Question

Plastics as a material of construction suffer from the drawback of low:

• A. Strength
• B. Density
• C. Machinability
• D. Plastic deformation

Hint:

Plastics are light and versatile, but their \textbf{low mechanical strength} limits structural applications in heavy-duty construction.

Answer 1

The Correct Option is A

Step 1: Nature of Plastics
Plastics are widely used in construction due to: - Low density, - High corrosion resistance, - Easy fabrication, - Good electrical insulation properties. Step 2: Drawback – Low Strength
However, compared to traditional materials like steel, aluminum, and concrete, plastics have: - Much lower tensile and compressive strength, - Poor performance under heavy mechanical loading or structural stress. This limits their use in load-bearing or high-stress applications in construction. Step 3: Elimination of Other Options
- Density: Low density is an advantage, not a drawback. - Machinability: Plastics are generally easy to machine or mold. - Plastic deformation: Plastics typically show large deformation before fracture, which can be useful. Conclusion: The primary structural drawback of plastics in construction is their low strength.