NLN NEX EXAM 300 ACTUAL QUESTIONS AND CORRECT
ANSWERS WITH RATIONALE LATEST 2026 ALREADY
GRADED A+ ASSURED PASS
1. Which of the following is the best definition of the word "adverse" as used in
the context of a medication's side effects?
A) Favorable
B) Unfavorable
C) Predictable
D) Temporary
Correct Answer: B) Unfavorable
Rationale: "Adverse" means harmful or unfavorable. In medicine, an adverse
effect is a negative or harmful reaction to a drug. "Favorable" is the opposite,
"predictable" means expected, and "temporary" means lasting for a limited time .
2. A patient's chart indicates he is "ambivalent" about his upcoming surgery. This
means he:
A) Is very excited.
B) Has conflicting feelings.
C) Is completely indifferent.
D) Has no understanding of the procedure.
Correct Answer: B) Has conflicting feelings.
Rationale: Ambivalence is the state of having mixed feelings or contradictory
ideas about something. It is not excitement (A), indifference (C), or a lack of
understanding (D).
3. Which of the following is a synonym for "mitigate"?
A) Worsen
B) Lessen
C) Ignore
D) Cause
Correct Answer: B) Lessen
Rationale: To "mitigate" means to make something less severe, serious, or
painful. "Lessen" is the most accurate synonym. "Worsen," "ignore," and "cause"
all have opposite or unrelated meanings.
,4. A researcher is studying the "efficacy" of a new drug. Efficacy refers to:
A) The drug's cost-effectiveness.
B) The drug's safety.
C) The drug's ability to produce a desired result.
D) The drug's side effects.
Correct Answer: C) The drug's ability to produce a desired result.
Rationale: Efficacy is defined as the power to produce an effect or the ability to
achieve a desired result. It is not related to cost (A), safety (B), or side effects (D)
directly, though those are other important metrics.
5. The primary purpose of the first paragraph of a passage is usually to:
A) Summarize the main argument.
B) Provide background information and introduce the main idea.
C) Present the conclusion of the argument.
D) Provide specific examples to support the thesis.
Correct Answer: B) Provide background information and introduce the main
idea.
Rationale: The first paragraph of a passage typically introduces the topic and
provides background context, ending with a thesis or main idea. The conclusion is
usually in the final paragraph (C). Specific examples are found in the body
paragraphs (D). A summary of the main argument is not the primary purpose of the
opening paragraph, though it may be previewed (A).
6. What does it mean to "infer" from a passage?
A) To directly quote a statement from the text.
B) To make a logical conclusion based on evidence and reasoning in the text.
C) To disagree with the author's main point.
D) To find a direct statement of fact.
Correct Answer: B) To make a logical conclusion based on evidence and
reasoning in the text.
Rationale: To infer is to deduce or conclude information from evidence and
reasoning rather than from explicit statements. Quoting (A) is direct, while
disagreeing (C) is an opinion. A direct statement of fact (D) is read, not inferred.
7. The main idea of a passage is best described as:
A) A specific detail used to support an argument.
B) The overall message or central point the author is trying to communicate.
C) A question the author poses to the reader.
D) A summary of the author's personal opinion.
, Correct Answer: B) The overall message or central point the author is trying to
communicate.
Rationale: The main idea is the central point or most important concept of a
passage, encompassing the author's primary message. Specific details (A) support
the main idea. It is not necessarily a question (C) or an opinion (D), though it is the
author's central assertion.
8. If a writer's tone is described as "skeptical," the writer is likely:
A) Expressing unwavering support for an idea.
B) Questioning the validity or truth of a claim.
C) Showing a great deal of enthusiasm.
D) Neutral and unbiased.
Correct Answer: B) Questioning the validity or truth of a claim.
Rationale: A skeptical tone indicates doubt or a questioning attitude. It is the
opposite of unwavering support (A) and enthusiasm (C). It is not neutral (D).
9. A researcher is calculating the average dosage of a medication given to patients
in a study. This average is most accurately referred to as the:
A) Median
B) Mode
C) Mean
D) Range
Correct Answer: C) Mean
Rationale: The mean is the arithmetic average of a set of numbers, calculated by
summing all values and dividing by the number of values. The median (A) is the
middle value, the mode (B) is the most frequent value, and the range (D) is the
difference between the highest and lowest values.
