NLN Pax Science practice tests |
Latest Update with
100% Verified Questions & Answers
(Graded A+)
Ace your nursing school entrance exam with this comprehensive NLN PAX Science Practice
Tests document, featuring realistic questions and clear, step-by-step rationales.
What's Included
• High-Yield Practice Questions: Covers biology, chemistry, physics, and anatomy
and physiology.
• Detailed Rationales: Explains why answers are correct so you can learn core
concepts faster.
• Exam-Style Format: Mimics the actual test layout to improve your pacing and
reduce test anxiety.
Why Buy This Guide
• Save Time: Focus only on the most tested scientific principles.
• Boost Your Score: Clear explanations help you fix weak spots before test day.
• Study Smarter: Perfect for last-minute review or structured daily practice.
1. Respiratory Chemistry
Q1: A person blows his breath into a straw that is placed in limewater. The limewater
becomes cloudy because the person's breath contains:
A1: Carbon dioxide
•
• Detailed Rationale: Limewater is a clear solution of calcium hydroxide. When
carbon dioxide gas reacts with it, it forms calcium carbonate, an insoluble white
precipitate that suspends in the water and makes it appear cloudy or milky. This is a
classic chemical test for the presence of $CO_2$.
•
1
,2. Hematology and Injury
Q2: A person who was in an auto accident has formed a blood clot at the site of the
injury. One event that can lead to formation of a blood clot is that:
A2: Ruptured platelets release thromboplastin
•
• Detailed Rationale: When a blood vessel is injured, platelets aggregate at the site and
rupture. Upon rupturing, they release an enzyme called thromboplastin (tissue factor),
which triggers a coagulation cascade converting prothrombin to thrombin, eventually
forming a stable fibrin clot to stop bleeding.
•
3. Optics and Lens Measurement
Q3: A student focuses sunlight to a point with a thin converging (convex) lens. Which of
these direct measurements can the student make as a result of this experiment?
A3: The approximate focal length of the lens
•
• Detailed Rationale: Sunlight travels in essentially parallel rays. When parallel light
rays pass through a converging (convex) lens, they refract and meet at a single focal
point. Measuring the physical distance between the center of the lens and this bright
point of focused light gives the direct focal length of the lens.
•
4. Ecosystem Dynamics
Q4: In ecological succession, the first living thing to colonize a hitherto barren area is
called a:
A4: Pioneer organism
•
• Detailed Rationale: Pioneer organisms (such as lichens, mosses, and microbes) are
highly adapted to survive in harsh, soil-less, or barren environments. They break
down rock substrates physically and chemically, initiating soil formation so that more
complex plant life can take root later.
•
5. Microbiology
2
, Q5: Unicellular organisms that have a nucleus and can swim with the aid of cilia are
examples of:
A5: Protozoans
•
• Detailed Rationale: Protozoans are single-celled eukaryotic organisms (meaning they
possess a true nucleus). Ciliates, a specific group of protozoans like the Paramecium,
utilize microscopic hair-like projections called cilia to rhythmically beat against fluid
and propel themselves forward.
•
6. Respiratory Pathology
Q6: Which of these conditions is associated with smoking?
A6: Emphysema
•
• Detailed Rationale: Cigarette smoke destroys the delicate walls of the alveoli (air
sacs) in the lungs, reducing the total surface area available for gas exchange. This
chronic respiratory disease is known as emphysema, a major component of Chronic
Obstructive Pulmonary Disease (COPD).
•
7. Classical Mechanics
Q7: Which of these quantities is most closely associated with an object's inertia?
A7: Mass
•
• Detailed Rationale: Inertia is an object's natural resistance to any change in its state
of motion. According to Newton's First Law, mass is the quantitative measure of
inertia; the greater an object's mass, the more force is required to accelerate or
decelerate it.
•
8. Biological Hierarchy
Q8: Which of these sequences of anatomic organization, from the simplest level to the
most complex, is the correct sequence?
