ENVIRONMENTAL ENGINEERING QUIZ

12 hours

24 hours

1 minute

5 minutes

Minimum at noon

Maximum at noon

Same throughout the day

Maximum at midnight

Highest at pH value equal to 7

Increased at higher pH value of water

Unaffected by pH value of water

Reduced at higher pH value of water

Ultra violet rays treatment

By using potassium permanganate

Lime treatment

Chlorination

anaerobic in lower compartment and aerobic in upper compartment

Aerobic only

Anaerobic only

Aerobic in lower compartment and anaerobic in upper compartment

None of these

Both (A) and (B)

Starch iodide method

Orthotolidine method

0.60 to 1.00 mm

1.00 to 1.80 mm

0.35 to 0.60 mm

0.25 to 0.35 mm

All (i), (ii) and (iii)

Both (i) and (ii)

Only (i)

Both (i) and (iii)

Nitrogen

Methane

Carbon dioxide

Hydrogen sulphide

15 to 30 cm/sec

15 to 30 cm/minute

15 to 30 cm/hour

5 to 10 cm/sec