31. In motors, more viscous oil is used in summer than in winter due to (A) the rise in temperature in summer, the viscosity of oil decreases. (B) the rise in temperature in summer, the viscosity of oil increases. (C) the decrease in surface tension of oil. (D) the increase in surface tension of oil
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A is the correct answer of ur question
Explanation:
In motors, more viscous oil is used in summer than in winter due to the rise in temperature in summer, the viscosity of oil decreases.
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