500 Best Environmental Engineering- MCQ
Q69). The maximum permissible quantity of iron and manganese in water for domestic purposes should be
a).0.1 ppm
b).0.3 ppm
c).0.6 ppm
d).0.8 ppm
Correct Answer:
0.3 ppm
Explanation:
Q70). The pH value of water for public supplies is limited from
a).2.5 to 6.5
b).6.5 to 8
c).8 to 10.5
d).10.5 to 14
Correct Answer:
6.5 to 8
Explanation:
Q71). The maximum permissible quantity of lead in water for domestic supplies is
a).0.01 ppm
b).0.05 ppm
c).0.50 ppm
d).1 ppm
Correct Answer:
0.05 ppm
Explanation:
Q72). The maximum permissible fluorine content in water for domestic supplies should be
a).0.15 ppm
b).1.5 ppm
c).15 ppm
d).150 ppm
Correct Answer:
1.5 ppm
Explanation:
Q73). Sphere shaped bacterias are called
a).Spirilla
b).Bacilli
c).Cocci
d).Trichobacteria
Correct Answer:
Cocci
Explanation:
Q74). B-coli or E-coli are harmless organisms but their presence in water indicates the
a).Presence of pathogenic bacteria
b).Absence of pathogenic bacteria
c).Presence of non pathogenic bacteria
d).Absence of non pathogenic bacteria
Correct Answer:
Presence of pathogenic bacteria
Explanation:
Q75). Membrane filter technique is used for testing
a).E-coli
b).Copper
c).Pathogenic bacterias
d).None of these
Correct Answer:
E-coli
Explanation:
Q76). The bacteria which require oxygen for their survival is known as
a).Anaerobic bacteria
b).Pathogenic bacteria
c).Aerobic bacteria
d).Non pathogenic bacteria
Correct Answer:
Aerobic bacteria
Explanation: