Understanding Cement Types and Their Applications

This question requires matching different types of cement (List-I) with their appropriate uses (List-II).

Analysis of Cement Types and Uses

• P. Rapid hardening cement: This cement gains strength much faster than ordinary Portland cement. It is commonly used in situations requiring quick construction or repairs, such as repair of bridges where rapid strength development is crucial. Thus, P matches with 1.
• Q. Quick-setting cement: This type of cement sets very quickly after mixing with water. It is beneficial for concrete under water or in cold weather conditions where early stiffening is desired. Thus, Q matches with 3.
• R. High alumina cement: Known for its high strength, durability, and resistance to chemical attack and high temperatures. It is widely used for making refractory concrete in industries. Thus, R matches with 4.
• S. Low-heat cement: This cement generates less heat during the hydration process compared to ordinary cement. It is ideal for large concrete structures like dams to minimize thermal cracking. Thus, S matches with 2.

Correct Matches Summary

The correct pairings derived from the analysis are:

• P - 1 (Rapid hardening - Repair of bridges)
• Q - 3 (Quick-setting - Concrete under water)
• R - 4 (High alumina - Refractory concrete in industries)
• S - 2 (Low-heat - Dams)

This set of matches corresponds to the following table:

Conclusion: Selecting the Correct Option

Based on the derived matches (P-1, Q-3, R-4, S-2), the correct option is 4.