Correct Answer: C

Rationale: A satisfactory radial pulse can typically be taken starting at around 3 years of age, as younger children often have pulses that are too fast and irregular for accurate measurement.

Correct Answer: C

Rationale: The oral mucosa and conjunctivae are the best places to observe petechiae in dark-skinned individuals because these areas have less pigmentation.

Correct Answer: A

Rationale: The correct dosage to administer 20 mg is 0.4 mL, calculated by dividing the dose (20 mg) by the concentration (100 mg in 2 mL). This calculation ensures the accurate administration of the prescribed medication. Choices B, C, and D are incorrect as they do not reflect the correct calculation based on the provided concentration of the medication.

Correct Answer: B

Rationale: Adolescents may withdraw from social interactions, worry about the impact of the divorce, and express strong emotions such as anger or sadness.

Correct Answer: C

Rationale: The FACES Pain Rating Scale is suitable for children as young as 3 years of age. It uses facial expressions to depict different levels of pain, making it easy for young children to understand and use. The Poker Chip Tool is validated for children aged 4 and older who have a certain level of cognitive ability. The Visual Analog Scale is more appropriate for children aged 7 and above. The Word-Graphic Rating Scale, which uses descriptive words, is recommended for children in the age range of 4 to 17 years.