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Grade 10 Objective 1
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1 All of these procedures should be
followed for lab safety except A
immediately reporting all dangerous activity B
wearing gloves when necessary C using eye
protection as needed D putting used chemicals
back in the original containers
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2 The reason for wafting or fanning a
small amount of chemical vapors toward the nose
as a means to detect odors in a test tube is to
A avoid experimental error from excessive
loss of mass of reactants or
products B avoid splashing chemicals into the
face of any person C protect the respiratory
tract against potentially harmful vapors D
determine the relative strength of the odor
before smelling directly
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3 Laboratory equipment is cleaned and
properly stored after use primarily so that
A chemical products can be measured and
recorded as data B time is saved in setting
up the next experiment C toxic materials can
be kept in the laboratory D the possibility
of contamination in the laboratory is minimized
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Potential Hazards of Petroleum Naphtha,
Hexane, Toluene, and Acetone 4 The
ingredients described above are used to make a
bonding agent. The most important safety
precaution to take when applying this bonding
agent is to F dry it with a small flame G
work in a well-ventilated area H cover the
work area with newspaper J wear a lab coat
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Powerful Plankton The U.S. Naval Research
Laboratory has created an experimental marine
fuel cell that could produce enough electricity
to power ocean-monitoring devices. This fuel cell
runs on seawater and sediment, with the help of
plankton. Some plankton on the surface of ocean
sediments use dissolved oxygen to break down
organic matter, releasing energy this is an
aerobic process. The plankton in the deeper
sediments break down organic matter without using
oxygen this is an anaerobic process. These two
processes create a difference in voltage between
the surface of the sediment and the sediment
farther down in the seabed. The voltage
difference can be used to produce electricityup
to 5.0102 watts of power. Energy supplied by
this type of fuel cell can be obtained as long as
there is organic matter in the sediment.
5 Which safety precaution should be observed
while analyzing sediment from a marine
aquarium? A Wear rubber gloves B Use a
fume hood C Avoid using glassware D Have
a fire extinguisher nearby
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6 A safety checklist for this
activity should include the presence of a proper
fire extinguisher and all the following items
except a A fire blanket B receptacle
for broken glass C laboratory apron D
squeeze bottle
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7 In what part of this process should
safety precautions be planned? F Q G
R H S J T
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8 All of these should be considered when
storing acids EXCEPT the A correct
labeling of chemicals B safety of people in
the building C shape of the storage
containers D separation of incompatible
chemicals
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9 The diagram shows a standard
technique for dispensing liquid in a laboratory.
What is the main reason that liquid should be
dispensed from a reagent bottle in this
manner? F The liquid is slowly heated by
friction. G The liquids increased surface
area absorbs more oxygen. H The stirring rod
keeps the liquid from splashing. J The beaker
causes liquids of different densities to form
layers.
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10 The chart shows the storage
compatibility of a few chemicals. According to
this chart, which pair of chemicals can be safely
stored together? F Vinyl acetate and
amines G Nitric acid and caustics H
Sulfuric acid and ammonia J Organic acid and
ketones
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11 Which of these was most likely
observed during this investigation? A The
cool water moved into the warm water. B The
water that moved up was less dense. C The
warm water had molecules that moved fast. D
The water moved because heat rises.
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12 Which set of materials would be the
most appropriate to use in testing the effects
of stirring on the dissolving rate of a
solute? A Flask, petri dish, metal rod,
scale, magnifying glass B Beaker, glass rod,
balance, graduated cylinder, timer C Test
tube, filter paper, funnel, flask, ring stand D
Flask, Bunsen burner, ring stand, petri dish,
thermometer
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13 Which of these is a hypothesis that can
be tested through experimentation? F
Bacterial growth increases exponentially as
temperature increases. G A fishs
ability to taste food is affected by the clarity
of aquarium water. H Tadpoles fear
of carnivorous insect larvae increases as the
tadpoles age. J The number of times a dog
wags its tail indicates how content the
dog is.
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14 Which of the following pieces of
equipment would be most appropriate for
measuring the volume of a marble? A C
B D
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15 Objects of the same mass but of
different sizes and shapes were dropped from a
given height. Their rates of free fall were
measured and recorded. Which of the following is
most likely the question this experiment was
designed to answer? F How does height affect
the force of gravity? G How does gravity
affect objects of different densities? H How
do mass and weight affect falling objects? J
How do size and shape affect an objects rate of
free fall?
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16 Which lab setup would be appropriate to
use in heating 100 mL of water to the boiling
point? A A 10 mL test tube held above a
Bunsen burner B A 200 mL beaker placed on a
hot plate C A thermal coil inside a 100 mL
cylinder D A sealed 300 mL flask in a
warm-water bath
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17 In experiments, a benefit of larger
sample sizes would be more A variables B
representative data C time per group D
control groups
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18 The following boxes represent a field.
