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The viscosity of an oil decrease when temperature ________(a) Decreases(b) Is constant(c) Increases(d) 100^oCThe question was asked in a national level competition.Query is from Viscosity and Viscosity Index in division Lubricants of Applied Chemistry

Answer»

Correct OPTION is (C) Increases

The explanation: The viscosity of an oil decreases with an increase of the temperature. In internal combustion ENGINES and aeroplanes, the engine must start at LOW temperature and as well they must be operated at high TEMPERATURES. So, the viscosity of an oil must be moderate.



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