In rural road construction, the use of which of the following is preferred for ensuring environmenta

Q: What is UPSC Prelims?

UPSC Prelims is a competitive examination conducted in India. This question is from the 2020 UPSC Prelims Environment & Ecology paper.

Q: How can I prepare for UPSC Prelims Environment & Ecology?

To prepare for UPSC Prelims Environment & Ecology, practice previous year questions (PYQs), understand concepts thoroughly, and solve mock tests regularly. This 2020 question covers Sustainable Development & Green Economy topic.

Q: What is the difficulty level of this question?

This UPSC Prelims 2020 Environment & Ecology question has a hard difficulty level.

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Question

In rural road construction, the use of which of the following is preferred for ensuring environmental sustainability or to reduce carbon footprint?Copper slagCold mix asphalt technologyGeotextilesHot mix asphalt technologyPortland cementSelect the correct answer using the code given below:

Accepted Answer

Correct Answer: A — 1, 2 and 3 onlyStep-by-step Solution:Environmentally sustainable road construction practices include:1. Copper slag: Yes. Using industrial waste (copper slag) as aggregate reduces mining and waste disposal problems. ✓2. Cold mix asphalt technology: Yes. Unlike hot mix, it does not require heating of aggregates, reducing energy consumption and emissions. ✓3. Geotextiles: Yes. They separate soil layers, improve drainage, and reduce the need for additional materials. ✓4. Hot mix asphalt: No. Requires high energy heating, increasing carbon footprint. ✗5. Portland cement: No. Cement production is energy‑intensive and emits large amounts of CO₂. ✗Why other options are incorrect:Option B (2,3,4): Hot mix is not sustainable.Option C (4,5): Both are energy‑intensive.Option D (1,5): Cement is not preferred.Key Concept: Cold mix technology is gaining traction under the Pradhan Mantri Gram Sadak Yojana (PMGSY) for rural roads. It also reduces dependence on fossil fuels and is cost‑effective.

In rural road construction, the use of which of the following is preferred for ensuring environmental sustainability or to reduce carbon footprint?Copper slagCold mix asphalt technologyGeotextilesHot mix asphalt technologyPortland cementSelect the correct answer using the code given below:

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In rural road construction, the use of which of the following is preferred for ensuring environmental sustainability or to reduce carbon footprint?Copper slagCold mix asphalt technologyGeotextilesHot mix asphalt technologyPortland cementSelect the correct answer using the code given below:

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