# Engineering/Civil Engineering -MCQS-Waste Water Engineering - Section 3 Sample Test,Sample questions

1.100

2.1000

3.5000

4.10000

## Question: ``` At the junction of sewers```

1.top of smaller sewer is kept lower

2. top of larger sewer is kept lower

3.tops of both the sewers are at the same level

4.none of these

1.Imhoff Cone

2.turbidimeter

3.potentiometer

4.none of these

1.branch sewers

2.main sewers

3.trunk sewers

4.all the above.

## Question: ``` In circular sewers if depth of flow is 02 times the full depth; the nominal gradient;```

1. is only provided

2.is doubled

3.is trebled

4.is not enough.

## Question: ``` Lead caulked joints are used for laying```

1. stone ware pipes

2.earthern ware pipes

3.C.I. pipes

4.G.I. pipes.

1.10 cm

2.15 cm

3.20 cm

4.25 cm

## Question: `Depletion of ozone layer in the outer atmosphere may cause`

1.lung cancer

2.skin cancer

3.bronchitis

4.heart disorder.

1.1.5

2.2

3.2.5

4.3

1.100 cm

2.90 cm

3.80 cm

4.50 cm

1.30 to 40%

2.40 to 60%

3.60 to 80%

4. 80 to 90%

## Question: `Inter-distance between ventilation columns in a sewer line is kept`

1.25 to 50 m

2. 50 m to 100 m

3.100 m to 150 m

4.150 m to 300 m.

1.equal to 7

2.more than 7

3.less than 7

4.equal to zero.

## Question: `Pick up the correct statement from the following :`

1.The water supply pipes carry pure water free from solid particles

2.The water supply pipes get clogged if flow velocity is less than self cleansing velocity

3.The sewers may be carried up and down the hills and valleys

4.None of these

## Question: `Primary treatment of sewage consists of removal of`

1.large suspended organic solids

2.oil and grease

3.sand and girt

4.none of these

1.rivers

2.seas

3.lakes

4.none of these

1. 0.05552 cumec

2.0.05554 cumec

3.0.0556 cumec

4. 0.0558 cumec.

1.1

2.2 to 3

3.3 to 5

4.5 to 10

## Question: `The factor responsible for purification of sewage in river is`

1.Hydrology

2.Dissolved oxygen in water

3.Temperature

4.Turbulence

1.20 m

2.30 m

3.45 m

4.75 m

1.25%

2.50%

3.10%

4.5%

1.its intensity

2.its direction

3.its frequency

4.all the above.

## Question: `The self-cleansing velocity of water flowing through pipe lines; is`

1.2 metres/sec

2.1 metre/sec

3.0.5 metre/sec

4.0.25 metre/sec.

1.bath rooms

2.wash basins

3.kitchen sinks

4.toilets.

1.2 to 3 mm

2.3 to 5 mm

3.5 to10 mm

4.8 to 10 mm

## Question: `The water carried sewerage system removes`

1.domestic sewage

2. industrial sewage

3.storm sewage

4. all the above.

1.100 m

2.150 m

3.200 m

4.300 m

## Question: `Which one of the following gases is most significant as air pollutant`

1.Carbondioxide

2.Oxygen

3.Nitrogen

4.Sulphurdioxide.

## Question: `Which one of the following part of human body withstands minimum radiation`

1.thyroid

2.kidneys

3.eyes

4.ovaries/testis.

## Question: `Which one of the following statements regarding septic tanks is wrong :`

1.a gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided

2.the outlet invert level is kept 5 to 7.5 cm below the inlet invert level

3. the minimum width of septic level is 90 cm

4.the depth of tank is kept equal to its width

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