A circular sewer section is preferred to because
1. it provides maximum hydraulic mea depth
2.it provides maximum area for a given perimeter
3.it is cheaper in construction
4.All of the above
Posted Date:-2022-09-22 09:45:59
A commonly used handpump is
1.axial flow pump
2.centrifugal pump
3.rotary pump
4.reciprocating pump
Posted Date:-2022-09-22 10:12:48
A garden developed over top of surface water tank is known as
1.water tank garden
2.hanging garden
3.municipal garden
4.none of these
Posted Date:-2022-09-22 09:17:21
A pipe sunk into the well to tap underground water is called
1.artesian well
2.open well
3. infiltration well
4. tube well
Posted Date:-2022-09-22 09:40:35
A timber dam is a
1.detention dam
2.rigid dam
3. non-rigid dam
4.non-overflow dam
Posted Date:-2022-09-22 09:23:21
Aerosol is
1.diffused liquid particles
2.carbon particles of microscopic size
3.dispersion of small solid or liquid particles in gaseous media
4.finely divided particles of ash
Posted Date:-2022-09-22 09:42:36
All major and important gravity dams are nowadays constructed with
1.concrete
2.earth and rock fill
3. brick masonry
4.stone masonry
Posted Date:-2022-09-22 09:44:34
Bacteria that need oxygen to live are known as
1. pathogenic bacteria
2.facultative bacteria
3.anaerobic bacteria
4.aerobic bacteria
Posted Date:-2022-09-22 09:20:57
Bacteria that survive in the absence of oxygen are known as (B) aerobic bacteria (C) facultative bacteria (D)
1.anaerobic bacteria
2.aerobic bacteria
3.facultative bacteria
4.pathogenic bacteria
Posted Date:-2022-09-22 09:39:08
Bacteria that survive in the absence of oxygen are known as
1.anaerobic bacteria
2.aerobic bacteria
3.facultative bacteria
4.pathogenic bacteria
Posted Date:-2022-09-22 09:32:18
Coli or E. Coli are harmless organisms but their presence in water indicates the
1. Absence of pathogenic bacteria
2.Absence of non pathogenic bacteria
3.Presence of non pathogenic bacteria
4.Presence of pathogenic bacteria
Posted Date:-2022-09-22 08:57:10
Colorimetric method of testing water is to determine
1. turbidity
2.hardness
3.chlorides
4.pH value
Posted Date:-2022-09-22 10:33:54
Cowl is provided at
1. first step in manhole
2.upper end of the manhole
3. lower end of ventilating column
4.upper end of ventilating column
Posted Date:-2022-09-22 09:49:18
Depletion of ozone layer in the outer atmosphere may causes
1.heart disorder
2.bronchitis
3.skin cancer
4.lung cancer
Posted Date:-2022-09-22 10:02:46
detention dam
1.algae
2.rigid dam
3.non-rigid dam
4.non-overflow dam
Posted Date:-2022-09-22 09:28:13
Floatation is a method of water purification by
1.Ion transfer
2.Gas transfer
3.Solid transfer
4.Solute stabilization
Posted Date:-2022-09-22 08:58:28
For an area developed in haphazard way, the type of layout of water distribution system preferred as
1. radial system
2. ring system
3.grid iron system
4. dead end system
Posted Date:-2022-09-22 10:42:41
For trunk and out fall, the type of sewers generally used is
1. circular shaped
2.horse shoe shaped
3.parabolic shaped
4.standard egg shaped
Posted Date:-2022-09-22 10:41:32
Ground water is usually free from
1.dissolved impurities
2.suspended impurities
3. both suspended and dissolved impurities
4.none of the above
Posted Date:-2022-09-22 09:08:38
In a dam project geological investigations are to get information about
1. Structural features of rock such as folds, faults, fissures
2.Type and depth of overburden
3.Water tightness of the reservoir basin
4. All the above
Posted Date:-2022-09-22 02:48:13
In a rapid sand filter
1.Water from sedimentation tank is supplied
2.Water from coagulation tank is supplied
3.Raw water from the source is supplied
4. Any one of the above
Posted Date:-2022-09-22 09:05:39
In sewers the effect of scouring is more on
1.horizontal side
2.top side
3.bottom side
4.all sides
Posted Date:-2022-09-22 10:03:41
In treatment swimming pool water the filtration system to be used is
1.slow sand filters
2.pressure filters
3.rapid sand filters
4. All of the above
Posted Date:-2022-09-22 10:48:35
Meyer's and Rohwer's formula are used to determine.
