NLN PAX Science Practice Tests 2026/2027
– Questions & Answers | A+ Graded
Complete Study Guide
A person blows his breath into a straw that is placed in limewater. The limewater
becomes cloudy because the person's breath contains: - correct answer-carbon
dioxide
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: - correct
answer-ruptured platelets release thromboplastin
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? - correct answer-the approximate focal length of the lens
,In ecological succession, the first living thing to colonize a hitherto barren area is
called a: - correct answer-pioneer organism
Unicellular organisms that have a nucleus and can swim with the aid of cilia are
examples of: - correct answer-protozoans
Which of these conditions is associated with smoking? - correct answer-
emphysema
Which of these quantities is most closely associated with an object's inertia? -
correct answer-Mass
Which of these sequences of anatomic organization, from the simplest level to
the most complex, is the correct sequence? - correct answer-From tissue, organ,
organ system to organism
Which part of the cell structure controls the passage of materials into and out of
the cell? - correct answer-Plasma membrane
While working in the chemistry laboratory, a student spills dilute hydrochloric
acid on her hand. What is the first action this student should take? - correct
answer-Flush her hand with large quantities of water
Within a living cell, the oxygen (O2) from a mixture of O2 and carbon dioxide
(CO2) is used up. This creates a concentration gradient across the cell membrane,
drawing O2 across the membrane from the outside in, a process known as -
correct answer-Diffusion
, You cut your finger rather deeply while slicing an apple. Which of these actions
should you take first? - correct answer-Wash the wound continuously with cold
running water
30 students in a class carefully measure the length and width of 20 peanut shells.
They also count the number and note the size of the peanuts inside. This
information is recorded on various graphs showing the numbers of nuts and the
different sizes. The collected evidence of the peanuts gives the students an idea
of the extent of: - correct answer-variation within a species
A *tincture* is a solution in which: - correct answer-alcohol is the solvent
All the glucose filtered from the blood in the glomerulus into the Bowman's
capsule of the kidney nephron is returned to the tissue fluid while passing along
the proximal tubule. This rapid return is effected by the process of: - correct
answer-active transport
If the night temperature drops 50 degrees, the roadrunner's internal energy-
conservation permits a lowering of body temperature to: - correct answer-94°F
1 kilogram (kg) of solid X at 10C and 1 kg of solid Y 10C each absorb 5 joules of
heat energy. The final temperatures on X and Y is 15C and 20C, respectively.
Compared to X, Y must have a lower:F - correct answer-specific heat
A woman suddenly chokes on a piece of food and clutches frantically at her
throat. An immediate remedy is to: - correct answer-apply quick, hard pressures
successively to her abdomen, just below her diaphragm
– Questions & Answers | A+ Graded
Complete Study Guide
A person blows his breath into a straw that is placed in limewater. The limewater
becomes cloudy because the person's breath contains: - correct answer-carbon
dioxide
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: - correct
answer-ruptured platelets release thromboplastin
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? - correct answer-the approximate focal length of the lens
,In ecological succession, the first living thing to colonize a hitherto barren area is
called a: - correct answer-pioneer organism
Unicellular organisms that have a nucleus and can swim with the aid of cilia are
examples of: - correct answer-protozoans
Which of these conditions is associated with smoking? - correct answer-
emphysema
Which of these quantities is most closely associated with an object's inertia? -
correct answer-Mass
Which of these sequences of anatomic organization, from the simplest level to
the most complex, is the correct sequence? - correct answer-From tissue, organ,
organ system to organism
Which part of the cell structure controls the passage of materials into and out of
the cell? - correct answer-Plasma membrane
While working in the chemistry laboratory, a student spills dilute hydrochloric
acid on her hand. What is the first action this student should take? - correct
answer-Flush her hand with large quantities of water
Within a living cell, the oxygen (O2) from a mixture of O2 and carbon dioxide
(CO2) is used up. This creates a concentration gradient across the cell membrane,
drawing O2 across the membrane from the outside in, a process known as -
correct answer-Diffusion
, You cut your finger rather deeply while slicing an apple. Which of these actions
should you take first? - correct answer-Wash the wound continuously with cold
running water
30 students in a class carefully measure the length and width of 20 peanut shells.
They also count the number and note the size of the peanuts inside. This
information is recorded on various graphs showing the numbers of nuts and the
different sizes. The collected evidence of the peanuts gives the students an idea
of the extent of: - correct answer-variation within a species
A *tincture* is a solution in which: - correct answer-alcohol is the solvent
All the glucose filtered from the blood in the glomerulus into the Bowman's
capsule of the kidney nephron is returned to the tissue fluid while passing along
the proximal tubule. This rapid return is effected by the process of: - correct
answer-active transport
If the night temperature drops 50 degrees, the roadrunner's internal energy-
conservation permits a lowering of body temperature to: - correct answer-94°F
1 kilogram (kg) of solid X at 10C and 1 kg of solid Y 10C each absorb 5 joules of
heat energy. The final temperatures on X and Y is 15C and 20C, respectively.
Compared to X, Y must have a lower:F - correct answer-specific heat
A woman suddenly chokes on a piece of food and clutches frantically at her
throat. An immediate remedy is to: - correct answer-apply quick, hard pressures
successively to her abdomen, just below her diaphragm
