Science 30 January 1999 Grade 12 Diploma Examination

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The petroleum industry has a significant environmental and economic impact in Alberta.13. When technologists explore for oil deposits, they pass sound waves throughsedimentary rock to determine the thickness of the layers. As the sound wavestravel from one sedimentary layer to another, their paths are bent. This phenomenais similar to theA. reflection of light by a mirrorB. polarization of light by sunglassesC. amplification of light by a laser sourceD. refraction of light entering water from airUse the following information to answer the next question.Pipeline welders use ethyne (acetylene) as a fuel for “cutting torches.” Thebalanced equation for the combustion of acetylene is2 C 2 H 2(g) + 5 O 2(g) 4 CO 2(g) + 2 H 2 O (g)14. The energy conversion that occurs during this reaction is fromA. chemical to thermal energyB. electrical to thermal energyC. thermal to mechanical energyD. electromagnetic radiation to chemical energy8
15. Sparks from static electricity pose a hazard in petroleum plants. As two chargedobjects separate, the field strength between themA. decreases in proportion to the square of the distance that separates themB. increases in proportion to the square of the distance that separates themC. decreases in proportion to the distance that separates themD. increases in proportion to the distance that separates them16. Electrical fields resemble magnetic and gravitational fields in that they allA. have the same constantB. cause a compass needle to swingC. exert an attractive and repulsive forceD. are affected by the distance between two sources17. Many oil well pumpjacks operate using electric motors. The electricity must betransmitted over long distances because oil wells are often located in remotelocations. Efficient transmission requiresA. high voltage, low current, and AC linesB. low voltage, high current, and AC linesC. low voltage, high current, and DC linesD. high voltage, high current, and DC lines18. In order for the electric motor of an oil well pumpjack to function, voltage andamperage must be changed. This is accomplished through the use ofA. a resistorB. a generatorC. a transformerD. an AC/DC converter9
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Science 30 January 1999 Grade 12 Diploma Examination

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