10. If a patient's oral temperature is 37.5°C, what is this temperature in Fahrenheit?
(Use the formula: °F = (°C × 9/5) + 32)
A) 97.5°F
B) 98.6°F
C) 99.5°F
D) 100.4°F
Correct Answer: C) 99.5°F
Rationale: Following the formula: (37.5 × 9/5) + 32 = (37.5 × 1.8) + 32 = 67.5 +
32 = 99.5°F. 97.5°F (A), 98.6°F (B), and 100.4°F (D) are different values, with
98.6°F being the normal average body temperature.
, 11. A patient is prescribed 500 mg of an antibiotic, but the pharmacy only stocks
250 mg tablets. How many tablets should the patient take per dose?
A) 1
B) 1.5
C) 2
D) 2.5
Correct Answer: C) 2
Rationale: 500 mg / 250 mg/tablet = 2 tablets. The calculation is a
straightforward division. 1 (A), 1.5 (B), and 2.5 (D) tablets would not provide the
correct 500 mg dose.
12. A solution has a concentration of 0.25 mg/mL. How many milligrams are in 20
mL of this solution?
A) 5 mg
B) 10 mg
C) 15 mg
D) 20 mg
Correct Answer: A) 5 mg
Rationale: Multiply the concentration by the volume: 0.25 mg/mL × 20 mL = 5
mg. This is a direct calculation of the total mass in a solution. 10 mg (B), 15 mg
(C), and 20 mg (D) are incorrect results.
13. The rough endoplasmic reticulum (RER) is distinguished from the smooth ER
by the presence of which structures on its surface?
A) Centrioles
B) Ribosomes
C) Mitochondria
D) Golgi apparatus
Correct Answer: B) Ribosomes
Rationale: The rough endoplasmic reticulum is studded with ribosomes, giving it
a "rough" appearance. These ribosomes are the site of protein synthesis. Centrioles
(A) are involved in cell division, mitochondria (C) are the powerhouse of the cell,
and the Golgi apparatus (D) packages proteins.
14. During which phase of the cell cycle does DNA replication occur?
A) G1 phase
B) S phase
C) G2 phase
D) M phase
Correct Answer: B) S phase
ANSWERS WITH RATIONALE LATEST 2026 ALREADY
GRADED A+ ASSURED PASS
1. Which of the following is the best definition of the word "adverse" as used in
the context of a medication's side effects?
A) Favorable
B) Unfavorable
C) Predictable
D) Temporary
Correct Answer: B) Unfavorable
Rationale: "Adverse" means harmful or unfavorable. In medicine, an adverse
effect is a negative or harmful reaction to a drug. "Favorable" is the opposite,
"predictable" means expected, and "temporary" means lasting for a limited time .
2. A patient's chart indicates he is "ambivalent" about his upcoming surgery. This
means he:
A) Is very excited.
B) Has conflicting feelings.
C) Is completely indifferent.
D) Has no understanding of the procedure.
Correct Answer: B) Has conflicting feelings.
Rationale: Ambivalence is the state of having mixed feelings or contradictory
ideas about something. It is not excitement (A), indifference (C), or a lack of
understanding (D).
3. Which of the following is a synonym for "mitigate"?
A) Worsen
B) Lessen
C) Ignore
D) Cause
Correct Answer: B) Lessen
Rationale: To "mitigate" means to make something less severe, serious, or
painful. "Lessen" is the most accurate synonym. "Worsen," "ignore," and "cause"
all have opposite or unrelated meanings.
,4. A researcher is studying the "efficacy" of a new drug. Efficacy refers to:
A) The drug's cost-effectiveness.
B) The drug's safety.
C) The drug's ability to produce a desired result.
D) The drug's side effects.
Correct Answer: C) The drug's ability to produce a desired result.
Rationale: Efficacy is defined as the power to produce an effect or the ability to
achieve a desired result. It is not related to cost (A), safety (B), or side effects (D)
directly, though those are other important metrics.
5. The primary purpose of the first paragraph of a passage is usually to:
A) Summarize the main argument.
B) Provide background information and introduce the main idea.
C) Present the conclusion of the argument.
D) Provide specific examples to support the thesis.
Correct Answer: B) Provide background information and introduce the main
idea.
