Reynolds number and critical velocity

1. A.
   $\frac{2d\rho v}{\eta}$
2. B.
   $\frac{d\rho v}{\eta}$
3. C.
   $\frac{d\rho v}{2\eta}$
4. D.
   $\frac{2\eta}{dv\rho}$

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1. A.
   inversely proportional to '$\eta$'
2. B.
   directly proportional to '$\eta$'
3. C.
   directly proportional to 'd'
4. D.
   directly proportional to '$\rho$'

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1. A.
   be streamline.
2. B.
   be turbulent.
3. C.
   change from streamline to turbulent flow.
4. D.
   be sometimes turbulent and sometimes streamline.

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