NLN PAX Science Practice Tests 2026/2027
– Complete Exam Prep & Q&A
1 kilogram (kg) of solid X at 10°C and 1 kg of solid Y at 10°C each absorb 5 joules of
heat energy. The final temperatures of X and Y are 15°C and 20°C, respectively.
Compared to X, Y must have a lower - correct answer-specific heat
A drop of dilute ammonium hydroxide (NH4OH) is placed on one side of a slide
containing a large number of swimming paramecium. Under this condition, which
of these behaviors of the paramecia will be observed? - correct answer-they will
eventually al *swim away* from the ammonium hydroxide
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 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
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 beneath her diaphragm
,An unknown gas is more dense than air, does not support combustion, and turns
a limewater solution cloudy. This gas is most probably - correct answer-carbon
dioxide
Guard cells which can be found in the leaves of plants are most closely associated
with which of these processes? - correct answer-evaporation of water from the
plant
If a red light is passed through a dilute solution of chlorophyll solution, the
spectrophotometer will detect what amount of transmittance of this light? -
correct answer-50-75%
If the medulla of the brain in a human was damaged, which of these conditions
would most likely result? - correct answer-difficulty in breathing
Iodized salt is used to prevent a human condition known as - correct answer-
goiter
the atoms of an element with seven valence electrons are most probably
classified as - correct answer-nonmetals
The bending of a wave around an obstacle is known as - correct answer-
diffraction
The inherited factors that are transmitted in an organism from generation to
generation are called its - correct answer-genotype
, The organ that filters metabolic waste from the blood is the - correct answer-
kidney
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 equations best illustrates a synthesis reaction? - correct answer-
2Na+ Cl --> 2NaCl
Which of these hydrocarbons is a member of the benzene family? - correct
answer-toluene
which of these organisms use nitrogen directly from the air? - correct answer-
blue-green algae
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 --> organism
which of these substances contains a nonpolar covalent bond? - correct answer-
O2
which part of the cell structure controls the passage of materials into and out of
the cell? - correct answer-plasma membrane
– Complete Exam Prep & Q&A
1 kilogram (kg) of solid X at 10°C and 1 kg of solid Y at 10°C each absorb 5 joules of
heat energy. The final temperatures of X and Y are 15°C and 20°C, respectively.
Compared to X, Y must have a lower - correct answer-specific heat
A drop of dilute ammonium hydroxide (NH4OH) is placed on one side of a slide
containing a large number of swimming paramecium. Under this condition, which
of these behaviors of the paramecia will be observed? - correct answer-they will
eventually al *swim away* from the ammonium hydroxide
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 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
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 beneath her diaphragm
,An unknown gas is more dense than air, does not support combustion, and turns
a limewater solution cloudy. This gas is most probably - correct answer-carbon
dioxide
Guard cells which can be found in the leaves of plants are most closely associated
with which of these processes? - correct answer-evaporation of water from the
plant
If a red light is passed through a dilute solution of chlorophyll solution, the
spectrophotometer will detect what amount of transmittance of this light? -
correct answer-50-75%
If the medulla of the brain in a human was damaged, which of these conditions
would most likely result? - correct answer-difficulty in breathing
Iodized salt is used to prevent a human condition known as - correct answer-
goiter
the atoms of an element with seven valence electrons are most probably
classified as - correct answer-nonmetals
The bending of a wave around an obstacle is known as - correct answer-
diffraction
The inherited factors that are transmitted in an organism from generation to
generation are called its - correct answer-genotype
, The organ that filters metabolic waste from the blood is the - correct answer-
kidney
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 equations best illustrates a synthesis reaction? - correct answer-
2Na+ Cl --> 2NaCl
Which of these hydrocarbons is a member of the benzene family? - correct
answer-toluene
which of these organisms use nitrogen directly from the air? - correct answer-
blue-green algae
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 --> organism
which of these substances contains a nonpolar covalent bond? - correct answer-
O2
which part of the cell structure controls the passage of materials into and out of
the cell? - correct answer-plasma membrane
