4. Explain the concept of load-bearing structures. (3 marks) 5. What are the different types of loads considered in structural engineering? (3 marks) 6. Describe the difference between tensile and compressive stress. (3 marks) 7. Explain the significance of the modulus of elasticity in materials. (3 marks) 8. What is the importance of factor of safety in design? (3 marks) 9. Describe the working principle of a truss. (3 marks) 10. Explain the concept of bending moment and shear force in beams. (4 marks)