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Q.

The cross sectional area of a horizontal tube increases along its length linearly, as we move in thedirection of flow. The variation of pressure, as we move along its length in the direction of flow (x-direction), is best depicted by which of the following graphs.

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a

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b

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c

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d

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answer is D.

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Detailed Solution

Area is increasing.
Therefore v will decrease. 

According to Bernoulli’s equation pressure will increase.

As the area is increasing linearly, the velocity will decrease linearly.

Hence the pressure will increase exponential.

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