Fluid Mechanics
Two fluids are flowing through two similar pipes of the same diameter. The Reynold's number is same. For the same flow rate if the viscosity of a fluid is reduced to half the value of the first fluid, the pressure drop will

Remain unchanged
Data insufficient to predict relative pressure drop
Decrease
Increase

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Fluid Mechanics
Shear stress in a fluid flowing in a round pipe

Varies parabolically across the cross-section
Is zero at the centre and varies linearly with the radius
Is zero at the wall and increases linearly to the centre
Remains constant over the cross-section

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Fluid Mechanics
In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of

Relative roughness
All of these
Absolute roughness
Friction co-efficient for flows at equal Reynold number

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