Question

Water falls from a tap, down the streamline

• A. Area decreases
• B. Area increases
• C. Velocity remains same
• D. Area remains same

Answer 1

The correct option is A

Area decreases

Explanation for correct option:

1. When water falls from a faucet, the streamline area decreases due to an increase in liquid velocity as it experiences gravity, i.e., by the equation of continuity.
2. Equation of continuity is written as $A_1{v}_1=A_2{v}_2$.
3. Area decreases as velocity increases.
4. The continuity equation states that the product of the pipe's cross-sectional area and fluid speed at any point along the pipe is always constant.
5. This product is equal to the flow rate or volume flow per second.

Hence,Option(A) is correct.