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Grade 8 Science - 2004 Released Test
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Grade 8 Science - 2004 Released Test
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<img src="33-4.png" alt="33-4.png" title="33-4" width="359" height="81"></img><br />(2004)Some snapdragon seeds were studied in the experiment above. The seeds were placed in a dish lined with a moist paper towel. Which of these is the independent (manipulated) variable in this experiment?10001The type of seed001The amount of water used001The number of sprouts001The temperature of each dish11001<img src="13-4.png" alt="13-4.png" title="13-4" width="235" height="256" style="float: right;"></img>(2004)This experiment was set up to test the hypothesis that plants grow faster in green light. The same amount of water and fertilizer were added to each pot. Which of these would improve the experiment?10001Use green lights for all three plants001Add more types of plants001Use the same kind of plant in all trials11001Use different pots for each plant<br /><br />001(2004) John and Emily were experimenting with the effects of road salt on plant growth. To do this, they watered plants daily with the same amount of salt water. They could <em>best </em>improve their experiment by —10001increasing the amount of salt added to the water each day001cooling the salt water before watering the plants001adding food color to see how far the salt penetrates the plants001watering half the plants with pure water and half with salt water11001<img src="24.png" alt="24.png" title="24" width="348" height="367" style="float: right;"></img>(2004) The line graph shows the heights of plants grown in fertilized and unfertilized soil. Based on this information, what will <em>most </em>likely occur on day six? 10001Neither plant should increase by 1 cm in height.11001Plant A should increase about 1 cm in height.001Plant B should increase about 1 cm in height.001Plant A should increase about 2 cm in height.<br /><br /><br /><br />001<img src="32-4.png" alt="32-4.png" title="32-4" width="270" height="226" style="float: right;"></img>>(2004) This chart represents the type and number of items collected in a beach cleanup. Based on the above chart, what percentage of the total items collected from the beaches was plastic?1000146%00149%00156%1100170%001(2004) Which of the following is used to measure the mass of an object?10001Balance11001Metric ruler001Graduated cylinder001Barometer001<img src="4-4.png" alt="4-4.png" title="4-4" width="328" height="277" style="float: right;"></img>(2004) The diagram shows a graduated cylinder containing water. From which position will the most accurate measure of the volume of the water be made?10001Position 1001Position 2001Position 311001Position 4<br /><br /><br />001(2004) The density of an object is dependent upon the object’s mass and —10001height001area001volume11001weight001(2004) At what speed would a car have to move in order to travel 20 kilometers in two hours?100015 km/hr00110 km/hr1100120 km/hr00140 km/hr001MATTER10001SSS001SSS001SS11001SS001<img src="2-4.png" alt="2-4.png" title="2-4" width="346" height="179" style="float: right;"></img>(2004) Which of these minerals is a carbonate?10001Calcite (CaCO<sub>3</sub>)11001Galena (PbS)001Gypsum (CaSO<sub>4</sub>)001Magnetite (Fe<sub>3</sub>O<sub>4</sub>)001<img src="37-4.png" alt="37-4.png" title="37-4" width="374" height="354" style="float: right;"></img>(2004) Which of the following lists the elements in order, from those having the <em>least </em>protons to those having the <em>most </em>protons in the atoms?10001O, N, B, Li001Na, S, Al, Cl001O, S, Se, Te11001Rb, K, Na, Li<br /><br /><br /><br /><br />001(2004) If you break a piece of glass, the shape of the glass changes, but the properties in the fragments remain the same. Which of the following has occurred?10001A chemical change001A temperature change001A phase change001A physical change11001(2004) Which of these belongs in the outermost shell (energy level) of an atom?10001Electrons11001Protons001Neutrons001Photons001(2004) Which of these is best classified as a mixture?10001Carbon dioxide001Water001Soil11001Iron001(2004) Calcium metal (Ca) can be produced by passing an electric current through molten calcium chloride (CaCl<sub>2</sub>). Chlorine gas (Cl<sub>2</sub>) is also formed. What is the balanced equation for this reaction?100012CaCl → Ca + 2Cl001CaCl<sub>2</sub> + H<sub>2</sub>O → Ca + ClH + O<sub>2</sub>001CaCl<sub>2</sub> + Cl → Ca + Cl<sub>3</sub>001CaCl<sub>2</sub> → Ca + Cl<sub>2</sub>11001(2004) A proton has which of the following charges?10001Negative001Neutral001Positive11001Magnetic001(2004) A substance made up of two or more elements that have been chemically combined is called —10001an atom001a compound11001an element001a mixture001ENERGY10001mmm001mmm001mmm11001mmm001<img src="29-4.png" alt="29-4.png" title="29-4" width="350" height="239" style="float: right;"></img>(2004) The location on the track where the train has the <em>greatest</em> potential energy is —10001111001200130014<br /><br />001(2004) Which system shows a transformation from chemical to electrical and light energy?10001A car battery causes the headlights to shine.11001A candle burns and lights up the room.001A display of fireworks in the night sky.001An avalanche rolls down a steep mountain.001(2004) Convection is the result of —10001currents caused by the motion of heated molecules11001increases in the density of solids001colder portions of liquids rising001the lack of heat transfer001(2004) Electric bills are calculated based on the amount of energy consumed. The consumption is measured in units of —10001newton meters001millijoule seconds001megavolt minutes001kilowatt hours11001(2004) Which diagram best shows the reflection of light?10001<img src="45a.png" alt="45a.png" title="45a" width="184" height="130"></img>001<img src="45b.png" alt="45b.png" title="45b" width="184" height="127"></img>001<img src="45c.png" alt="45c.png" title="45c" width="202" height="117"></img>001<img src="45d.png" alt="45d.png" title="45d" width="254" height="124"></img>11001<img src="42-4.png" alt="42-4.png" title="42-4" width="337" height="186" style="float: right;"></img>(2004) Both light bulbs are lit in the circuit above. In order to turn off both lights, a switch must be installed in the circuit at the place marked —10001111001200130014001<img src="1-4.png" alt="1-4.png" title="1-4" width="314" height="159" style="float: right;"></img>(2004) In order to turn on the light, a piece of wire needs to be connected from —10001A to C001A to D11001B to C001C to D001<img src="12-4.png" alt="12-4.png" title="12-4" width="351" height="146" style="float: right;"></img>(2004) The area that shows the amplitude of the wave is —10001100120013110014001(2004) A group of people were concerned about a new coal-burning power plant that might be built in their neighborhood. What is probably their main concern?10001Burning coal produces more heat than burning wood.001The heat from burning coal can drive generators that produce electricity.001Burning coal produces sulfur dioxide which contributes to acid rain.11001There is more coal in the earth than there is oil and gas.001(2004) The quality of air is monitored by the government to determine whether a city needs to take steps to control air pollution. To best measure air quality, the air should be tested —10001once a year on a day with very little vehicle traffic001once a day during rush hour when the most cars are on the road001several times a day in all kinds of weather11001at night when the air is probably less polluted001SPACE10001SS11001SS001SS001SS001(2004) Which of these would be the best model to use to study the cause of the moon’s phase changes?10001<img src="18a.png" alt="18a.png" title="18a" width="188" height="113"></img>11001<img src="18b.png" alt="18b.png" title="18b" width="168" height="100"></img>001<img src="18c.png" alt="18c.png" title="18c" width="144" height="101"></img>001<img src="18d.png" alt="18d.png" title="18d" width="186" height="107"></img>001(2004) Which of these planets in the solar system was the most recently discovered?10001Mars001Venus001Jupiter001Pluto11001(2004) Which of these has the <em>most</em> influence on ocean tides?10001The magnetic field of the Earth001Gravity between the Earth and the moon11001Radiation from the sun001Electrical forces in the atmosphere001(2004) The force that holds the planets in orbit around the sun is called —10001motion001friction001pressure001gravity11001(2004) Which of these resources would give the most current, complete and accurate information on planets?10001Planet website by Round Rock Middle School001The NASA website11001A set of general encyclopedias001A science book about the planets001(2004) Which body in the solar system usually contains an atmosphere?10001An asteroid001A planet11001A meteor001A comet001ECOSYSTEMS10001GG11001GG001GG001GG001<img src="40-4.png" alt="40-4.png" title="40-4" width="260" height="279" style="float: right;"></img>(2004) The picture shows a pond ecosystem. What would <em>most likely </em>happen if all the lily plants were removed from this community?10001There would be more oxygen in the air.001The pond water currents would be slower.001There would be more kinds of animals in the pond.001The animals would have fewer places to hide.