Question

If Aluminium : Anodisation :: Glazing : X, which of the following choices represent X?

• A. Hard coating
• B. External cement plastering
• C. Tempering
• D. Free-standing vertical greening

Hint:

For analogy questions in construction materials, always match the material with the process used to enhance its durability, strength, or surface protection.

Answer 1

The Correct Option is A, C

The question presents an analogy: a material paired with a surface-modification process that enhances its properties. Aluminium is commonly treated by anodisation, a process that increases surface hardness, corrosion resistance, and durability. This means X should similarly be a process that improves the surface performance of glazing (glass).

Glazing, which refers to glass used in buildings, often requires treatments to increase its mechanical and functional performance. Hard coating is used on glazing to improve scratch resistance, enhance durability, and provide protection from environmental exposure. This coating forms a protective layer on the glass surface, similar to how anodisation protects aluminium.

Another major process applied to glazing is tempering. Tempering involves heating the glass to high temperatures and then rapidly cooling it, increasing its strength by several times compared to ordinary glass. Tempered glazing also breaks into small blunt pieces, improving safety. This strengthening of material properties is analogous to how anodisation strengthens aluminium surfaces.

In contrast, external cement plastering has nothing to do with glass surface treatment—it is for walls. Similarly, free-standing vertical greening refers to landscaping and has no relation to glazing. Therefore, the two correct processes analogous to anodisation for glazing are hard coating and tempering.

Final Answer: Hard coating and Tempering