Question

Viscosity decreases with increase in temperature is the reason for
(i) Hot water moving faster than cold water
(ii) More viscous oils are used in motor cars during summer than in winter.

• A. Only (i) is correct
• B. Only (ii) correct
• C. Both (i) and (ii) are correct
• D. Both are wrong

Answer 1

Answer: (C)

Both (i) and (ii) are correct

The viscosity of water also decreases with temperature, which means that there is lesser resistance to flow at higher temperatures

Since in summer temperature is high so we use more viscous oil.