UPSC Prelims 2015— Question 58

Correct answer: Option C. Coking coal is essential for conventional blast-furnace steelmaking because it provides both heat and a reducing environment and produces coke with the required physical properties. India has historically needed to import significant quantities of high-quality coking coal because domestic availability and quality have been insufficient for all requirements. Saltpetre and rock phosphate are not the relevant imported input for this process. Option-wise analysis: Option A: “saltpetre” is incorrect. It does not match the specific fact, definition, institutional role, geographical association, or constitutional/economic principle required here. The key distinction is the one identified in the core explanation, so this option can be eliminated. Option B: “rock phosphate” is incorrect. It does not match the specific fact, definition, institutional role, geographical association, or constitutional/economic principle required here. The key distinction is the one identified in the core explanation, so this option can be eliminated. Option C: “coking coal” is correct. It directly matches the factual or conceptual requirement tested by the question and is supported by the principle explained above. Option D: “All of the above” is incorrect. It does not match the specific fact, definition, institutional role, geographical association, or constitutional/economic principle required here. The key distinction is the one identified in the core explanation, so this option can be eliminated. Prelims takeaway: Focus on the precise institutional role, constitutional provision, geographical association, or technical definition being tested. UPSC questions often place a broadly familiar fact beside a narrowly incorrect qualifier; identifying that qualifier is essential for elimination.