The percentage of suspended solid waste in raw water is removed by coagulation is__________________?
(A) 60
(B) 70
(C) 80
(D) 90
Which one of the following makes the bulk of hydrospheres content ?
(A) oceans
(B) glaciers & icecaps
(C) fresh water lakes and ponds
(D) All have equal distribution
The main pollutant of leather tanneries in the waste water is____________________?
(A) chromium III
(B) chromium IV
(C) chromium V
(D) chromium VI
Which of the following solutions of H2SO4 is more concentrated ?
(A) 1 Molar solution
(B) 1 molal solution
(C) 1 normal solution
(D) all have same concentration
Ozone hole is substantial depletion of ozone in every year during__________________?
(A) Aug – Nov
(B) Sep – Nov
(C) Nov – Dec
(D) Dec – Jan
Which of the following is used as water disinfectant to avoid the formation of toxic compounds_________________?
(A) Cl2
(B) O3
(C) ClO2
(D) both B & C
Chlorination of water may be harmful if the water contains_________________?
(A) Ammonia
(B) Dissolved oxygen
(C) Carbon dixide
(D) All