Civil Engineering - Environmental Engineering

Question - 1

An ideal horizontal flow settling basin is 3m deep having surface area 900m2 . Water flows at the rate of 8000 m3/d, at the water temperature 200 C (). Assuming stokes law to be valid. The percentage of spherical sand particles (0.01 mm diameter and specific. gravity 2.65) That will be removed is

  • A 32.5
  • B 67
  • C 87.5
  • D 95.5

Question - 2

Chlorine gas used for disinfection combines with water to form hypochlorous acid (HOCl). The hypochlorous acid ionises to form hypochlorite ion (OCl-) in a reversible reaction.
\(HOCI\rightleftharpoons H^{ + }+OCI^{ - }\quad (K=2.7\times 10^{ -8 }\quad AT\quad 20^{ 0 }C\)
The equilibrium of which is governed by pH. The sum of HOCL and OCI- is known as free chlorine residuals. The 90% fraction of HOCL in the chlorine residual is available at a pH value

  • A 4.8
  • B 6.6
  • C 7.5
  • D 9.4

Question - 3

The amount of bleaching powder containing 20% available chlorine needed to chlorinate a rural water supply covering a population of 10000 at 50L/cd at rate of ppm is

  • A 1 kg
  • B 5 kg
  • C 0.2 kg
  • D 20 kg

Question - 4

Polluated water is one, which

  • A contains pathogenic bacteria
  • B contains undesirable matter, making it unfit drinking and domestic use
  • C is contaminated
  • D is safe for drinking, but possess problems in special industries

Question - 5

When the mode of measurement of turbidity is the adsorption of light the measuring apparatus is called a

  • A spectometer
  • B tintometer
  • C tubiditymeter
  • D nephetometer

Question - 6

One true colour unit is the colour produced by

  • A one mg of formazin in one litre of distilled water
  • B one mg of silicon in one litre of distilled water
  • C one mg of chloroplatinate ions in one litre of distilled water
  • D one mg of ferric silicon in one litre of distilled water

Question - 7

The composition of a certain MSW sample and specific weights of its various compnents are given below 

component % by weight Specific weight (kg/m3)
Food  50 300
Dirt and Fish  30 500
Plastics 10 65
Wood and Yard Waste 10 125

Specific weight of MSW sample is 

  • A 319
  • B 217
  • C 209
  • D 199

Question - 8

50 g of CO2 and 25 g of CH4 are produced from decomposition of MSW with a formula weight of 120 g. What is averagge per capita green house gas production in a city of 1 million people? With MSW production rate 500 ton / day.

  • A 104 g/day
  • B 120 g/day
  • C 208 g/day
  • D 313 g/day

Question - 9

Which of the following materials are used as land fills sealants for the control of gas and leachate movements?
1.Lime
2.Sand
3.Bentonite
4.Fly ash
5.Butyl rubber
Select the correct answer using codes.

  • A 1,2 and 3
  • B 4 and 5
  • C 3 and 5
  • D 1, 2 and 4

Question - 10

Which one of the following  method can be employed for plastic and rubber disposal?

  • A Compositing
  • B  Incineration  
  • C Pyrolysis  
  • D Landfill
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