Category: Environmental Engineering

A. 4.5 to 6.0
B. 6.5 to 8.0
C. 8.5 to 10.0
D. 10.5 to 12.0

A. less strength
B. difficulty in construction
C. difficulty in transportation due to heavy weight
D. less life

A. 1.5
B. 1.8
C. 2.0
D. 2.7

A. aquifers
B. aquiclude
C. filters
D. intakes

A. 4-8 hours
B. 24 hours
C. 10 to 15 days
D. 3 months

1) scraping and removal in filters slow sand
2) back washing in slow sand filters
3) scraping and removal in filters rapid sand
4) back washing in rapid sand filters
The correct answer is

A. (1) and (2)
B. (2) and (3)
C. (1) and (4)
D. (2) and (4)

A. carbon dioxide
B. bleaching powder
C. sulphur dioxide
D. chloramines

A. circle method
B. equivalent pipe method
C. electrical analysis method
D. Hardy cross method

A. to decrease it
B. to increase it
C. fluctuating
D. nil

A. 0
B. 1
C. infinity
D. none of the above