Air is blown through a pipe AB at a rate of 15 L/min. The cross-sectional area of the wide portion of the pipe AB is 2 cm2 and that of the narrow portion is 0.5 cm2. The difference in water level h is:(ρair=1.3kg/m3)

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16 mm

1.55 mm

10 mm

3.2 mm

answer is B.

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Detailed Solution

V=A1V1=A2V2 V=A1V1 15×10-360=2×10-4V1 v1=1.25m/s----(1) V=A2V2 15×10-360=0.5×10-4V2 v2=5m/s----(2) P1-P2=12ρairv22-v12 hρwg=12×1.3v22-v12 h998.710=12×1.352-1.252 h=1.55mm

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