UPSC CSE Prelims
Question 33
Steel slag can be the material for which of the following?
- Construction of base road
- Improvement of agricultural soil
- Production of cement
Select the correct answer using the code given below
View correct answer and explanation
Correct answer: D
Correct Option: D (l, 2 and 3)
Explanation: Processed steel slag can serve as road-base aggregate, supply calcium-rich material to amend acidic soils and act as a raw material or additive in cement manufacture.
Statement / Pair / Item-wise Analysis:
1. Correct - Steel slag may replace aggregates in road bases after adequate processing and testing.
2. Correct - Lime-rich slag can neutralise acidic soils and supply certain nutrients.
3. Correct - Steel slag can be utilised in cement and blended construction materials.
Option-wise Analysis:
A. Incorrect-omits correct item 3 (Steel slag can be utilised in cement and blended construction materials).
B. Incorrect-omits correct item 1 (Steel slag may replace aggregates in road bases after adequate processing and testing).
C. Incorrect-omits correct item 2 (Lime-rich slag can neutralise acidic soils and supply certain nutrients).
D. Correct-includes all and only valid statements/items 1, 2, 3.
Review note: Environmental leaching and quality control are essential for agricultural applications.