1000+ Environmental Engineering Multiple Choice Questions & Answers Pdf - 2

Question: 6

Temporary hardness in water is caused by the presence of

(A) chlorides of Ca and Mg

(B) bicarbonate of Ca and Mg

(C) sulphates of Ca and Mg

(D) nitrates of Ca and Mg

Question: 7

Bacteria that need oxygen to live are known as

(A) pathogenic bacteria

(B) facultative bacteria

(C) anaerobic bacteria

(D) aerobic bacteria

Question: 8

Suspended impurities in water is

(A) algae

(B) bacteria

(C) silts

(D) all of these

Question: 9

A timber dam is a

(A) detention dam

(B) rigid dam

(C) non-rigid dam

(D) non-overflow dam

Question: 10

Stone ware pipes are

(A) specially suited to pressure pipes

(B) hydraulically efficient because of their smooth interior surface

(C) highly impervious

(D) highly resistant to sulphide corrosion