UPSC Prelims 2020 – Question 78

by Edukemy Team March 1, 2024

Here is Question No. 78 a part of our series on UPSC Prelims 2020

Table of Contents

Select the correct answer using the code given below:
(a) 1, 2 and 3 only
(b) 2, 3, and 4 only
(c) 4 and 5 only
(d) 1 and 5 only

Answer: A

Statement 1 is correct: Copper slag is a byproduct obtained during smelting and refining of copper. The waste copper slag can be used as abrasive tools, road construction, and ballast. The use of copper slag in cement and concrete provides potential environmental as well as economic benefits for all related industries, particularly in areas where a considerable amount of copper slag is produced.
Statement 2 is correct: Cold asphalt mix is produced by mixing unheated mineral aggregate with either emulsified bitumen or foamed bitumen. cold asphalt mix does not require any heating of aggregate which makes it economical and relatively pollution-free (no objectionable fumes or odors).
Statement 3 is correct: Geotextile is a synthetic permeable textile material used to improve soil characteristics and has the ability to separate, filter, reinforce, protect and drain when used in association with soils. It is mostly used for filtration and separation in road construction.
Statement 4 is not correct: Hot Mix Asphalt (HMA) is a combination of approximately 95% stone, sand, or gravel bound together by asphalt cement, a product of crude oil. The wide use of hot mix technology leads to environmental pollution as these plants emit a huge amount of greenhouse gases.
Statement 5 is not correct: Portland Cement is an important construction ingredient around the world, and as a result, cement production is a significant source of global carbon dioxide (CO2) emissions.

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