| 1. Boundary-layer thickness in laminar flow is greater than that of turbulent flow. |
| 2. Boundary-layer thickness of turbulent flow is greater than that of laminar flow. |
| 3. Velocity distributes uniformly in a turbulent boundary-layer. |
| 4. Velocity has a gradual variation in a laminar boundary layer. |
A) 1, 3 and 4 only
B) 1, 2, 3 and 4
C) 1 and 2 only
D) 2, 3 and 4, only
Correct Answer: A
Solution :
Pressure inside a soap bubble, \[p=\frac{8\sigma }{d}\] \[\sigma =\frac{pd}{8}=\frac{25\times 50\times {{10}^{-3}}}{8}=0.156\,\,\text{N/m}\]
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