The Ambu bag with reservoir gives oxygen concentration:

Correct Answer: C

Rationale: When used with a reservoir, the Ambu bag delivers nearly 100% oxygen, essential for emergency resuscitation.

Correct Answer: C

Rationale: Achondroplasia is a genetic disorder caused by a mutation in the FGFR3 gene, not a chromosomal abnormality. Prader-Willi syndrome, X-linked hydrocephalus, and Treacher Collins syndrome are chromosomal or genetic disorders.

Correct Answer: C

Rationale: Dilute artificial formula can cause total body sodium depletion, leading to hyponatremia due to excessive water intake without adequate sodium replacement.

Correct Answer: D

Rationale: Nebulized adrenaline is commonly used in croup to reduce airway edema, improving airflow and reducing respiratory distress.

Correct Answer: D

Rationale: The encircling technique provides effective chest compressions in infants and children. It involves using both thumbs while the hands encircle the chest, ensuring better compression depth and recoil.