Molecular Theory & Factors
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:
Show answer and solution
Answer: (b)
- A: False. Extra energy belongs to molecules at the surface, not the interior.
- B: False. Viscosity of a liquid decreases as temperature rises.
- C: True. Viscosity of a gas increases with temperature.
- D: True. Reynolds number decides the onset of turbulence. E: True. Streamlines never cross in steady flow.
- So the answer is (b) C, D, E only.