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

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