A8: From tissue, organ, organ system to organism
•
3
Latest Update with
100% Verified Questions & Answers
(Graded A+)
Ace your nursing school entrance exam with this comprehensive NLN PAX Science Practice
Tests document, featuring realistic questions and clear, step-by-step rationales.
What's Included
• High-Yield Practice Questions: Covers biology, chemistry, physics, and anatomy
and physiology.
• Detailed Rationales: Explains why answers are correct so you can learn core
concepts faster.
• Exam-Style Format: Mimics the actual test layout to improve your pacing and
reduce test anxiety.
Why Buy This Guide
• Save Time: Focus only on the most tested scientific principles.
• Boost Your Score: Clear explanations help you fix weak spots before test day.
• Study Smarter: Perfect for last-minute review or structured daily practice.
1. Respiratory Chemistry
Q1: A person blows his breath into a straw that is placed in limewater. The limewater
becomes cloudy because the person's breath contains:
A1: Carbon dioxide
•
• Detailed Rationale: Limewater is a clear solution of calcium hydroxide. When
carbon dioxide gas reacts with it, it forms calcium carbonate, an insoluble white
precipitate that suspends in the water and makes it appear cloudy or milky. This is a
classic chemical test for the presence of $CO_2$.
•
1
,2. Hematology and Injury
Q2: A person who was in an auto accident has formed a blood clot at the site of the
injury. One event that can lead to formation of a blood clot is that:
A2: Ruptured platelets release thromboplastin
•
• Detailed Rationale: When a blood vessel is injured, platelets aggregate at the site and
rupture. Upon rupturing, they release an enzyme called thromboplastin (tissue factor),
which triggers a coagulation cascade converting prothrombin to thrombin, eventually
forming a stable fibrin clot to stop bleeding.
•
3. Optics and Lens Measurement
Q3: A student focuses sunlight to a point with a thin converging (convex) lens. Which of
these direct measurements can the student make as a result of this experiment?
A3: The approximate focal length of the lens
•
• Detailed Rationale: Sunlight travels in essentially parallel rays. When parallel light
rays pass through a converging (convex) lens, they refract and meet at a single focal
point. Measuring the physical distance between the center of the lens and this bright
point of focused light gives the direct focal length of the lens.
•
4. Ecosystem Dynamics
Q4: In ecological succession, the first living thing to colonize a hitherto barren area is
called a:
A4: Pioneer organism
•
• Detailed Rationale: Pioneer organisms (such as lichens, mosses, and microbes) are
highly adapted to survive in harsh, soil-less, or barren environments. They break
down rock substrates physically and chemically, initiating soil formation so that more
complex plant life can take root later.
•
5. Microbiology
2
, Q5: Unicellular organisms that have a nucleus and can swim with the aid of cilia are
examples of:
A5: Protozoans
•
• Detailed Rationale: Protozoans are single-celled eukaryotic organisms (meaning they
possess a true nucleus). Ciliates, a specific group of protozoans like the Paramecium,
utilize microscopic hair-like projections called cilia to rhythmically beat against fluid
and propel themselves forward.
•
6. Respiratory Pathology
Q6: Which of these conditions is associated with smoking?
A6: Emphysema
•
• Detailed Rationale: Cigarette smoke destroys the delicate walls of the alveoli (air
sacs) in the lungs, reducing the total surface area available for gas exchange. This
chronic respiratory disease is known as emphysema, a major component of Chronic
Obstructive Pulmonary Disease (COPD).
•
7. Classical Mechanics
Q7: Which of these quantities is most closely associated with an object's inertia?
A7: Mass
•
• Detailed Rationale: Inertia is an object's natural resistance to any change in its state
of motion. According to Newton's First Law, mass is the quantitative measure of
inertia; the greater an object's mass, the more force is required to accelerate or
decelerate it.
•
8. Biological Hierarchy
Q8: Which of these sequences of anatomic organization, from the simplest level to the
most complex, is the correct sequence?
A8: From tissue, organ, organ system to organism
•
3
