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With respect to rise in temperature, viscosity of liquids:
1. Increase
2. Decrease
3. May increase or decrease
4. Remains unchanged

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Correct Answer - Option 2 : Decrease

The correct answer is option 2, i.e. decreases

  • The relative motion between different layers of liquid or gases is opposed by a force, which is known as the Viscous force and this property is known as Viscosity.
  • SI unit of Viscosity is Decapoise (Kg/ms) or pascal second.
  • The symbol of viscosity is η.ηη
  • Some properties of viscosity are:
    • This is the property of liquids and gases.
    • In the case of liquid, it is seen because of the cohesive force between the molecules of the liquid.
    • In the case of a gas, it is seen because of the diffusion of its molecules from one layer to other layers.
    • The viscosity of gases is very less than that of liquids.
    • No viscosity is there in solids.
    • Viscosity on an ideal fluid is always zero.
    • The viscosity of liquids decreases with the rise in temperature.
    • The viscosity of gases increases with the rise in temperature.

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