Question

In case of liquid, if Reynold's number '\(R_n\)' is \(1450\), then the flow of liquid will

• A. be streamline.
• B. be turbulent.
• C. change from streamline to turbulent flow.
• D. be sometimes turbulent and sometimes streamline.

Hint:

Between about 1000 and 2000 the flow is unstable and changes from streamline to turbulent.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
The Reynolds number \(R_n\) tells whether the flow of a liquid is smooth or turbulent.

Step 2: Ranges used in the Maharashtra Board text:
For \(R_n < 1000\) the flow is streamline. For \(1000 < R_n < 2000\) the flow is unsteady and changes from streamline to turbulent. For \(R_n > 2000\) the flow is turbulent.

Step 3: Apply:
\(R_n = 1450\) lies between 1000 and 2000, so the flow is in the transition range, where it changes from streamline to turbulent.

Step 4: Why the other options are wrong.
Option (A) would need \(R_n\) below 1000. Option (B) would need \(R_n\) above 2000. Option (D) does not describe a standard classification.

Final Answer:
The flow changes from streamline to turbulent, option (C). \[ \boxed{\text{Changes from streamline to turbulent (C)}} \]