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.
Subtopic:  Viscosity |
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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. \(Mg\)
Subtopic:  Viscosity |
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A viscous liquid flows slowly through a pipe of cross-sectional radius \(R.\) The speed of the particles is a function of the distance from the axis of the pipe.
                   
Assume that the flow is smooth. The variation of \(v\) vs \(r\) is best given by the graph:
1. 2.
3. 4.
Subtopic:  Viscosity |
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Please attempt this question first.
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