# Cleaning is done by _____ ? with Answer - Civil Engineering Mcqs | TestPrep

> Solved MCQ: Cleaning is done by _____ ? Correct Answer: 1) scraping and removal in filters slow sand2) back washing in slow sand filters3) scraping and removal in filters rapid sand4) back washing in rapid sand filters. Verified answer explanation for FPSC, PPSC, MDCAT, NTS, and CSS competitive exam preparation.

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# Cleaning is done by _____ ?

Direct Answer & Quick Reference

The correct option is **1) scraping and removal in filters slow sand2) back washing in slow sand filters3) scraping and removal in filters rapid sand4) back washing in rapid sand filters**.

A. (1) and (2)

B. (2) and (3)

C. (1) and (4)

D. (2) and (4)

✨ Explain with AI

Verified Key: 1) scraping and removal in filters slow sand2) back washing in slow sand filters3) scraping and removal in filters rapid sand4) back washing in rapid sand filters
Solved by 3,560+ students

Verified against official examination board answer keys and standard curriculum textbooks.

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