Which one of the following is true from the given statements?

1. Surface tension of liquids generally increases with temperatures.
2. Viscosity of gases decreases with temperature.
3. For solids with an elastic modulus of rigidity, the shearing force is proportional to the shear strain.
4. For the model of a plane in a wind tunnel, turbulence occurs at a smaller speed than turbulence for an actual plane.

Subtopic:  Properties of Fluids |
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