NLN Pax Science Practice Tests/ 161 Quizzes
with Certified Solutions.
A person blows his breath into a straw that is placed in limewater. The limewater becomes
cloudy because the person's breath contains: - ANSWER: carbon dioxide
A person who was in an auto accident has formed a blood clot at the site of the injury. One
event that can lead to formation of a blood clot is that: - ANSWER: ruptured platelets release
thromboplastin
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? - ANSWER: the
approximate focal length of the lens
In ecological succession, the first living thing to colonize a hitherto barren area is called a: -
ANSWER: pioneer organism
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,Unicellular organisms that have a nucleus and can swim with the aid of cilia are examples of: -
ANSWER: protozoans
Which of these conditions is associated with smoking? - ANSWER: emphysema
Which of these quantities is most closely associated with an object's inertia? - ANSWER: Mass
Which of these sequences of anatomic organization, from the simplest level to the most
complex, is the correct sequence? - ANSWER: From tissue, organ, organ system to organism
Which part of the cell structure controls the passage of materials into and out of the cell? -
ANSWER: Plasma membrane
While working in the chemistry laboratory, a student spills dilute hydrochloric acid on her hand.
What is the first action this student should take? - ANSWER: Flush her hand with large
quantities of water
Within a living cell, the oxygen (O2) from a mixture of O2 and carbon dioxide (CO2) is used up.
This creates a concentration gradient across the cell membrane, drawing O2 across the
membrane from the outside in, a process known as - ANSWER: Diffusion
You cut your finger rather deeply while slicing an apple. Which of these actions should you take
first? - ANSWER: Wash the wound continuously with cold running water
30 students in a class carefully measure the length and width of 20 peanut shells. They also
count the number and note the size of the peanuts inside. This information is recorded on
various graphs showing the numbers of nuts and the different sizes. The collected evidence of
the peanuts gives the students an idea of the extent of: - ANSWER: variation within a species
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, A *tincture* is a solution in which: - ANSWER: alcohol is the solvent
All the glucose filtered from the blood in the glomerulus into the Bowman's capsule of the
kidney nephron is returned to the tissue fluid while passing along the proximal tubule. This
rapid return is effected by the process of: - ANSWER: active transport
If the night temperature drops 50 degrees, the roadrunner's internal energy-conservation
permits a lowering of body temperature to: - ANSWER: 94°F
1 kilogram (kg) of solid X at 10C and 1 kg of solid Y 10C each absorb 5 joules of heat energy. The
final temperatures on X and Y is 15C and 20C, respectively. Compared to X, Y must have a
lower:F - ANSWER: specific heat
A woman suddenly chokes on a piece of food and clutches frantically at her throat. An
immediate remedy is to: - ANSWER: apply quick, hard pressures successively to her abdomen,
just below 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: - ANSWER: carbon dioxide
Night blindness in humans is caused by a lack of: - ANSWER: Vitamin A
In varieties of matter, the term heterogeneous may be applied to: - ANSWER: mixtures, but not
elements or compounds
The atoms of an element with seven valence electrons are most probably classified as: -
ANSWER: nonmetals
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with Certified Solutions.
A person blows his breath into a straw that is placed in limewater. The limewater becomes
cloudy because the person's breath contains: - ANSWER: carbon dioxide
A person who was in an auto accident has formed a blood clot at the site of the injury. One
event that can lead to formation of a blood clot is that: - ANSWER: ruptured platelets release
thromboplastin
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? - ANSWER: the
approximate focal length of the lens
In ecological succession, the first living thing to colonize a hitherto barren area is called a: -
ANSWER: pioneer organism
Page 1 of 18
,Unicellular organisms that have a nucleus and can swim with the aid of cilia are examples of: -
ANSWER: protozoans
Which of these conditions is associated with smoking? - ANSWER: emphysema
Which of these quantities is most closely associated with an object's inertia? - ANSWER: Mass
Which of these sequences of anatomic organization, from the simplest level to the most
complex, is the correct sequence? - ANSWER: From tissue, organ, organ system to organism
Which part of the cell structure controls the passage of materials into and out of the cell? -
ANSWER: Plasma membrane
While working in the chemistry laboratory, a student spills dilute hydrochloric acid on her hand.
What is the first action this student should take? - ANSWER: Flush her hand with large
quantities of water
Within a living cell, the oxygen (O2) from a mixture of O2 and carbon dioxide (CO2) is used up.
This creates a concentration gradient across the cell membrane, drawing O2 across the
membrane from the outside in, a process known as - ANSWER: Diffusion
You cut your finger rather deeply while slicing an apple. Which of these actions should you take
first? - ANSWER: Wash the wound continuously with cold running water
30 students in a class carefully measure the length and width of 20 peanut shells. They also
count the number and note the size of the peanuts inside. This information is recorded on
various graphs showing the numbers of nuts and the different sizes. The collected evidence of
the peanuts gives the students an idea of the extent of: - ANSWER: variation within a species
Page 2 of 18
, A *tincture* is a solution in which: - ANSWER: alcohol is the solvent
All the glucose filtered from the blood in the glomerulus into the Bowman's capsule of the
kidney nephron is returned to the tissue fluid while passing along the proximal tubule. This
rapid return is effected by the process of: - ANSWER: active transport
If the night temperature drops 50 degrees, the roadrunner's internal energy-conservation
permits a lowering of body temperature to: - ANSWER: 94°F
1 kilogram (kg) of solid X at 10C and 1 kg of solid Y 10C each absorb 5 joules of heat energy. The
final temperatures on X and Y is 15C and 20C, respectively. Compared to X, Y must have a
lower:F - ANSWER: specific heat
A woman suddenly chokes on a piece of food and clutches frantically at her throat. An
immediate remedy is to: - ANSWER: apply quick, hard pressures successively to her abdomen,
just below 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: - ANSWER: carbon dioxide
Night blindness in humans is caused by a lack of: - ANSWER: Vitamin A
In varieties of matter, the term heterogeneous may be applied to: - ANSWER: mixtures, but not
elements or compounds
The atoms of an element with seven valence electrons are most probably classified as: -
ANSWER: nonmetals
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