PAX Science NLN Exam questions and
answers 2026 Latest Update
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>> carbon dioxide.
A physician measures the pulse and blood pressure (BP) of all patients on a routine basis. Which of these
measurements show the normal BP values for a resting adult patient?
A.) 125/95 mm Hg
B.) 120/80 mm Hg
C.) 100/80 mm Hg
D.) 72/120 mm Hg
CORRECT>> 120/80
mm Hg Previous
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0:12
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0:15
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,Brainpower
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A woman suddenly chokes on a piece of food and clutches frantically at her throat. An immediate
remedy is to
A.) have her bend forward and tell her to cough.
B.) insert a finger or a blunt object toward the back of the mouth.
C.) apply quick, hard pressures successively to her abdomen, just beneath her diaphragm.
D.) phone "emergency" for help.
CORRECT>> 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
A.) ammonia.
B.) methane.
C.) carbon dioxide.
C.) hydrogen.
CORRECT>> carbon dioxide.
Human testes produce
A.) eggs.
B.) follicle stimulating hormone.
C.) growth hormone.
D.) spermatozoa.
CORRECT>> spermatozoa.
If a red light is passed through a dilute solution of chlorophyll solution, the spectrophotometer will
detect what amount of transmittance of this light?
A.) 100%
B.) 50 - 75%
C.) Less than 25%
,D.) None
CORRECT>> 50 - 75%
In diagnostic testing, the electroencephalogram permits the physician to
A.) examine the impulses of the specialized muscle cells of the heart.
B.) examine the impulses of the nerve cells within the brain.
C.) measure the pressure within the eye.
D.) measure the amount of air upon exhalation.
CORRECT>> examine the impulses of the nerve cells within the brain.
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>> boiling it in water for 15 minutes.
In varieties of matter, the term heterogeneous may be applied to
A.) elements, but not compounds.
B.) compounds, but not elements.
C.) compounds and elements, but not mixtures.
D.) mixtures, but not elements or compounds.
CORRECT>> mixtures, but not elements or compounds.
Heat energy is absorbed in which of these phase changes?
A.) Br2 (l) -> Br2(s)
B.) Br2 (g) --> Br2(l)
C.) Br2 (l) -> Br2(g)
D.) Br2 (g) -> Br2(s)
, CORRECT>> Br2 (l) -> Br2(g)
Periodontitis is an inflammatory condition of the
A.) gum tissue that surrounds the neck of each tooth.
B.) pulp that contains nerve cells and blood vessels of the tooth.
C.) dentin that surrounds the soft part of a tooth.
D.) enamel that provides a hard surface for chewing.
CORRECT>> gum tissue that surrounds the neck of each tooth.
The atoms of an element with seven valence electrons are most probably classified as
A.) metals.
B.) nonmetals.
C.) metalloids.
D.) noble gases.
CORRECT>> nonmetals.
The inherited factors that are transmitted in an organism from generation to generation are called its
A.) homozygote.
B.) heterozygote.
C.) genotype.
D.) phenotype.
CORRECT>> genotype.
The process of nuclear cell division in the cell reproduction of plants differs from mammals. A major
difference is that
A.) homologous chromosomes are paired.
B.) centrioles are replicated.
C.) spindle fibers are missing.
D.) cell plates are synthesized.
CORRECT>> cell plates are synthesized.
answers 2026 Latest Update
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>> carbon dioxide.
A physician measures the pulse and blood pressure (BP) of all patients on a routine basis. Which of these
measurements show the normal BP values for a resting adult patient?
A.) 125/95 mm Hg
B.) 120/80 mm Hg
C.) 100/80 mm Hg
D.) 72/120 mm Hg
CORRECT>> 120/80
mm Hg Previous
Pause
Next
Rewind 10 seconds
Move forward 10 seconds
Unmute
0:12
/
0:15
Full screen
,Brainpower
Read More
A woman suddenly chokes on a piece of food and clutches frantically at her throat. An immediate
remedy is to
A.) have her bend forward and tell her to cough.
B.) insert a finger or a blunt object toward the back of the mouth.
C.) apply quick, hard pressures successively to her abdomen, just beneath her diaphragm.
D.) phone "emergency" for help.
CORRECT>> 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
A.) ammonia.
B.) methane.
C.) carbon dioxide.
C.) hydrogen.
CORRECT>> carbon dioxide.
Human testes produce
A.) eggs.
B.) follicle stimulating hormone.
C.) growth hormone.
D.) spermatozoa.
CORRECT>> spermatozoa.
If a red light is passed through a dilute solution of chlorophyll solution, the spectrophotometer will
detect what amount of transmittance of this light?
A.) 100%
B.) 50 - 75%
C.) Less than 25%
,D.) None
CORRECT>> 50 - 75%
In diagnostic testing, the electroencephalogram permits the physician to
A.) examine the impulses of the specialized muscle cells of the heart.
B.) examine the impulses of the nerve cells within the brain.
C.) measure the pressure within the eye.
D.) measure the amount of air upon exhalation.
CORRECT>> examine the impulses of the nerve cells within the brain.
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>> boiling it in water for 15 minutes.
In varieties of matter, the term heterogeneous may be applied to
A.) elements, but not compounds.
B.) compounds, but not elements.
C.) compounds and elements, but not mixtures.
D.) mixtures, but not elements or compounds.
CORRECT>> mixtures, but not elements or compounds.
Heat energy is absorbed in which of these phase changes?
A.) Br2 (l) -> Br2(s)
B.) Br2 (g) --> Br2(l)
C.) Br2 (l) -> Br2(g)
D.) Br2 (g) -> Br2(s)
, CORRECT>> Br2 (l) -> Br2(g)
Periodontitis is an inflammatory condition of the
A.) gum tissue that surrounds the neck of each tooth.
B.) pulp that contains nerve cells and blood vessels of the tooth.
C.) dentin that surrounds the soft part of a tooth.
D.) enamel that provides a hard surface for chewing.
CORRECT>> gum tissue that surrounds the neck of each tooth.
The atoms of an element with seven valence electrons are most probably classified as
A.) metals.
B.) nonmetals.
C.) metalloids.
D.) noble gases.
CORRECT>> nonmetals.
The inherited factors that are transmitted in an organism from generation to generation are called its
A.) homozygote.
B.) heterozygote.
C.) genotype.
D.) phenotype.
CORRECT>> genotype.
The process of nuclear cell division in the cell reproduction of plants differs from mammals. A major
difference is that
A.) homologous chromosomes are paired.
B.) centrioles are replicated.
C.) spindle fibers are missing.
D.) cell plates are synthesized.
CORRECT>> cell plates are synthesized.
