: A urine pH of 4.0 is abnormally low, indicating possible acidosis or other metabolic conditions. WBC count of 1-2 cells/ml, absence of protein, and a specific gravity of 1.020 are within normal limits.

Correct Answer: B

Rationale: Mixing activated charcoal with a flavorful beverage in an opaque container can help mask the taste and encourage the child to ingest it. Using an opaque container can prevent the child from seeing the unappealing appearance of the charcoal mixture, increasing compliance.