UPSC CSE 2020 · PYQ · Sustainable Development · medium
In rural road construction, the use of which of the following is preferred for ensuring environmental sustainability or to reduce carbon footprint? 1. Copper slag; 2. Cold mix asphalt technology; 3. Geotextiles; 4. Hot mix asphalt technology; 5. Portland cement. Select the correct answer using the code given below:
A.1, 2 and 3 only✓ Correct
B.4 and 5 only
C.2, 3 and 4 only
D.1 and 5 only
Explanation
Copper slag (waste material), cold mix asphalt (no heating required), and geotextiles are eco-friendly options. Hot mix asphalt and Portland cement have higher carbon footprints.
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