Characteristic physical signs of pneumothorax include:

Correct Answer: B

Rationale: In pneumothorax, air accumulation causes lung collapse, shifting the mediastinum to the opposite side. Decreased breath sounds, hyperresonance on percussion, and absent fremitus are typical findings.

Correct Answer: B

Rationale: Somatoform disorders involve physical symptoms without a clear medical explanation. Asthma has a clear physiological basis and is not considered a somatoform disorder.

Correct Answer: C

Rationale: The apt test is specifically used to differentiate between fetal and maternal blood in cases of swallowed blood syndrome or suspected neonatal bleeding. Hemorrhagic disease of the newborn is diagnosed differently, often through clinical presentation and vitamin K levels.

Correct Answer: D

Rationale: Foods are not a common cause of allergic conjunctivitis, which is typically triggered by airborne allergens.

Correct Answer: A

Rationale: Obstructive shock results from physical blockage of blood flow, such as cardiac tamponade or pulmonary embolism, impairing ventricular output.