Question

As per the Municipal Solid Waste Management Manual by the Central Public Health and Environmental Engineering Organisation (CPHEEO) published in 2016, which of the following is/are listed in the 3R principles?

• A. Recover
• B. Recycle
• C. Reduce
• D. Repair

Hint:

The 3R principle is Reduce, Reuse, Recycle; check each option against that exact three-word set, not against wider waste-management terms like Recover or Repair.

Answer 1

The Correct Option is B, C

Step 1: Recall what the 3R principle stands for in solid waste management.
The CPHEEO Municipal Solid Waste Management Manual, 2016, like most solid waste management frameworks worldwide, promotes the "3R" principle as a hierarchy for managing waste sustainably. The three R's are Reduce, Reuse, and Recycle, in that order of preference: first cut down waste generation, then reuse what is generated wherever possible, and only then recycle what cannot be reused.

Step 2: Match each option to this list.
"Reduce" appears directly in the 3R principle, it means minimizing the amount of waste generated at the source, so option (C) is correct.
"Recycle" also appears directly in the 3R principle, it means processing waste materials to recover usable raw material for making new products, so option (B) is correct.

Step 3: Rule out the terms that are not part of the 3R principle.
"Recover" is a separate waste management term, energy or material recovery from waste that cannot be recycled. It is used in broader waste hierarchies, sometimes called 4R or 5R frameworks, but it is not one of the three words in the specific 3R principle, Reduce, Reuse, Recycle.
"Repair" is likewise not part of the 3R terminology used in the CPHEEO manual. It is sometimes discussed under circular economy or right-to-repair ideas, but it is not one of the 3R's.

Final Answer:
Only Recycle and Reduce are the two 3R terms present among the given options; Reuse itself is not listed as an option here.
\[ \boxed{\text{Recycle and Reduce, options 2 and 3}} \]