In your own understanding, what is the difference between petrology and geology ? How does this affect the civil engineers?

Please give the applications and significance of Hydrostatic Pressure. Also give real world examples that a civil engineering would face.

What are the applications and significants of jet of water impinging on solid flat and curved surfaces. Give real world civil engineering examples.

For One thousand one hundred seventy-four concrete sleepers, rail length equal One thousand five hundred centimeters, needed for construct railway track of length Eight hundred kilometers using standard gauge, the structural number or density factor (X) most nearly?