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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. |
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