Grade 8 Science Part 2. 2005 Released Test. A. The south pole of one magnet is attracted to both poles of the other magnet. B. The north pole of one magnet is attracted to the north pole of the other magnet.
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A. The south pole of one magnet is attracted to both poles of the other magnet. B. The north pole of one magnet is attracted to the north pole of the other magnet. C. The south pole of one magnet is attracted to the north pole of the other magnet. D. The south pole of one magnet is attracted to the south pole of the other magnet. 26. Which of the following is a truestatement about the magnetic fieldbetween two magnets?
A. They had offspring of a different species. B. They mutated to other species. C. They never really existed. D. They became extinct. 27. What most likely happened to species that are found in the fossil record but have no living members ?
A. The number of hydrogen atoms in each molecule of ammonia B. The number of nitrogen and hydrogen atoms in each molecule of ammonia C. The number of ammonia molecules that will bond together D. The number of nitrogen atoms in each molecule of ammonia 29. In the chemical formula for ammonia, NH3, what does the subscript 3 represent?
A. The rotation of the Sun B. The revolution of the Earth C. The revolution of the Sun D. The rotation of the Earth 31. Which of the following causes the Sun to appear to set?
A. its chemical reactions produce heat B. evaporation causes an object to heat up C. its magnetic field produces a large amount of heat D. current passing through it produces heat 32. An electric light bulb is hot to the touch because —
A.The number of snakes would increase. B. The number of grass plants would decrease. C. The number of songbirds would decrease. D. The number of hawks would increase. 33. In a food chain, the numbers of each type of population are usually in a relatively stable combination. If humans interfered by spraying an insecticide to kill the insects, what would be the next thingthat would happen?
A. A triple-beam balance B. A graduated cylinder C. A spring scale D. An electronic light meter 34. Which instrument would mostaccurately and precisely determinethe mass of a toy car?
A. number of valence electrons in the element carbon B. number of neutrons in the element carbon C. atomic mass of the element carbon D. atomic number of the element carbon 36. The diagram below shows a block from the periodic table. The number six represents the —
A. Many other students recorded data similar to hers. B. Another student in her class reached a different conclusion. C. The same experiment was repeated two years in a row. D. Three other classes performed the same experiment. 37. Each student in a science class of 25 conducts the same experiment. One student gathers all the data from her classmates and summarizes the results. She compares the data she personally recorded with the class data. Which of these might indicate to her that herresults are valid?
A. increased use of insecticides B. seasonal changes C. a major climatic change D. increases in human population 38.Thrips are tiny insects that can easily be seen on roses. The thrip population changes shown in the graph above are probably caused by —
A. heating the mixture B. using a magnet C. performing a chemical reaction D. placing the mixture in water 39. A mixture of iron filings and sulfur can easily be separated by —
A. 3,800 m B. 380 m C. 0.38 m D. 3.8 m 40. A student designs and builds a 1:1000 scale model of the Mt. Fuji volcano in Japan. Since Mt. Fuji is about 3,800 m high, what is the height of his scale model?
