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Statement (I): In areas where extreme cold conditions are a regular feature, and more so particularly in winter, it is necessary to use lighter oil for automobiles than in summer. Statement (II): ‘Lighter’ in statement (I) refers to the oil density, which may be adjusted by admixtures.

Statement (I): In areas where extreme cold conditions are a regular feature, and more so particularly in winter, it is necessary to use lighter oil for automobiles than in summer. Statement (II): ‘Lighter’ in statement (I) refers to the oil density, which may be adjusted by admixtures. Correct Answer Statement (I) is true<strong>;</strong> but Statement (II) is false

Statement I: True

The cause of viscosity in liquids is the intermolecular force of attraction or cohesive forces. On increasing the temperature the intermolecular force of attraction decrease and hence, the viscosity of liquids reduces. This implies that viscosity of the liquid is inversely proportional to temperature.

In extremely cold conditions, the temperature is very low which in turn increases the viscosity of oil to a very large extent in such a way that oil almost becomes gel-like or very thicken due to increase in the intermolecular force of attraction. Thick oils could not flow easily. Therefore, we need to use lighter oils to prevent engine failure in extremely cold conditions because lighter oils have less viscosity.

Statement-II: False

Lighter oils refer to low viscous oils.  

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