Question

As per the National Building Code of India 2016, match the types of glass in Group-I with their corresponding descriptions in Group-II.

Group-I		Group-II
P	Reflective glass	1	Prefab unit of glass having an edge seal that binds the individual sheets together
Q	Tempered fire-resistant glass	2	Glass into which a wire mesh is embedded during production
R	Insulating glass units	3	Rolled glass having a distinct pattern on one or both sides
S	Wired glass	4	Glass with metallic coating reducing heat gain and glare and allowing optimum visible light transmission inside
		5	Glass that breaks into granular fragments, with no large sharp edges

• A. P - 5, Q - 4, R - 3, S - 2
• B. P - 4, Q - 2, R - 1, S - 3
• C. P - 4, Q - 5, R - 1, S - 2
• D. P - 1, Q - 5, R - 4, S - 3

Hint:

Match each glass type by its defining keyword: reflective = coating for heat and glare, tempered = granular breakage, insulating glass unit = sealed prefab unit, wired = embedded mesh.

Answer 1

The Correct Option is C

Step 1: Identify Reflective glass (P).
Reflective glass carries a thin metallic or metal-oxide coating on its surface. The coating cuts down heat gain and glare from the sun while still letting a controlled, optimum amount of visible light pass into the room, matching description 4. So P pairs with 4.

Step 2: Identify Tempered fire-resistant glass (Q).
Tempered (toughened) glass is made by a controlled heating and rapid cooling process that puts the surface into compression. When it does break, it shatters into small blunt granular pieces instead of long dangerous shards, which is description 5, so Q pairs with 5.

Step 3: Identify Insulating glass units (R).
An insulating glass unit (IGU) is a factory-made, sealed assembly of two or more glass sheets held apart by a spacer, with an edge seal joining the sheets into one prefabricated unit, matching description 1. So R pairs with 1.

Step 4: Identify Wired glass (S).
Wired glass has a square wire mesh cast into the glass during rolling, which is exactly description 2 (a wire mesh embedded during production), so S pairs with 2.

Step 5: Rule out the leftover option.
Description 3 (rolled glass with a distinct surface pattern) describes patterned or figured glass, which is not one of the four terms listed in Group-I, so it is left over.

Final Answer:
The full match is P - 4, Q - 5, R - 1, S - 2, which is option (C).
\[ \boxed{P-4,\ Q-5,\ R-1,\ S-2} \]