PAX Science NLN Exam / 270 Q&A / 2024-
2025.
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. 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 Answer: 120/80 mm Hg
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. 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 Answer: 0 K
Which part of the human central nervous system controls voluntary movements?
A.) Spinal cord.
B.) Cerebellum.
C.) Cerebrum.
D.) Medulla. Answer: Cerebrum.
Within which of these structures of the female reproductive tract is the human egg fertilized?
,A.) Uterus.
B.) Fallopian tube.
C.) Vagina.
D.) Cervix. Answer: Fallopian tube.
You cut your finger rather deeply while slicing an apple. Which of these actions should you take
first?
A.) Apply a sterile adhesive bandage.
B.) Press the cut surface to stop the flow of blood.
C.) Swab the wound with mild antiseptic.
D.) Wash the wound continuously with cold running water. Answer: Wash the wound
continuously with cold running water.
A lens that focuses distant light to a single point is known as a
A.) converging lens.
B.) diverging lens.
C.) concave lens.
D.) prismatic lens. Answer: converging lens.
A magician rapidly pulls a tablecloth from a table, leaving the dishes undisturbed. Which of
these principles of physics explains this "trick"?
A.) Gravitational force depends directly on mass.
B.) Objects at rest tend to remain at rest.
C.) Force equals mass times acceleration.
D.) An object traveling at constant velocity has no net force on it. Answer: Objects at rest tend
to remain at rest.
, A quantity that has both magnitude and direction is called a(n)
A.) resultant.
B.) scalar.
C.) vector.
D.) undefined unit. Answer: vector.
A recently discovered species has these characteristics: amniotic eggs, a four-chambered heart,
and lightweight, honeycombed bones. Which of these ADDITIONAL characteristics is likely to be
present?
A.) Mammary glands.
B.) External fertilization.
C.) Ectotherms.
D.) Feathers for flying. Answer: Feathers for flying.
Amnesia in humans is the loss of memory. Which of these parts of the brain has been affected
when someone is suffering from amnesia caused by head trauma?
A.) Cerebral cortex.
B.) Cerebellum.
C.) Medulla oblongata.
D.) Spinal cord. Answer: Cerebral cortex.
An example of the most complex level of organization in a frog is the
A.) epithelium.
B.) striated muscle.
2025.
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. 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 Answer: 120/80 mm Hg
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. 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 Answer: 0 K
Which part of the human central nervous system controls voluntary movements?
A.) Spinal cord.
B.) Cerebellum.
C.) Cerebrum.
D.) Medulla. Answer: Cerebrum.
Within which of these structures of the female reproductive tract is the human egg fertilized?
,A.) Uterus.
B.) Fallopian tube.
C.) Vagina.
D.) Cervix. Answer: Fallopian tube.
You cut your finger rather deeply while slicing an apple. Which of these actions should you take
first?
A.) Apply a sterile adhesive bandage.
B.) Press the cut surface to stop the flow of blood.
C.) Swab the wound with mild antiseptic.
D.) Wash the wound continuously with cold running water. Answer: Wash the wound
continuously with cold running water.
A lens that focuses distant light to a single point is known as a
A.) converging lens.
B.) diverging lens.
C.) concave lens.
D.) prismatic lens. Answer: converging lens.
A magician rapidly pulls a tablecloth from a table, leaving the dishes undisturbed. Which of
these principles of physics explains this "trick"?
A.) Gravitational force depends directly on mass.
B.) Objects at rest tend to remain at rest.
C.) Force equals mass times acceleration.
D.) An object traveling at constant velocity has no net force on it. Answer: Objects at rest tend
to remain at rest.
, A quantity that has both magnitude and direction is called a(n)
A.) resultant.
B.) scalar.
C.) vector.
D.) undefined unit. Answer: vector.
A recently discovered species has these characteristics: amniotic eggs, a four-chambered heart,
and lightweight, honeycombed bones. Which of these ADDITIONAL characteristics is likely to be
present?
A.) Mammary glands.
B.) External fertilization.
C.) Ectotherms.
D.) Feathers for flying. Answer: Feathers for flying.
Amnesia in humans is the loss of memory. Which of these parts of the brain has been affected
when someone is suffering from amnesia caused by head trauma?
A.) Cerebral cortex.
B.) Cerebellum.
C.) Medulla oblongata.
D.) Spinal cord. Answer: Cerebral cortex.
An example of the most complex level of organization in a frog is the
A.) epithelium.
B.) striated muscle.
