The correct statement about the variation of viscosity of fluids with an increase in temperature is:
| 1. | viscosity of gases decreases. | 
| 2. | viscosity of both liquids and gases increases. | 
| 3. | viscosity of liquids increases. | 
| 4. | viscosity of liquids decreases. | 
The velocity of a small ball of mass \(M\) and density \(d\), when dropped in a container filled with glycerine becomes constant after some time. If the density of glycerine is \(d\over 2\) then the viscous force acting on the ball will be:
| 1. | \(\frac{3Mg}{2}\) | 2. | \(2Mg\) | 
| 3. | \(\frac{Mg}{2}\) | 4. | \(Mg\) | 

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