Three tubes $A, B$ and $C$ are connected to a horizontal pipe in which liquid is flowing. The radii of pipe at the joints of $A, B$ and $C$ are $2 c m, 1 c m$ and $2 c m$ respectively. The height of liquid :

in A and B is equal

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in A is maximum

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in A and C is same

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is same in all three

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Solution

The correct option is C in A and C is same
The tubes A and C are connected to a tube of same area of cross-section and the liquid flowing there will have same velocity, hence the height of liquid in A and C will be same. Since, tube B is connected to a tube of smaller area of cross-section, therefore the liquid is flowing faster in the tube and pressure there is less according to Bernoulli's theorem.

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