धारारेखीय प्रवाह या अपरिवर्ती प्रवाह#!#प्रक्षुब्ध प्रवाह (Turbulent Flow)#!#रेनॉल्ड संख्या (Reynolds Number)#!#MCQ

For turbulent flow, the value of Reynolds number is

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The speed at which the flow of water in a long cylindrical pipe of diameter 2 cm becaomes turbulent is (The viscosity of water =1 xx10^(-3) Pa. s and for the onset of turbulent flow in a long cylindrical pipe, Reynolds number =3000)

A glass tube of uniform cross section is connected to a tap with a rubber tube. The tap is opened slowly. Initially the flow of water in the tube is streamline. What should be the speed of fl.ow of water to convert h into a turbulent flow? [Given : radius of the tube=1cm, eta=1xx10^(-3) Pas and Reynold's number=2500]

A lead sphere is steadily is steadily sinking in glycerine whose viscosity is equal to eta=13.9 P.What is the maximum diameter of the sphere at which the flow around that sphere still remains laminar? It is known that the transition to the turbulent flow correspond to reynolds number R_(e)=0.5 . (here the charactrstic length is taken to be the sphere diameter). (in mm)