PAX SCIENCE NLN EXAM QUESTIONS AND
ANSWERS
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 Answers -answer: 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 Answers -answer: 120/80 mm Hg
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 Answers -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
A.) ammonia.
B.) methane.
C.) carbon dioxide.
C.) hydrogen. - Correct Answers -answer: carbon dioxide.
Human testes produce
,A.) eggs.
B.) follicle stimulating hormone.
C.) growth hormone.
D.) spermatozoa. - Correct Answers -answer: 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 Answers -answer: 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 Answers -answer: 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 Answers -answer: 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 Answers -answer: 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 Answers -answer: 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 Answers -answer: 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 Answers -answer: 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 Answers -answer: 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 Answers -answer: cell plates are synthesized.
Unicellular organisms that have a nucleus and can swim with the aid of cilia are
examples of
A.) monerans.
B.) plants.
C.) fungi.
D.) protozoans. - Correct Answers -answer: protozoans.
Which of these conditions is associated with smoking?
A.) Esophageal varices.
B.) Tonsillitis.
C.) Emphysema.
D.) Blindness. - Correct Answers -answer: Emphysema.
Which of these equations best illustrates a synthesis reaction?
, A.) 2Na + Cl2 -> 2NaCl
B.) NaOH + HCl -> NaCl + H2O
C.) 2H2O2 -> 2H2O + O2
D.) CH4 + 2O2 -> CO2 + 2H2O - Correct Answers -answer: 2Na + Cl2 -> 2NaCl
Which of these hydrocarbons is a member of the benzene family?
A.) Toluene.
B.) Ethyne.
C.) Propanone.
D.) Methanol. - Correct Answers -answer: Toluene.
Which of these quantities is most closely associated with an object's inertia?
A.) Weight.
B.) Energy.
C.) Power.
D.) Mass. - Correct Answers -answer: Mass
Which of these sequences of anatomic organization, from the simplest level to the most
complex, is the correct sequence?
A.) From tissue, organ, organ system to organism.
B.) From organ system, organ, tissue to organism.
C.) From tissue, organ system, organ to organism.
D.) From organ, organ system, tissue to organism. - Correct Answers -answer: From
tissue, organ, organ system to organism
Which of these single instruments may be used to measure the current flowing through
a circuit?
A.) A voltmeter.
B.) An ammeter.
C.) A potentiometer.
D.) An ohmmeter. - Correct Answers -answer: An ammeter.
Which of these temperatures is known as Absolute Zero?
A.) 0°C
B.) 0 K
C.) positive 273°C
D.) negative 273 K - Correct Answers -answer: 0 K
Which part of the human central nervous system controls voluntary movements?
ANSWERS
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 Answers -answer: 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 Answers -answer: 120/80 mm Hg
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 Answers -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
A.) ammonia.
B.) methane.
C.) carbon dioxide.
C.) hydrogen. - Correct Answers -answer: carbon dioxide.
Human testes produce
,A.) eggs.
B.) follicle stimulating hormone.
C.) growth hormone.
D.) spermatozoa. - Correct Answers -answer: 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 Answers -answer: 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 Answers -answer: 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 Answers -answer: 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 Answers -answer: 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 Answers -answer: 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 Answers -answer: 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 Answers -answer: 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 Answers -answer: 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 Answers -answer: cell plates are synthesized.
Unicellular organisms that have a nucleus and can swim with the aid of cilia are
examples of
A.) monerans.
B.) plants.
C.) fungi.
D.) protozoans. - Correct Answers -answer: protozoans.
Which of these conditions is associated with smoking?
A.) Esophageal varices.
B.) Tonsillitis.
C.) Emphysema.
D.) Blindness. - Correct Answers -answer: Emphysema.
Which of these equations best illustrates a synthesis reaction?
, A.) 2Na + Cl2 -> 2NaCl
B.) NaOH + HCl -> NaCl + H2O
C.) 2H2O2 -> 2H2O + O2
D.) CH4 + 2O2 -> CO2 + 2H2O - Correct Answers -answer: 2Na + Cl2 -> 2NaCl
Which of these hydrocarbons is a member of the benzene family?
A.) Toluene.
B.) Ethyne.
C.) Propanone.
D.) Methanol. - Correct Answers -answer: Toluene.
Which of these quantities is most closely associated with an object's inertia?
A.) Weight.
B.) Energy.
C.) Power.
D.) Mass. - Correct Answers -answer: Mass
Which of these sequences of anatomic organization, from the simplest level to the most
complex, is the correct sequence?
A.) From tissue, organ, organ system to organism.
B.) From organ system, organ, tissue to organism.
C.) From tissue, organ system, organ to organism.
D.) From organ, organ system, tissue to organism. - Correct Answers -answer: From
tissue, organ, organ system to organism
Which of these single instruments may be used to measure the current flowing through
a circuit?
A.) A voltmeter.
B.) An ammeter.
C.) A potentiometer.
D.) An ohmmeter. - Correct Answers -answer: An ammeter.
Which of these temperatures is known as Absolute Zero?
A.) 0°C
B.) 0 K
C.) positive 273°C
D.) negative 273 K - Correct Answers -answer: 0 K
Which part of the human central nervous system controls voluntary movements?
