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

1. (1) A, D, E only
2. (2) C, D, E only
3. (3) B, C, D only
4. (4) A, B, C only

Correct answer: (2) C, D, E only

Solution

Statements C, D, and E are correct because the viscosity of gases increases with temperature, turbulence is indeed characterized by the Reynolds number, and in steady flow, streamlines do not intersect, indicating that fluid particles do not cross each other's paths.

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