Science 30 January 2000 Diploma Examination

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7. Because salicylic acid is a weak acid, when mixed with water, its properties include a A. low degree of dissociation in water and a pH of less than 7 B. high degree of dissociation in water and a pH of less than 7 C. low degree of dissociation in water and a pH of greater than 7 D. high degree of dissociation in water and a pH of greater than 7 8. Salicylic acid may be used to form a buffer. The action of a buffer A. increases pH when a base is added to it B. decreases pH when an acid is added to it C. maintains a constant pH when an acid or a base is added to it D. causes large changes in pH when an acid or base is added to it 4
The exploration of space adds to our knowledge of the universe and has produced a number of theories about it. 9. According to the steady state theory and the big bang theory, the universe is expanding. Evidence supporting the theory of an expanding universe is that the electromagnetic radiation collected from distant galaxies A. undergoes red shift B. undergoes blue shift C. is emitted in a wide range of frequencies D. is emitted in a narrow range of frequencies 10. In a recent space shuttle experiment, power was produced by pulling a very long conducting wire behind the shuttle through Earth’s magnetic field. The phenomenon that was being studied likely involved the A. creation of a magnetic field through induction B. interaction of electrical and gravitational fields C. interaction of magnetic and gravitational fields D. creation of an electrical current through induction 11. Objects sent into orbit around Earth are known as artificial satellites. Natural satellites orbiting around planets are known as A. moons B. galaxies C. constellations D. solar systems 5
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Science 30 January 2000 Diploma Examination

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