Grade 8 TCAP Practice Test Question Preview (ID: 36668)


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The construction of an electromagnet would be BEST completed by introducing a current into loops of wire wrapped around
a) a sandstone rock
b) a glass square
c) a plastic rod
d) an iron nail

A factory is producing a machine designed to reduce the amount of air pollution in houses. The machine was produced and sold to the public. After several months, reports show the machine is not working correctly. Which MOST LIKELY caused the outcome?
a) the proper cost analysis was not performed
b) the prototype was not tested before use by the public
c) the designers did not test other types of machines
d) the manufacturing of the machine was done over several months

Which procedure BEST represents the law of conservation of mass?
a) evaporating salt water leaves 5 grams of salt
b) burning 2 kilograms of wood leaves 0.4 kilogram of ash
c) using filter paper to separate 2 grams of solid from 10 grams of water
d) combining 2 grams of copper and 4 grams of sulfur to produce 6 grams of copper sulfate

An unknown substance will be classified as an acid if the substance
a) has a pH of 3
b) is slippery to the touch
c) turns red litmus paper blue
d) releases hydroxide ions in water

Which is BEST used with a bar magnet to produce an electric current?
a) metal coins
b) silver pins
c) paper clips
d) wire coil

A student is to determine how much salt will dissolve in 50 mL of water. Which tool is BEST for measuring the volume of water to be used?
a) 100 mL graduated cylinder
b) thermometer
c) spring scale
d) 25 mL beaker

Which of these represents a chemical change?
a) A match is lit, creating a yellow-orange flame
b) A small piece of ice melts, changing from a solid to a liquid
c) A ball of clay sinks in water, and floats when reshaped
d) A pot of water is heated to boiling, and evaporation occurs

An iron block has an initial mass of 100 grams. As the block rusted, its mass increased. Which BEST explains why the mass increased?
a) Oxygen combines with iron when rust is formed
b) Rust grows as it absorbs energy from the block
c) Water is absorbed as rust forms on the iron block
d) Rust releases heat and makes the iron expand

What is the density of a cube using the formula D=M/V (Density=Mass/Volume) if the cube has a mass of 2 grams and a volume of 1 cubic centimeter?
a) 3.0 grams/cubic centimeter
b) 2.0 grams/cubic centimeter
c) 1.0 grams/cubic centimeter
d) 0.5 grams/cubic centimeter

The main biofuel on the market today is ethanol, a fuel made from corn. Which type of bioengineered product is ethanol?
a) adaptive
b) assistive
c) resistant
d) manipulated

Which statement BEST describes the difference between a mixture and a compound?
a) compounds are pure elements
b) compounds contain elements bonded together
c) compounds can be easily separated into distinct parts
d) compounds have multiple boiling points

A company is designing a dam with a floodgate to keep houses safe during the rainy season. The company is reviewing several possible designs that have worked in the past and is trying to develop a plan for implementing one design. Next step is?
a) pick several dams to use in a consumer survey
b) test each dam model during a different flood season
c) analyze the dam designs and pick one based on local needs
d) redesign the past dams based on what the company feels will work best

An engineering company is testing a new weather-forecasting program. Which procedure would BEST verify that the program is making accurate predictions?
a) comparing the predictions of the program to find the actual weather
b) comparing the predictions of the program to other predictions
c) using the program to verify events not related to weather
d) using the program to verify past weather-related events

The arctic environment has temperatures that range between- 22 degrees Celsius and 6 degrees Celsius with snow covering some of the area. Which adaptation would MOST LIKELY help a population of organisms survive this environment?
a) long necks and tall legs
b) large shell and leathery skin
c) light colored fur and layers of blubber
d) brightly colored feathers and webbed feet

A student applies heat to a solid substance. Which indicates that a chemical change occured?
a) The substance becomes a liquid but solidifies when cooled
b) The substance changes color and stays that color when cooled
c) The substance goes from liquid to a gas very quickly
d) The substance expands but stays the same color

A student observes actions that occurred in four different eggs. Which action describes ONLY a chemical change?
a) a cut up egg
b) a stirred egg
c) a rotting egg
d) a dropped egg

The clearing of a rain forest for agricultural use has led to a decrease in biodiversity in many areas. One potential consequence of deforestation is
a) an increase in the amount of atmospheric oxygen
b) the loss of plants with potential medicinal uses
c) a decrease in soil erosion
d) improved habitat for wildlife

In order to prolong the shelf life of fruits and vegetables, companies expose some types of fruits and vegetables to X-rays in order to kill bacteria. Which BEST describes irradiated fruits and vegetables?
a) adaptive products
b) assistive products
c) synthetic products
d) natural products

A student asks why the ashes from a fire have a much lower mass than the wood that was burned. Which is the CORRECT answer to the student's question?
a) atoms in the wood are destroyed
b) gases are released into the air
c) water inside the wood solidifies
d) heat causes molecules to lose density

The sun is much larger than the moon. Which of these BEST explains why the moon, despite its smaller size, has a greater effect on ocean tides than the sun does?
a) the moon is much closer to the earth
b) the moon produces less light than the sun
c) the moon and earth have the same composition
d) the moon has a lower surface temperature

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