1.evaporation
2.average rainfall over a basin
3.transpiration
4.precipitation
Posted Date:-2022-09-22 10:32:55
Permanent hardness of water can be removed by
1.adding alum
2.adding chlorine
3.boiling
4. lime soda process
Posted Date:-2022-09-22 10:26:33
pH value of water indicates
1.acidity of alkalinity
2.turbidity
3.turbidity
4.turbidity
Posted Date:-2022-09-22 10:20:48
Process of killing pathogenic bacteria from water is known as
1.sedimentation
2.disinfection
3.coagulation
4.filtration
Posted Date:-2022-09-22 09:30:40
Rainwater of the locality which flows in sewer is called
1.subsoil water
2. storm water
3.combined sewage
4.sullage
Posted Date:-2022-09-22 10:36:59
Sphere shaped bacteria are called
1.trichobacteria
2.cocci
3.bacilli
4.spirilla
Posted Date:-2022-09-22 10:46:19
Stone ware pipes are
1. specially suited to pressure pipes
2.hydraulically efficient because of their smooth interior surface
3.highly impervious
4.highly resistant to sulphide corrosion
Posted Date:-2022-09-22 09:25:27
Suspended impurities in water is
1.algae
2.bacteria
3.silts
4.all of these
Posted Date:-2022-09-22 09:22:06
Temporary hardness in water is caused by the presence of
1.chlorides of Ca and Mg
2.bicarbonate of Ca and Mg
3.sulphates of Ca and Mg
4.nitrates of Ca and Mg
Posted Date:-2022-09-22 09:19:21
Temporary hardness of water may be removed by
1.De-ionization method
2.Zeoloite process
3.Lime soda process
4.Boiling
Posted Date:-2022-09-22 09:57:35
The chemical most commonly used to increase speed of sedimentation of sewage is
1.lime
2.sodium permanganate
3.sodium permanganate
4.sodium permanganate
Posted Date:-2022-09-22 10:52:07
The controlling design parameter in the design of all setting tanks is
1.depth
2.percent removal of suspended solids
3.overflow rate
4.detention time
Posted Date:-2022-09-22 10:22:12
The flowing river water in natural drainage gets cleaned by
1.photosynthesis
2. self purification
3.oxidation
4.none of these
Posted Date:-2022-09-22 09:53:53
The layer on the top of a filtering medium formed by organic impurities is known as
1.dirty skin
2.tube settler
3.permeable layer
4.filtering layer
Posted Date:-2022-09-22 10:47:34
The most common and universal coagulant used in water works is
1. magnesium sulphate
2.calcium sulphate
3.chlorine
4.aluminium sulphate
Posted Date:-2022-09-22 10:35:36
The sewer which obtains its discharge from two or more sewers is known as
1.common sewer
2.common sewer
3.trunk sewer
4.depressed sewer
Posted Date:-2022-09-22 10:50:57
The suitable method for disinfection of swimming pool water is
1.chlorination
2. by using potassium permanganate
3.ultra violet rays treatment
4. lime treatment
Posted Date:-2022-09-22 09:10:29
The suitable method of forecasting population for a young and rapidly increasing city is
1.graphical method
2. incremental increase method
3.geometrical increase method
4. arithmetical increase method
Posted Date:-2022-09-22 10:39:22
Turbidity is measured on
1. platinum cobalt scale
2.standard platinum scale
3.standard cobalt scale
4. standard silica scale
Posted Date:-2022-09-22 10:17:47
Water obtained from _____ is generally known as sub surface water.
1.Artesian wells
2.Reservoirs
3.Rivers
4.Rains
Posted Date:-2022-09-22 02:49:17
Water with maximum alkalinity pH value is
1.4
2.7
3.14
4.18
Posted Date:-2022-09-22 08:55:45
Which one of the following causes cumulative poisoning by water?
1. lead
2.iron
3.barium
4.manganese
Posted Date:-2022-09-22 10:31:19
Which one of the following is not a coagulating agent?
1. Aluminium sulphate
2.Copper sulphate
3.Chlorinated coppers
4.Sodium aluminate
Posted Date:-2022-09-22 09:03:34
Which one of the following is not a dissolved impurity of water
1. Iron oxide
2.Bacteria
3.Carbon dioxide
4.Calcium carbonate
Posted Date:-2022-09-22 08:24:41
Which one of the following is not a type of tube well?
1.Strainer well
2.Slotted well
3.Cavity well
4.Gravity welll
Posted Date:-2022-09-22 02:50:58
Which one of the following is not ground water?
1.from river side radial collector wells
2.from infiltration gallaries
3.water from natural springs
4.rooftop water stored in underground tank
Posted Date:-2022-09-22 10:45:08
Which one of the following is not turbidity test on water?
1.Hehner's method
2.Nephelometer
3. Baylis
4.Jackson's
Posted Date:-2022-09-22 08:27:07
Which one of the following would contain water with the maximum amount of turbidity?
1.wells
2.rivers
3.oceans
4.lakes
Posted Date:-2022-09-22 09:12:52
Winter rainfall in Tamil Nadu is mainly due to
1.orographic precipitation
2. precipitation due to turbulent ascent
3.cyclonic precipitation
4.convective precipitation
Posted Date:-2022-09-22 10:01:34
With self cleansing velocity in sewers
1.With self cleansing velocity in sewers
2.neither silting nor scouring occurs at bottom
3.both silting and scouring occur at bottom
4.scouring occurs at bottom
Posted Date:-2022-09-22 10:24:42
Zero hardness of water is achieved by
1.using excess alum dosage
2.ion exchange method
3.excess lime treatment
4.using lime soda process
Posted Date:-2022-09-22 10:40:26