NLN NEX Practice Questions (2026) — Free Sample Questions with Answers

Answer: A

An infant too young for a vaccine avoids measles because nearly everyone near her is immune: Correct. The infant is protected indirectly because immune people around her break the chain of transmission, which is the passage's definition of herd immunity.

A person recovers from a cold sooner after resting at home and drinking extra fluids: This describes recovery from an illness, not protection of a community through widespread immunity.

A vaccinated adult develops protective antibodies about two weeks after the injection: This is individual immunity from a vaccine; herd immunity is about protecting others who are not immune.

A hospital places a patient with tuberculosis in a special room that keeps air from escaping: Isolation limits spread by separating a patient, not by having most of the community immune.

Application questions ask you to match the passage's principle to a new example; check each choice against the passage's definition.

Answer: C

angry and hostile: Nothing in the sentence suggests hostility; pacing and repeated questions point to worry, not anger.

tired and sluggish: Pacing the room is restless behavior, the opposite of sluggish.

anxious and uneasy: Correct. The contrast word 'despite' plus pacing and repeated questions about results show the patient was worried.

confused and disoriented: The patient knows exactly what he is waiting for, so there is no sign of confusion.

Use context clues: a contrast signal ('despite') and the described behavior usually reveal the meaning of an unfamiliar word.

Answer: A

6: Correct. In order: 3, 4, 5, 7, 9, 12. With six values, the median is the mean of the two middle values: (5 + 7) ÷ 2 = 6.

6.7: 6.7 is the mean (40 ÷ 6), not the median.

8: This averages the two middle values of the unsorted list (4 and 12); values must be ordered first.

9: 9 is the range (12 − 3), a measure of spread, not of center.

Median: sort the data, then take the middle value (or the mean of the two middle values when the count is even).

Answer: C

$45.00: $45.00 is the sale price after the 25% discount, but the 5% tax has not been added.

$48.00: This nets the discount and tax into a single 20% reduction, which is wrong because the tax is applied to the lower sale price.

$47.25: Correct. $60 × 0.75 = $45.00; $45.00 × 1.05 = $47.25.

$63.00: $63.00 adds 5% tax to the original price and ignores the discount.

Apply successive percentage changes one at a time to the new amount: price × (1 − discount) × (1 + tax).

Answer: A

Left atrium: Correct. The pulmonary veins empty oxygenated blood into the left atrium, which passes it to the left ventricle.

Right atrium: The right atrium receives oxygen-poor blood from the body through the venae cavae.

Left ventricle: The left ventricle receives blood from the left atrium and pumps it into the aorta; it is the second chamber, not the first.

Right ventricle: The right ventricle pumps oxygen-poor blood to the lungs through the pulmonary artery.

Blood path: body → right atrium → right ventricle → lungs → left atrium → left ventricle → aorta → body.

Answer: C

75%: 75% of offspring (PP and Pp) are expected to be purple, not white.

50%: 50% is the expected share of heterozygous (Pp) offspring, which have purple flowers.

25%: Correct. A Pp × Pp Punnett square gives 1 PP : 2 Pp : 1 pp; only pp (1 of 4) shows the recessive white color.

0%: Both parents carry the recessive allele, so pp offspring are possible.

A cross of two heterozygotes gives a 1:2:1 genotype ratio and a 3:1 dominant-to-recessive phenotype ratio.