Question

With increase in temperature the viscosity of

• A. liquids increases and of gases decreases
• B. liquids decreases and of gases increases
• C. both liquids and gases increases
• D. both liquids and gases decreases

Answer 1

Answer: (B)

liquids decreases and of gases increases

The former effect causes a decrease in the shear stress while the latter causes it to increase. The result is that liquids show a reduction in viscosity with increasing temperature. With high temperatures, viscosity increases in gases and decreases in liquids, the drag force will do the same.