1) What is the speed of light in air or in a vaccum? a) 3x10⁸ km h-¹ b) 2.8x10⁸ km h-¹ c) 3x8¹⁰ m s-¹ d) 3x10⁸ m s-¹ 2) What is the relative density of Mercury? a) 4.8 b) 13.6 c) 8.4 d) 8400 3) What is the S.I. unit of pressure? a) Pascal b) Newton c) Horsepower d) Watt 4) What is the melting point of copper? a) 1058°F b) 1085°C c) 1058°C d) 997°C

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