Q10 VSA of 24 Page 73

Streamline flow is more likely for liquids with

Critical velocity is the velocity of the liquid up to which liquid can be streamlined and above which it is turbulent.


It is related to coefficient of viscosity and density as,



Hence, for a streamline flow the critical velocity should be high and hence density should be low and coefficient of viscosity should be high. High coefficient of viscosity indicates high viscosity of a liquid.

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8

A wooden block with a coin placed on its top, floats in water as shown in Fig.10.3. The distance l and h are shown in the figure. After some time, the coin falls into the water. Then

A. l decreases.


B. h decreases.


C. l increases.


D. h increase.



 9

With increase in temperature, the viscosity of

A. gases decrease.


B. liquids increase.


C. gases increase.


D. liquids decrease.


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Is viscosity a vector?

 12

Is surface tension a vector?