NLN Pax Science Practice Tests Questions And
Complete Answers
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
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
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
The inherited factors that are transmitted in a organism from generation to generation
are called its: - answer genotype
Which of these conditions is associated with smoking? - answer Emphysema
Within which of these structures of the female reproductive tract is the human egg
fertilized? - answer Fallopian tube
A cell which manufactures a large amount of protein for export would have an
abundance of organelles called: - answer ribosomes
A lens that focuses distant light to a single point is known as a : - answer converging
, (convex) lens
A substance composed of similar atoms (number of protons is the same for all) that can
not be broken down chemically is a(n) - answer element
Charles Darwin's theory of evolution suggests that the reason for the various
differences between species is a result of: - answer natural selection
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
The amplitude of a sound wave is most closely related to its: - answer loudness
The calorie and the kilocalorie are units of : - answer energy
The force of gravity on an object is that object's: - answer weight
The Law of Dominance was proposed by which of the following scientists? - answer
Mendel
The number of complete waves which pass a point in one second is known as a : -
answer frequency
The vertical columns on the periodic chart are known as: - answer groups
When a sperm and egg join to form a zygote in humans, what determines the sex of the
child that is produced? - answer The sperm
When two atoms *share* a pair of electrons, the bond between them is called: - answer
covalent
Complete Answers
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
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
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
The inherited factors that are transmitted in a organism from generation to generation
are called its: - answer genotype
Which of these conditions is associated with smoking? - answer Emphysema
Within which of these structures of the female reproductive tract is the human egg
fertilized? - answer Fallopian tube
A cell which manufactures a large amount of protein for export would have an
abundance of organelles called: - answer ribosomes
A lens that focuses distant light to a single point is known as a : - answer converging
, (convex) lens
A substance composed of similar atoms (number of protons is the same for all) that can
not be broken down chemically is a(n) - answer element
Charles Darwin's theory of evolution suggests that the reason for the various
differences between species is a result of: - answer natural selection
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
The amplitude of a sound wave is most closely related to its: - answer loudness
The calorie and the kilocalorie are units of : - answer energy
The force of gravity on an object is that object's: - answer weight
The Law of Dominance was proposed by which of the following scientists? - answer
Mendel
The number of complete waves which pass a point in one second is known as a : -
answer frequency
The vertical columns on the periodic chart are known as: - answer groups
When a sperm and egg join to form a zygote in humans, what determines the sex of the
child that is produced? - answer The sperm
When two atoms *share* a pair of electrons, the bond between them is called: - answer
covalent
