Correct Answer: C

Rationale: The correct answer is C: Spoon nails. In iron-deficiency anemia, the nails may develop a concave or spoon-like shape (koilonychia). This is due to the decreased oxygen supply to the nail bed. The characteristic spoon nails are indicative of severe iron deficiency. Splinter hemorrhages (choice A) are small areas of bleeding under the nails and are more commonly associated with conditions like endocarditis. Paronychia (choice B) is an infection around the nail, not specific to anemia. Beau's lines (choice D) are horizontal depressions in the nails, typically seen after a period of severe illness or stress, rather than specifically in iron-deficiency anemia.

Correct Answer: B

Rationale: The correct answer is B because people of African descent commonly have a pigmented layer near the outer canthus of the lower lid called the "plica semilunaris." This is a normal anatomical variation in this population. Yellow fatty deposits over the cornea (choice A) are not typical findings in this demographic. Yellow color of the sclera extending up to the iris (choice C) is not a characteristic feature. The presence of small brown macules on the sclera (choice D) is also not a common finding in individuals of African descent.

Correct Answer: C

Rationale: Step 1: Down's syndrome is associated with characteristic physical features. Step 2: One common physical feature is a protruding tongue due to a small oral cavity. Step 3: This is known as macroglossia and is seen in individuals with Down's syndrome. Step 4: Therefore, the nurse looks for a protruding thin tongue in children with Down's syndrome. Summary: A is incorrect because ear dysplasia is not a common feature. B is incorrect as a long, thin neck is not a typical characteristic. D is incorrect because a narrow and raised nasal bridge is not a key feature of Down's syndrome.

Correct Answer: D

Rationale: The correct answer is D because a loss of air conduction, known as conductive hearing loss, refers to a problem conducting sound waves through the outer or middle ear. This type of hearing loss can be caused by issues such as earwax buildup, fluid in the middle ear, or problems with the ear canal or eardrum. Choices A, B, and C are incorrect because air conduction is not the most efficient pathway for hearing (choice A), it is not caused by vibrations of bones in the skull (choice B), and the pitch of sound is determined by the frequency, not the amplitude (choice C). Conductive hearing loss specifically relates to the transmission of sound through the outer and middle ear structures, making choice D the correct statement.

Correct Answer: B

Rationale: The correct answer is B. When a patient experiences nosebleeds, the best way to stop it is by sitting straight with the head tilted slightly forward and pinching the nose firmly for about 10-15 minutes. This position helps reduce blood flow to the nose and promotes clotting. It is important not to tilt the head back as it can lead to blood going down the throat and potentially causing choking or vomiting. Cold compresses can also be applied to help constrict blood vessels. Choices A, C, and D are incorrect as they do not follow the proper technique for managing nosebleeds and can potentially worsen the situation.