3) Structural conditions (UNIT 4)

1. Which condition ensures a structure can remain upright without toppling over?

• Rigidity
• Stability
• Resistance
• Flexibility

2. What happens when a structure’s center of gravity lies outside its base?

• It becomes more rigid
• It remains perfectly stable
• It is likely to topple over
• It experiences zero stress

3. The capacity of a structure to bear the forces applied to it without breaking is known as…

• Buckling
• Resistance
• Stability
• Triangulation

4. Which of the following methods increases a structure’s stability?

• Using hollow columns
• Using a narrow and tall design
• Centring the weight in the highest part
• Burying the bottom section in the ground

5. To prevent buckling under compression, columns or beams are often made…

• Very thin and flexible
• Hollow or thick in cross-section
• Suspended by cables
• Lightweight with minimal material

6. Why is triangulation (e.g., a diagonal brace) frequently used in structures?

• To add decorative elements only
• To improve resistance against bending and deformation
• To reduce the overall weight drastically
• To reduce the cost of materials

7. When cables cross each other in a structure (cross-bracing), they primarily contribute to…

• Providing a larger base area
• Improving flexibility
• Improving rigidity against lateral forces
• Decreasing tension in the columns

8. A structure’s rigidity is defined as…

• Its total mass when loaded
• How easily it can bend under a small force
• Its ability to avoid large deformation under load
• Its capacity to distribute weight to the ground

9. Which of the following examples best illustrates buckling?

• A tower leaning slightly to one side
• An overloaded column bending in the middle
• A rope getting stretched at both ends
• A suspension cable twisting in the wind

10. To ensure a structure remains functional even under load, it must maintain…

• Minimal permanent deformation
• High electrical conductivity
• A very tall and narrow shape
• No joints between parts