Which pattern for collecting 10 samples would
provide the best data for identifying the types
of plants in a field? A
C B D
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19 An engineer has created a new engine
for race cars. It is necessary to know which
fuel mixture will allow the engine to run at its
peak performance. Which experimental design is
best for this investigation? F Use one
fuel mixture on the engine and measure its
performance G Use one fuel mixture on
many types of engines and measure their
performance H Use various fuel mixtures on
the engine and measure its performance J
Use various fuel mixtures on many types of
engines and measure their performance
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• 20 Which equipment is most useful when
  measuring the two environmental changes
  mentioned above?
• F Barometer and voltmeter
• G Light meter and barometer
• H Voltmeter and thermometer
• J Thermometer and light meter

Hypothesis At the end of each summer, Texas red
oak (Quercus buckleyi) leaves turn red and fall
off the trees. This is most likely caused by
changes in air temperature and sunlight intensity.
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21 Which of the following is most useful in
determining the kinetic energy of a 50 g
battery-powered car traveling a distance of 10
m? A Beaker B Voltmeter C
Thermometer D Stopwatch
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22 An experiment was designed to determine
the effects of cool temperatures on the
germination of piñon pine seeds. Which of these
variables was LEAST important to control in this
experiment? F The brand name of the
refrigerator used to produce the cool
temperatures G The number of seeds used in
each group H The amount of time that the
seeds were exposed to cool
temperatures J The temperature range used to
define cool temperatures
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23 Which is the best estimate
of the volume of solution released from the
burette? A 47.3 mL B 47.7 mL C 48.3
mL D 48.7 mL
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24 Which of the following shows the length
of a rubber strip measured precisely to 2.22
centimeters?
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25 Which of the following will allow
measurement of a liquids volume with the
greatest precision? A 50 mL cylinder
graduated in 1 mL increments B 100 mL
cylinder graduated in 0.5 mL increments C 100
mL cylinder graduated in 1 mL increments D
200 mL cylinder graduated in 5 mL increments
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26 Which of the following procedures
should be used in finding the mass of
crystals? A Pour the excess crystals back
into the original container B Put the
crystals on the outer part of the balance pan for
massing C Pour wastes down the sink with
plenty of water D Use weighing paper on the
balance pan
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27 The cloud conditions above are
typical of locations near a warm front. According
to these data, what are the most likely sky
conditions for Waco? A Cirrus clouds B
Altostratus clouds C Stratus clouds D
Clear skies
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28 A cold front moves from
Abilene to College Station in 6.0 hours. What is
its average speed in km/h? F 0.018 km/h G
16 km/h H 58 km/h J 67 km/h
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29 What volume should be reported
for the solution in this graduated
cylinder? F 64.0 mL G 56.2 mL H 56.0
mL J 50.6 mL
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Density of Seawater from the Gulf of
Mexico 30 The chart shows the density
of seawater samples collected from the Gulf of
Mexico by four different groups. Which groups
data are most precise? A Group 1 B
Group 2 C Group 3 D Group 4
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31 Which of these axes would be best
to use to analyze these data? A C B D

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32 The picture shows how a
solution can be dispensed by a pipette. How much
solution was released by this pipette? A
0.01 mL B 0.12 mL C 0.14 mL D 0.23 mL
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33 According to the graph, what
partial pressure of oxygen would saturate 67 of
hemoglobin in the blood? A 2.8 kPa B 5.2
kPa C 8.7 kPa D 12.4 kPa
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34 During a severe drought a dry
lake was explored for fossils. The diagram
represents the fossils uncovered and the layers
they were in. According to this information,
this area was once a A forest that was
replaced by a freshwater lake B freshwater
lake that was replaced by a desert C
saltwater sea that was replaced by a forest D
freshwater lake that was replaced by a forest
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35 According to the graph,
about how much hemoglobin would be saturated at
an O2 pressure of 7.3 kPa? A 32 B
67 C 89 D 92
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36 Observing an approaching thunderstorm
and using a stopwatch, a student finds that it
takes 8.40 seconds for thunder to be heard after
a lightning bolt strikes. The student has
learned that it takes 3.0 seconds for sound to
travel 1000 m. How far away is the storm? F
119 m G 185 m H 2800 m J 8400 m
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37 From 1942 to 1945, U.S. nickels were
made of an alloy that contained 35 silver, 9.0
manganese, and the rest copper, by mass. If one
of these nickels has a mass of 5.0 grams, what is
the mass of the copper? A 0.5 g B 1.8
g C 2.2 g D 2.8 g
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38 The graph shows the distance
traveled by a vehicle over a certain period of
time. Which segment of the graph shows the
vehicle moving with the greatest speed? A
L B M C N D O
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39 The table shows the atomic
radii of some elements in Periods 1 through 4 of
the periodic table. Which inference can be made
from this information? F Atomic radii
decrease from left to right. G Atomic radii
increase from bottom to top. H Atomic radii
decrease from right to left. J Atomic radii
double from top to bottom.
