Question two: Choose the correct answer from a $,$ b$,$ c and d

$1-$ Which of the following is called as the waste water from different sources like bathrooms, kitchens, and washbasins?

a$-$ Discharge

b$-$ Sullage

c$-$ Garbage

d$-$ Sewage

$2-$ the dissolved oxygen concentration with the increase in temperature of the water

a$-$ Decreases

b$-$ Increases

c$-$ Remains the same

d$-$ Increases then decreases

$3-$ Total solids in a wastewater consist of insoluble solids alone

a$-$ True

b$-$ False

$4-$ Which of the following is not a volatile organic compound?

a$-$ Formaldehyde

b$-$ Hydrochloric acid

c$-$ Acetaldehyde

d$-$ Dichloromethane

$5-$ The alkalinity of waste water is ranging from dotsdotsdotsdotsm$\frac{g}{l}$ as $CaC{O}_3$ :

a$-,400-500$

$\frac{1}{2}$

b$-,300-350$

c$-200-250$

d$-500-550$