25. Define surveying and its role in civil engineering. (3 marks) 26. What are the different types of surveying methods? (3 marks) 27. Explain the concept of leveling in surveying. (3 marks) 28. Describe the working principle of a total station. (3 marks) 29. What is GIS (Geographic Information System) and its applications in civil engineering? (3 marks) 30. Explain the concept of remote sensing and its significance. (3 marks) 31. What are the steps involved in the process of land surveying? (3 marks)