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40 The graph shows the
percentage of hemoglobin that combines with
carbon monoxide (CO) at various concentrations.
Exposure to 400 parts per million of CO in air
can cause people to experience nausea and a
throbbing headache. According to the graph,
about what percentage of hemoglobin is bound to
CO at a CO concentration of 400 parts per
million? A 25 B 35 C 40 D 55
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41 In which general
direction do rivers flow in this watershed? F
North G West H Northwest J Southeast
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42 The data table shows how the
thickness of tree trunks in a certain forest is
related to tree age. Use these data to plot
points on the graph above. Draw a straight line
to show a linear relationship for the data.
According to these data, what is the most
likely average radius of 4-year-old trees in
this forest? A 3.0 cm B 3.3 cm C 3.6
cm D 3.9 cm
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43 The graph shows mercury
levels found in sediments, prey animals, and
adult shorebirds in a bay along the Gulf Coast.
Which inference can best be drawn from these
data? F Mercury levels are elevated by the
presence of shorebirds. G Mercury
concentrations are highest in shorebirds. H
Mercury is produced by sediments. J Mercury
assures the survival of prey animals.
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44 The chart shows the types of
organisms found in 100 mL of pond water. Which
graph is the best representation of these
data? A C B D
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45 There are many different ways that
plant epidermal cells can be arranged around
the stomata on plant leaves. Which of these has a
development pattern most similar to the pattern
pictured above? F H G J
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46 The graph shows the growth curves of
a healthy plant and a plant infected with a
fungus. If this trend continues, what will be
the mass of the plant infected with the fungus
at 12 months? F 10 kg G 11 kg H 12
kg J 13 kg
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47 The chart shows the average
change in mass of some frogs during a period of
estivation. If this trend continues, what will be
the average mass of the frogs by the twelfth
week of estivation? F 424 g G 422 g H
420 g J 418 g
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48 Which conclusion is best
supported by these data? F Earths surface
is composed mostly of silicon and calcium. G
Oxygen is closer to Earths surface than
aluminum. H There is more aluminum than
calcium at Earths surface. J Silicon is much
heavier than iron at Earths surface.
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39 Ten different types of culture media
were inoculated with the same strain of bacteria
and incubated at the same temperature. Nine of
the cultures grew. Which of these conclusions
can be drawn from this information? F The
media used in the experiment are all capable of
sustaining bacterial growth. G The
temperature varied greatly during the
experiment. H Only the culture that failed to
grow bacteria was inoculated properly. J
One of the media lacked the nutrients needed
for the bacteria to grow.
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50 Which conclusion about the
frogs is supported by these data? A Four
frogs out of ten preferred the green area. B
The frogs randomly moved into the colored
areas. C Most frogs tended to avoid the red
area. D Most frogs preferred the color blue.
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51 In an investigation 10,000 dung beetles
were examined for the presence of parasites. The
data showed that about 5 of the beetles had
parasites. The results are F invalid
because only dung beetles were examined G
unsupported because the parasite population was
small H erroneous because more beetles should
have had parasites J valid because the sample
size was sufficient for accuracy
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52 A student prepared this
graph of tornadoes reported over a 50-year
period in a midwestern state. Which statement
is supported by these data? A Tornadoes are
less frequent in the morning. B Darkness
increases the strength of tornadoes. C
Tornadoes occurring at night are brief. D The
probability of a tornado is the same throughout
the day.
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Mass of beaker 59.02 g 53
These data show how the mass of an undisturbed
beaker of alcohol varied during a class period.
Which of the following is the best conclusion
that can be made about the investigation? A
The beaker absorbed moisture from the air. B
A chemical change occurred in the beaker. C
The beaker experienced a change of state. D
Some material evaporated from the beaker.
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54 According to this chart,
there seems to be a relationship between the
average number of offspring per species and the
species' A average adult mass B body
covering C average number of predatory
species D body shading
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55 The apparatus above was used to
collect the oxygen that was produced by Elodea.
Which factor was most responsible for the
production of oxygen by Elodea? F Sugar
was present in the liquid. G The liquid
contained enough oxygen for the plant to
absorb. H The presence of light stimulated
photosynthesis. J The plant contained a
large number of mitochondria.