Rationale: The first paragraph of a passage typically introduces the topic and
provides background context, ending with a thesis or main idea. The conclusion is
usually in the final paragraph (C). Specific examples are found in the body
paragraphs (D). A summary of the main argument is not the primary purpose of the
opening paragraph, though it may be previewed (A).
6. What does it mean to "infer" from a passage?
A) To directly quote a statement from the text.
B) To make a logical conclusion based on evidence and reasoning in the text.
C) To disagree with the author's main point.
D) To find a direct statement of fact.
Correct Answer: B) To make a logical conclusion based on evidence and
reasoning in the text.
Rationale: To infer is to deduce or conclude information from evidence and
reasoning rather than from explicit statements. Quoting (A) is direct, while
disagreeing (C) is an opinion. A direct statement of fact (D) is read, not inferred.
7. The main idea of a passage is best described as:
A) A specific detail used to support an argument.
B) The overall message or central point the author is trying to communicate.
C) A question the author poses to the reader.
D) A summary of the author's personal opinion.
, Correct Answer: B) The overall message or central point the author is trying to
communicate.
Rationale: The main idea is the central point or most important concept of a
passage, encompassing the author's primary message. Specific details (A) support
the main idea. It is not necessarily a question (C) or an opinion (D), though it is the
author's central assertion.
8. If a writer's tone is described as "skeptical," the writer is likely:
A) Expressing unwavering support for an idea.
B) Questioning the validity or truth of a claim.
C) Showing a great deal of enthusiasm.
D) Neutral and unbiased.
Correct Answer: B) Questioning the validity or truth of a claim.
Rationale: A skeptical tone indicates doubt or a questioning attitude. It is the
opposite of unwavering support (A) and enthusiasm (C). It is not neutral (D).
9. A researcher is calculating the average dosage of a medication given to patients
in a study. This average is most accurately referred to as the:
A) Median
B) Mode
C) Mean
D) Range
Correct Answer: C) Mean
Rationale: The mean is the arithmetic average of a set of numbers, calculated by
summing all values and dividing by the number of values. The median (A) is the
middle value, the mode (B) is the most frequent value, and the range (D) is the
difference between the highest and lowest values.
10. If a patient's oral temperature is 37.5°C, what is this temperature in Fahrenheit?
(Use the formula: °F = (°C × 9/5) + 32)
A) 97.5°F
B) 98.6°F
C) 99.5°F
D) 100.4°F
Correct Answer: C) 99.5°F
Rationale: Following the formula: (37.5 × 9/5) + 32 = (37.5 × 1.8) + 32 = 67.5 +
32 = 99.5°F. 97.5°F (A), 98.6°F (B), and 100.4°F (D) are different values, with
98.6°F being the normal average body temperature.
, 11. A patient is prescribed 500 mg of an antibiotic, but the pharmacy only stocks
250 mg tablets. How many tablets should the patient take per dose?
A) 1
B) 1.5
C) 2
D) 2.5
Correct Answer: C) 2
Rationale: 500 mg / 250 mg/tablet = 2 tablets. The calculation is a
straightforward division. 1 (A), 1.5 (B), and 2.5 (D) tablets would not provide the
correct 500 mg dose.
12. A solution has a concentration of 0.25 mg/mL. How many milligrams are in 20
mL of this solution?
A) 5 mg
B) 10 mg
C) 15 mg
D) 20 mg
Correct Answer: A) 5 mg
Rationale: Multiply the concentration by the volume: 0.25 mg/mL × 20 mL = 5
mg. This is a direct calculation of the total mass in a solution. 10 mg (B), 15 mg
(C), and 20 mg (D) are incorrect results.
13. The rough endoplasmic reticulum (RER) is distinguished from the smooth ER
by the presence of which structures on its surface?
A) Centrioles
B) Ribosomes
C) Mitochondria
D) Golgi apparatus
Correct Answer: B) Ribosomes
Rationale: The rough endoplasmic reticulum is studded with ribosomes, giving it
a "rough" appearance. These ribosomes are the site of protein synthesis. Centrioles
(A) are involved in cell division, mitochondria (C) are the powerhouse of the cell,
and the Golgi apparatus (D) packages proteins.
14. During which phase of the cell cycle does DNA replication occur?
A) G1 phase
B) S phase
C) G2 phase
D) M phase
Correct Answer: B) S phase
