Grade 8 TCAP Test 2 Question Preview (ID: 36681)
8th Grade TCAP Practice.
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Which two items are BEST to use to determine the combined volume of 3 small rocks?
a) electric scale and ruler
b) graduated cylinder and water
c) hot plate and beaker
d) meter stick and eye dropper
Which properties MOST LIKELY indicate that a substance is a base?
a) releases hydrogen gas and reacts with metal
b) turns red litmus paper blue and conducts an electric current
c) turns blue litmus paper red and conducts an electric current
d) has a pH below 7 and corrodes a nail
Wire coils spinning between 2 magnets will produce
a) cold
b) electricity
c) steam
d) chemicals
Student records the speed of blue cars vs red cars. The avg speed of red cars was 70 mph, avg speed of blue cars was 68 mph. The student concludes that red paint makes cars go faster. Which statement identifies an error in the student's conclusion?
a) the conclusion was made based on two types of cars
b) the observation was made on several highways
c) the observation shows information for several times of day
d) the conclusion claims that there is a cause and effect without evidence
A student coils a copper wire around a bar magnet. Which action will cause the device to generate electricity?
a) the student connects the copper wire to a light bulb
b) the student insulates the copper wire with plastic
c) the student uses a horseshoe magnet instead of a bar magnet
d) the student moves the bar magnet through the copper wire coils
Which keeps Earth in its orbit?
a) the rotation of Earth
b) the gravity of the sun
c) the revolution of the moon
d) the gravity of the moon
A nuclear power plant has recently been built to generate electricity for a town located near several small lakes. Which is NOT a benefit of this nuclear power plant being built?
a) the cost of the electricity will decrease
b) the loss of habitat for local wildlife
c) the heating of homes will be easier
d) the nuclear power plant will provide jobs
A student wants to test how the concentration of phosphorous in a fertilizer affects plant growth. In designing this experiment the independent variable would MOST LIKELY be the
a) amount of phosphorous used per plant
b) height each plant grows after given fertilizer
c) type of each plant used
d) type of phosphorous used
A student designs as experiment to test the acidity of the water in several ponds near an industrial area. Which tool would BEST help a student obtain accurate data?
a) oxygen probe
b) metric ruler
c) pH indicator
d) heat sensor
A student observes a tree with small, needle-like leaves that stay green year round. Which conclusion can the student draw from the shape of the leaves?
a) the leaves of the tree do not perform photosynthesis
b) the leaves of the tree have an illness that stunts their growth
c) the leaves of the tree are nonfunctional
d) the leaves of the tree are intended to reduce water loss
Bob investigated how the mass of a plastic disk affected its motion. He pushed five disks, each with different mass, across a wooden floor, recorded the distance of each and repeated this 5 times. He concluded there was no relationship. Error?
a) the student performed too few trials
b) the student should have used disks that were the same mass
c) the student should have pushed the disks across different surfaces
d) the student failed to control the amount of force applied
Which statement BEST describes what the planet Saturn, a lizard, and a steaming kettle have in common?
a) all are made of atoms
b) all are multicellular organisms
c) all are at the same internal temperature
d) all produce their own energy without help
A student observes that a gas is formed when chemical Y is added to chemical Z in a lab. The student's observation of a new product being formed is the common outcome of all
a) physical changes
b) chemical changes
c) mass changes
d) phase changes
A combination of salt and sugar grains is BEST classified as a mixture because
a) the grains taste different from one another
b) both the salt and sugar grains are in the same state of matter
c) no new chemical bonds are formed between the salt and sugar grains
d) a new product is formed when the salt and sugar grains are combined
Which elements make up MOST of the earth's atmosphere?
a) oxygen and nitrogen
b) nitrogen and helium
c) water vapor and helium
d) oxygen and water vapor
A 5 gram sample of water occupies 5 mL of space in a beaker. Using the formula D=M/V (density=mass/volume), what is the density of the water sample?
a) 1 gram/mL
b) 5 gram/mL
c) 10 grams/mL
d) 25 grams/mL
Which statement BEST describes a physical change?
a) a process separates water into hydrogen gas and oxygen gas
b) an iron nail exposed to the atmosphere forms rust
c) burning carbon releases the gas carbon dioxide
d) salt added to a cup of water makes salt water
Which of these occurs during all chemical changes?
a) new elements are formed
b) temperature increases
c) new bonds form between atoms
d) phase changes from solid to liquid
Which statement describes a possible consequence if biodiversity were to decrease in the arctic due to the extinction of polar bears?
a) changes in the food web, leading to a loss of food resources for native people
b) an increase in the number of producers after a herbivore population boom
c) a decrease in the number of herbivores due to natural predators being gone
d) a disturbance in weather patterns, leading to a higher average water temperature.
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