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56 This diagram shows several rock
formations exposed at a construction site. The
job supervisor claimed that Formation T is the
oldest formation. Why is he incorrect? A
Formation S, which is sandstone, formed after
Formation T, which is granite. B The
oldest formations are always in the middle. C
Formation T is an intrusion that cut through the
other rock formations after they were
formed. D An uplift occurred in Formation R,
as happens in the oldest formations.
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57 Certain chemicals in the diet of moth
larvae seem to influence the early development
of the moths wings. Careful observation
of developing pupae could result in A
data to verify the hypothesis B changes to
the conclusion C a conclusion about the
moths eggs D development of a new moth
species
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58 As temperature drops to the dew point,
clouds form in the atmosphere, and dew forms on
ground surfaces. A scientist proposes that
adding more water molecules to the atmosphere
will change the dew point. This proposal is
F an invalid observation G a valid
hypothesis H an invalid problem J a valid
conclusion
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59 In a movie, meteoroids make several
microscopic holes in a pressurized cabin in the
weightless environment of a spaceship.
The astronauts search for the holes by spraying
water droplets from a container. If this were an
actual situation, what effect should
be expected? F The drifting water droplets
float to the location of the holes. G After
falling to the floor, the water forms a stream
leading to the holes. H The water
droplets form a large sphere of water that moves
away from the holes. J Pumping the
trigger on the spray container increases the air
pressure in the cabin.
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60 This statement is a poor hypothesis
because it is not A a question B
testable C observable D a comparison
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61 The information above could
be used most effectively in arguing against
which of these proposals? F Adding chemicals
to a local water supply G Permitting a water
well to be drilled in a state park H Limiting
the use of waterways for recreation J Paving a
meadow to create a parking area
Conclusion Food poisoning by botulism is
increasing in the United States.
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Results of a Scientific Study 62 The
information above could be used most effectively
in arguing against which of these
proposals? F Adding chemicals to a local
water supply G Permitting a water well to be
drilled in a state park H Limiting the use of
waterways for recreation J Paving a meadow to
create a parking area
In natural areas such as forests, about 50 of
the rain seeps into the ground and
becomes groundwater. In some large cities only
about 30 of the rain becomes groundwater.
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63 Pain medications can be made as powders
or tablets. The powders tend to work faster than
tablets with the same ingredients because powder
F dissolves faster in solution than a
single tablet G has more total mass than a
single tablet H travels through the
bloodstream more easily than a tablet J is
easier to swallow than tablets
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64 The owner of a pet store assures a
customer that if she buys only one female
hamster, she will not need to worry about the
hamster having offspring, because there will be
no male with which the female can breed. What
possibility is the pet-store owner
overlooking? F The hamster could be
infertile. G The sex of the hamster could
change. H The hamster could be pregnant. J
The hamster could be a twin.
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65 According to the information
above, which of these is responsible for the
decrease in the black-footed ferret
population? F Competition with prairie dogs
for resources G Reduced numbers of prairie
dogs H Activity of research institutes J
Development of managed wildlife areas
Save Our Species Poster Black-Footed
Ferret This slender animal depends mainly
on prairie dogs for food and shelter. The
ferret lives in prairie dogs underground
tunnels and hunts them at night. When prairie
dogs became scarce, so did black-footed
ferrets. In 1986 the 18 ferrets known to be
alive were moved to a Wyoming research institute.
The number of ferrets has increased, and recently
a few were released into managed wildlife areas.
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66 Which statement above makes the
most valid argument in favor of receiving the
flu vaccine? F Statement 1 G Statement
2 H Statement 3 J Statement 4
PUBLIC SERVICE ANNOUNCEMENT Facts About the Flu
Vaccine 1. The vaccine may be administered either
as a nasal spray or as an injection. 2. Prior to
administration, nasal-spray vaccines must be
stored at 15C or lower. 3. In an experiment,
vaccine recipients had 85 fewer flu episodes
than nonrecipients. 4. The vaccine virus is heat
sensitive and fails to replicate at temperatures
of 38C39C.
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67 Greenhouse emissions from cars
may contribute to global warming. Cars with
better gas mileage emit smaller amounts of
greenhouse gases. Which car would emit the least
amount of greenhouse gases if most of the
driving were done on the highway? A J B
K C L D M
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68 Which of these is
supported by the information above? A Pets
should be kept away from public parks. B
Smokers should get frequent medical
checkups. C Pet immunizations should be kept
up to date. D Smoking in enclosed places
should be discouraged.
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Protein and Fiber Content of Different
Flours 69 Protein and dietary fiber
are beneficial to health. According to the
information in the table, which flour is the most
nutritious? F Whole wheat G White
wheat H Oat J Rice
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Grade 10 Objective 1 Answer Key
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