Honey, air and glycerine all resist flow. Which of the claims I to IV about viscosity, its temperature dependence and Stokes' drag are correct?

• I. The viscosity of a liquid decreases as its temperature rises.
• II. The viscosity of a gas increases as its temperature rises.
• III. The SI unit of the coefficient of viscosity is the pascal second (Pa s).
• IV. In Stokes' law, the viscous drag on a sphere is proportional to the square of its speed.