Extracted text: 5. When depth of flow is more than critical depth, it is called as: a) Supercritical flow b) Subcritical flow 6. Vena contracta is the point in a fluid stream. Which of the following conditions are true for Vena contracta: a) Subcritical depth b) Diameter of stream is least c) Velocity is maximum 7. Lacey's theory is applicable to: a) Rigid boundary channels carrying sediment-laden water b) Loose boundary channels carrying sediment-laden water c) Loose boundary channels carrying sediment free water