More viscous oil is used in summer than in winter in motors due to

rise in temperature in summer, the viscosity of oil increases.

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rise in temperature in summer, the viscosity of oil decreases.

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surface tension of oil decreases.

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surface tension of oil increases.

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Solution

The correct option is C rise in temperature in summer, the viscosity of oil decreases.
Due to rise in temperature viscosity of oil decreases in summers. So more viscous oils are used for better lubricant protection.

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5 \times 10^{- 3} m^{2} / s

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