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
Page 1 of 52
,B.) 120/80 mm Hg
C.) 100/80 mm Hg
D.) 72/120 mm Hg Answer: 120/80 mm Hg
The force of gravity on an object is that object's Answer: weight
The light sensitive cells of the eye are called rods and cones. Which of these layers of the eye
are they found in? Answer: retina
The meiotic division of cells leads to the production of cells that Answer: contain half the usual
number of chromosomes.
The most probable area of study that would show the prevalence of mental illness in mid-
Manhattan is that of Answer: epidemiology
The normal boiling temperature for water is 100° when measured on which of these scales?
Answer: celsius
What is the pH of a solution whose H+ ion concentration is 1 x 10-2 mole per liter? Answer: 2
When a column of air is vibrating at the same rate as a tuning fork, the process is referred to as
Answer: resonance
When a population is in Hardy-Weinberg equilibrium, which of these conditions must be
present? Answer: The population is isolated from other populations.
When three resistors of 10.0 ohms each are placed in series, the total resistance is Answer:
30.0 ohms
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,Which of these changes occurs in the kidneys when a person becomes dehydrated? Answer:
The filtration rate of water remains constant and the reabsorption of water increases.
Which of these could be stopped by a sheet of paper? Answer: Alpha particle
Which of these is an example of a simple machine? Answer: lever, pulley, inclined plane
Which of these organisms might be found in contaminated well water? Answer: Giardia
Which of these processes occurs at a neuromuscular junction? Answer: Impulse transmission.
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 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? Answer: They will eventually all swim away from the ammonium
hydroxide.
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? Answer:
120/.80 mmHg
Which of these processes is responsible for the recorded production of CO2 by yeast cells from
sugar solution? Answer: anaerobic respiration
Page 3 of 52
, In classical physics, light is viewed as part of the electromagnetic spectrum, traveling in the form
of transverse waves. Quantum physics proposes that light is composed of quanta called Answer:
photons
Enzymes that are involved in biochemical reactions are organic Answer: catalysts
How much current is drawn by a light bulb that has a resistance of 100 R with a voltage of 110
V? (V = IR) Answer: 1.1 amperes
Sodium will react most readily with Answer: chlorine
The watt is a unit of Answer: power
The boiling point of liquid nitrogen at one atmosphere pressure is 77 K. This temperature is
equivalent to. Answer: - 196 C
The energy associated with an object's position is termed Answer: potential energy
The extension of a neuron that carries the impulse to another cell is called Answer: axon
What is the correct sequence in the life cycle of a moth? Answer: Egg, larva, pupa, adult.
When water passes from a region of greater concentration to a region of lesser concentration
through a selectively permeable membrane, the process is known as Answer: osmosis
Which of these experiments would be an effective way to determine the distribution of touch
receptors in the skin? Answer: Have a blindfolded student tell when a bristle placed lightly
against the skin is felt.
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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
Page 1 of 52
,B.) 120/80 mm Hg
C.) 100/80 mm Hg
D.) 72/120 mm Hg Answer: 120/80 mm Hg
The force of gravity on an object is that object's Answer: weight
The light sensitive cells of the eye are called rods and cones. Which of these layers of the eye
are they found in? Answer: retina
The meiotic division of cells leads to the production of cells that Answer: contain half the usual
number of chromosomes.
The most probable area of study that would show the prevalence of mental illness in mid-
Manhattan is that of Answer: epidemiology
The normal boiling temperature for water is 100° when measured on which of these scales?
Answer: celsius
What is the pH of a solution whose H+ ion concentration is 1 x 10-2 mole per liter? Answer: 2
When a column of air is vibrating at the same rate as a tuning fork, the process is referred to as
Answer: resonance
When a population is in Hardy-Weinberg equilibrium, which of these conditions must be
present? Answer: The population is isolated from other populations.
When three resistors of 10.0 ohms each are placed in series, the total resistance is Answer:
30.0 ohms
Page 2 of 52
,Which of these changes occurs in the kidneys when a person becomes dehydrated? Answer:
The filtration rate of water remains constant and the reabsorption of water increases.
Which of these could be stopped by a sheet of paper? Answer: Alpha particle
Which of these is an example of a simple machine? Answer: lever, pulley, inclined plane
Which of these organisms might be found in contaminated well water? Answer: Giardia
Which of these processes occurs at a neuromuscular junction? Answer: Impulse transmission.
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 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? Answer: They will eventually all swim away from the ammonium
hydroxide.
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? Answer:
120/.80 mmHg
Which of these processes is responsible for the recorded production of CO2 by yeast cells from
sugar solution? Answer: anaerobic respiration
Page 3 of 52
, In classical physics, light is viewed as part of the electromagnetic spectrum, traveling in the form
of transverse waves. Quantum physics proposes that light is composed of quanta called Answer:
photons
Enzymes that are involved in biochemical reactions are organic Answer: catalysts
How much current is drawn by a light bulb that has a resistance of 100 R with a voltage of 110
V? (V = IR) Answer: 1.1 amperes
Sodium will react most readily with Answer: chlorine
The watt is a unit of Answer: power
The boiling point of liquid nitrogen at one atmosphere pressure is 77 K. This temperature is
equivalent to. Answer: - 196 C
The energy associated with an object's position is termed Answer: potential energy
The extension of a neuron that carries the impulse to another cell is called Answer: axon
What is the correct sequence in the life cycle of a moth? Answer: Egg, larva, pupa, adult.
When water passes from a region of greater concentration to a region of lesser concentration
through a selectively permeable membrane, the process is known as Answer: osmosis
Which of these experiments would be an effective way to determine the distribution of touch
receptors in the skin? Answer: Have a blindfolded student tell when a bristle placed lightly
against the skin is felt.
Page 4 of 52
