PAX SCIENCE NLN EXAM QUESTIONS & ANSWERS 2026-2027 | UP… EXAM
P R O F E S S I O N A L P R A C T I C E M AT E R I A L S
PAX Science NLN Exam
Questions & Answers
2026-2027 | Updated
Entrance Exam Review
Verified Answers Exam Ready With Rationales
270 QUESTIONS
DOCUMENT OVERVIEW
This document contains 270 verified exam questions with correct answers provided,
ensuring comprehensive coverage of essential science concepts. It serves as a valuable
resource for students preparing for entrance exams and certifications, offering a structured
approach to review and reinforce their understanding of the subject matter. With
immediate access to correct answers, learners can efficiently focus their studies and
enhance their test-taking confidence.
CONTENTS
• Cell Biology • Human Anatomy
• Genetics • Physics Principles
• Nervous System • Chemistry Basics
• Ecology • Physiology
Page 1
,• Chemical Reactions • Measurement and Units
• Reproductive System • Biochemistry
• Fluid Dynamics • Microbiology
• Environmental Science • Evolutionary Biology
E XA M Q U EST I O N S
Q1 QUESTION 1 OF 270
A person blows his breath into a straw that is placed in limewater. The limewater becomes
cloudy because the person's breath contains
A.) carbon dioxide.
B.) hydrogen.
C.) oxygen.
D.) nitrogen.
CORRECT ANSWER
answer: carbon dioxide.
Q2 QUESTION 2 OF 270
An unknown gas is more dense than air, does not support combustion, and turns a limewater
solution cloudy. This gas is most probably
A.) ammonia.
B.) methane.
C.) carbon dioxide.
C.) hydrogen.
CORRECT ANSWER
answer: carbon dioxide.
Page 2
, Q3 QUESTION 3 OF 270
To sterilize a metal probe in the office, a dentist could use a steam sterilizer. If unavailable,
the next most effective method to sterilize the instrument would be
A.) boiling it in water for 15 minutes.
B.) dipping it into a concentrated acid solution.
C.) heating it in a hot air oven at 160°C for 20 minutes.
D.) washing it in soap and water.
CORRECT ANSWER
answer: boiling it in water for 15 minutes.
Q4 QUESTION 4 OF 270
Enzymes that are involved in biochemical reactions are organic
A.) colloids.
B.) catalysts.
C.) cathodes.
D.) constants.
CORRECT ANSWER
answer: Catalysts
Q5 QUESTION 5 OF 270
The most probable area of study that would show the prevalence of mental illness in mid-
Manhattan is that of
CORRECT ANSWER
answer: epidemiology
Q6 QUESTION 6 OF 270
When a column of air is vibrating at the same rate as a tuning fork, the process is referred to
as
Page 3
, CORRECT ANSWER
answer: resonance
Q7 QUESTION 7 OF 270
Which of these germ layers gives rise to the skin?
CORRECT ANSWER
answer: ectoderm
Q8 QUESTION 8 OF 270
All living cells contain cytoplasm. Cytoplasm is important because it
CORRECT ANSWER
answer: controls what moves in and out of the cell.
Q9 QUESTION 9 OF 270
To determine the optimum conditions for the activity of a digestive enzyme, it would be
necessary to test its activity over a range of
CORRECT ANSWER
answer: temperature, pH and substrate concentration.
Q10 QUESTION 10 OF 270
Which of the structures contains valves to prevent blood from flowing in the wrong
direction?
CORRECT ANSWER
answer: veins
Page 4
P R O F E S S I O N A L P R A C T I C E M AT E R I A L S
PAX Science NLN Exam
Questions & Answers
2026-2027 | Updated
Entrance Exam Review
Verified Answers Exam Ready With Rationales
270 QUESTIONS
DOCUMENT OVERVIEW
This document contains 270 verified exam questions with correct answers provided,
ensuring comprehensive coverage of essential science concepts. It serves as a valuable
resource for students preparing for entrance exams and certifications, offering a structured
approach to review and reinforce their understanding of the subject matter. With
immediate access to correct answers, learners can efficiently focus their studies and
enhance their test-taking confidence.
CONTENTS
• Cell Biology • Human Anatomy
• Genetics • Physics Principles
• Nervous System • Chemistry Basics
• Ecology • Physiology
Page 1
,• Chemical Reactions • Measurement and Units
• Reproductive System • Biochemistry
• Fluid Dynamics • Microbiology
• Environmental Science • Evolutionary Biology
E XA M Q U EST I O N S
Q1 QUESTION 1 OF 270
A person blows his breath into a straw that is placed in limewater. The limewater becomes
cloudy because the person's breath contains
A.) carbon dioxide.
B.) hydrogen.
C.) oxygen.
D.) nitrogen.
CORRECT ANSWER
answer: carbon dioxide.
Q2 QUESTION 2 OF 270
An unknown gas is more dense than air, does not support combustion, and turns a limewater
solution cloudy. This gas is most probably
A.) ammonia.
B.) methane.
C.) carbon dioxide.
C.) hydrogen.
CORRECT ANSWER
answer: carbon dioxide.
Page 2
, Q3 QUESTION 3 OF 270
To sterilize a metal probe in the office, a dentist could use a steam sterilizer. If unavailable,
the next most effective method to sterilize the instrument would be
A.) boiling it in water for 15 minutes.
B.) dipping it into a concentrated acid solution.
C.) heating it in a hot air oven at 160°C for 20 minutes.
D.) washing it in soap and water.
CORRECT ANSWER
answer: boiling it in water for 15 minutes.
Q4 QUESTION 4 OF 270
Enzymes that are involved in biochemical reactions are organic
A.) colloids.
B.) catalysts.
C.) cathodes.
D.) constants.
CORRECT ANSWER
answer: Catalysts
Q5 QUESTION 5 OF 270
The most probable area of study that would show the prevalence of mental illness in mid-
Manhattan is that of
CORRECT ANSWER
answer: epidemiology
Q6 QUESTION 6 OF 270
When a column of air is vibrating at the same rate as a tuning fork, the process is referred to
as
Page 3
, CORRECT ANSWER
answer: resonance
Q7 QUESTION 7 OF 270
Which of these germ layers gives rise to the skin?
CORRECT ANSWER
answer: ectoderm
Q8 QUESTION 8 OF 270
All living cells contain cytoplasm. Cytoplasm is important because it
CORRECT ANSWER
answer: controls what moves in and out of the cell.
Q9 QUESTION 9 OF 270
To determine the optimum conditions for the activity of a digestive enzyme, it would be
necessary to test its activity over a range of
CORRECT ANSWER
answer: temperature, pH and substrate concentration.
Q10 QUESTION 10 OF 270
Which of the structures contains valves to prevent blood from flowing in the wrong
direction?
CORRECT ANSWER
answer: veins
Page 4
