Fluid Mechanics
The pressure drop per unit length of pipe incurred by a fluid 'X' flowing through pipe is Δp. If another fluid 'Y' having both the specific gravity & density just double of that of fluid 'X', flows through the same pipe at the same flow rate/average velocity, then the pressure drop in this case will be

2Δp
Δp²
Δp/2
Δp

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Fluid Mechanics
A stream line is

Always the path of particle
A line connecting the mid points of flow cross-section
Fixed in space in steady flow
Drawn normal to the velocity vector at every point

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