18) The pipe may not break due to impact of heavy traffic moving over the road or ground, if it is laid at least _____ below the ground.
Answer is:
100 cm
Related ISRO Technician-B Plumber Question Paper - 2017 (Set - 1) with Answer Key
Answer is:
All of these
Explanation:
Objective of water treatment is
* To remove the dissolved gases
* To remove the unpleasant and objectionable testes and colors from the water
* To eliminate the tuberculation and corrosive properties