<br /><br /><br />11001(2004) In which of the following environments would you expect to find the greatest number of different species of plants and animals per square mile?10001An island near the South Pole001A wheat field in North Dakota001A pasture on a Virginia farm001A tropical rain forest in Panama11001(2004) Which of the following are characteristics of the most productive ecological environment?10001Stable temperatures and high rainfall amounts11001Hot temperatures and low rainfall amounts001Cold temperatures and low rainfall amounts001Low temperatures and high rainfall amounts001(2004) Which biome contains large populations of grazing herbivores, few species of birds, and deep, rich soil?10001A taiga001A tundra001A deciduous forest001A grassland11001(2004) How are humans classified within a food chain?10001Producers001Consumers11001Decomposers001Manufacturers001<img src="49.png" alt="49.png" title="49" width="342" height="241" style="float: right;"></img>(2004) In this food web, which organism has the greatest number of food sources?10001Snake001Hawk11001Shrew001Mouse<br /><br /><br />001<img src="9-4.png" alt="9-4.png" title="9-4" width="269" height="281" style="float: right;"></img>(2004) In the food web shown, which of the following consumers eats only producers?10001Hawk001Owl001Fox001Mouse<br /><br /><br /><br /><br />11001(2004) Which of the following is produced as a result of photosynthesis?10001Heat001Water001Oxygen11001a mixture001(2004) A plant’s green color is due to the presence of which organelle?10001Chloroplast11001Nucleus001Mitochondrion001Vacuole001<img src="41-4.png" alt="41-4.png" title="41-4" width="322" height="230" style="float: right;"></img>(2004) The sea urchin shown has radial symmetry. This means that its body parts are —10001equally arranged around a central point11001designed to function in seawater001likely to be reformed if any part of the body is damaged001able to function on land and in the water001(2004) Ranchers historically have used genetics to produce new varieties of cattle. Buffalo can tolerate both hot and cold temperatures but have meat that is not as tasty and tender as beef. Cattle that are subjected to severe temperature extremes produce meat that is neither tender nor good-tasting. What good qualities might a “beefalo” (cross between cattle and buffalo) possess?10001Animals that tolerate heat and cold but do not have good-tasting meat001Animals with good-tasting meat but not tolerance to heat001Animals that tolerate heat and cold and have good-tasting meat11001Animals that tolerate cold but do not have good-tasting meat001(2004) Which of these is due entirely to inheritance in humans?10001Reading skill001Eye color11001Endurance001Broken bones001<img src="21-4.png" alt="21-4.png" title="21-4" width="370" height="50"></img><br />(2004) What is next in this series?10001Habitats001Organisms001Systems11001Organelles001<img src="44-4.png" alt="44-4.png" title="44-4" width="260" height="320" style="float: right;"></img>(2004) According to this graph, which of these is most important in developing the biomass of these plants?10001Nitrates001Sulfates11001Magnesium001Iron<br /><br /><br /><br />001(2004) Lions usually live in prides made up of a few adult females, an adult male, and some younger lions. The females hunt together and the kill is shared with the pride. The lions’ method of hunting <em>best </em>illustrates —10001cooperation11001competition001territoriality001parasitism001(2004) Which of these has the greatest influence over how big a baby elephant will grow?10001The amount of oxygen in the air001The amount of food available11001The size of the trees in the jungle001The type of grass on the plains001<img src="5-4.png" alt="5-4.png" title="5-4" width="250" height="306" style="float: right;"></img>(2004) Which of these species would be <em>most </em>in danger of becoming extinct if one of their food sources became unavailable?10001Brown bear001Panda11001Polar bear001Black bear<br /><br /><br /><br /><br />001
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