Question

Consider the following statements: Surface tension arises due to extra energy of the molecules at the interior as compared to the molecules at the surface of a liquid. As the temperature of liquid rises, the coefficient of viscosity increases. As the temperature of gas increases, the coefficient of viscosity increases. The onset of turbulence is determined by Reynolds number. In a steady flow, two streamlines never intersect. Choose the correct answer from the options given below:

• A. A, B, C Only
• B. C, D, E Only
• C. B, C, D Only
• D. A, D, E Only

Hint:

When analyzing fluid dynamics, remember that Reynolds number is crucial for determining the nature of flow (laminar or turbulent).

Answer 1

The Correct Option is D

Step 1: Statement A is true. Surface tension occurs due to excess molecular energy at the surface. 
Step 2: Statement B is incorrect. As the temperature of a liquid increases, the coefficient of viscosity decreases. 
Step 3: Statement C is true. As the temperature of a gas increases, the coefficient of viscosity increases. 
Step 4: Statement D is true. Reynolds number determines whether the flow is laminar or turbulent. 
Step 5: Statement E is true. In a steady flow, streamlines do not intersect. Final Conclusion: The correct statements are A, D, and E, which corresponds to Option (4).