Olete.in – MCQs, Mock Tests & Government Job Prep | Civil Engineering Environmental Engineering MCQ

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

✅ Correct Answer: 4

Water obtained from _____ is generally known as sub surface water.

1. Artesian wells
2. Reservoirs
3. Rivers
4. Rains

✅ Correct Answer: 1

Which one of the following is not a type of tube well?

1. Strainer well
2. Slotted well
3. Cavity well
4. Gravity welll

✅ Correct Answer: 4

Which one of the following is not a dissolved impurity of water

1. Iron oxide
2. Bacteria
3. Carbon dioxide
4. Calcium carbonate

✅ Correct Answer: 2

Which one of the following is not turbidity test on water?

1. Hehner's method
2. Nephelometer
3. Baylis
4. Jackson's

✅ Correct Answer: 1

Water with maximum alkalinity pH value is

1. 4
2. 7
3. 14
4. 18

✅ Correct Answer: 3

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

✅ Correct Answer: 4

Floatation is a method of water purification by

1. Ion transfer
2. Gas transfer
3. Solid transfer
4. Solute stabilization

✅ Correct Answer: 3

Which one of the following is not a coagulating agent?

1. Aluminium sulphate
2. Copper sulphate
3. Chlorinated coppers
4. Sodium aluminate

✅ Correct Answer: 2

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

✅ Correct Answer: 2

Ground water is usually free from

1. dissolved impurities
2. suspended impurities
3. both suspended and dissolved impurities
4. none of the above

✅ Correct Answer: 2

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

✅ Correct Answer: 3

Which one of the following would contain water with the maximum amount of turbidity?

1. wells
2. rivers
3. oceans
4. lakes

✅ Correct Answer: 2

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

✅ Correct Answer: 2

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

✅ Correct Answer: 2

Bacteria that need oxygen to live are known as

1. pathogenic bacteria
2. facultative bacteria
3. anaerobic bacteria
4. aerobic bacteria

✅ Correct Answer: 4

Suspended impurities in water is

1. algae
2. bacteria
3. silts
4. all of these

✅ Correct Answer: 4

A timber dam is a

1. detention dam
2. rigid dam
3. non-rigid dam
4. non-overflow dam

✅ Correct Answer: 2

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

✅ Correct Answer: 1

detention dam

1. algae
2. rigid dam
3. non-rigid dam
4. non-overflow dam

✅ Correct Answer: 2

Process of killing pathogenic bacteria from water is known as

1. sedimentation
2. disinfection
3. coagulation
4. filtration

✅ Correct Answer: 2

Bacteria that survive in the absence of oxygen are known as

1. anaerobic bacteria
2. aerobic bacteria
3. facultative bacteria
4. pathogenic bacteria

✅ Correct Answer: 1

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

✅ Correct Answer: 1

A pipe sunk into the well to tap underground water is called

1. artesian well
2. open well
3. infiltration well
4. tube well

✅ Correct Answer: 4

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

✅ Correct Answer: 3

All major and important gravity dams are nowadays constructed with

1. concrete
2. earth and rock fill
3. brick masonry
4. stone masonry

✅ Correct Answer: 1

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

✅ Correct Answer: 4

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

✅ Correct Answer: 4

The flowing river water in natural drainage gets cleaned by

1. photosynthesis
2. self purification
3. oxidation
4. none of these

✅ Correct Answer: 2

Temporary hardness of water may be removed by

1. De-ionization method
2. Zeoloite process
3. Lime soda process
4. Boiling

✅ Correct Answer: 4

Winter rainfall in Tamil Nadu is mainly due to

1. orographic precipitation
2. precipitation due to turbulent ascent
3. cyclonic precipitation
4. convective precipitation

✅ Correct Answer: 2

Depletion of ozone layer in the outer atmosphere may causes

1. heart disorder
2. bronchitis
3. skin cancer
4. lung cancer

✅ Correct Answer: 3

In sewers the effect of scouring is more on

1. horizontal side
2. top side
3. bottom side
4. all sides

✅ Correct Answer: 3

A commonly used handpump is

1. axial flow pump
2. centrifugal pump
3. rotary pump
4. reciprocating pump

✅ Correct Answer: 4

Turbidity is measured on

1. platinum cobalt scale
2. standard platinum scale
3. standard cobalt scale
4. standard silica scale

✅ Correct Answer: 4

pH value of water indicates

1. acidity of alkalinity
2. turbidity
3. turbidity
4. turbidity

✅ Correct Answer: 1

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

✅ Correct Answer: 3

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

✅ Correct Answer: 2

Permanent hardness of water can be removed by

1. adding alum
2. adding chlorine
3. boiling
4. lime soda process

✅ Correct Answer: 4

Which one of the following causes cumulative poisoning by water?

1. lead
2. iron
3. barium
4. manganese

✅ Correct Answer: 1

Meyer's and Rohwer's formula are used to determine.

1. evaporation
2. average rainfall over a basin
3. transpiration
4. precipitation

✅ Correct Answer: 1

Colorimetric method of testing water is to determine

1. turbidity
2. hardness
3. chlorides
4. pH value

✅ Correct Answer: 4

The most common and universal coagulant used in water works is

1. magnesium sulphate
2. calcium sulphate
3. chlorine
4. aluminium sulphate

✅ Correct Answer: 4

Rainwater of the locality which flows in sewer is called

1. subsoil water
2. storm water
3. combined sewage
4. sullage

✅ Correct Answer: 2

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

✅ Correct Answer: 3

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

✅ Correct Answer: 2

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

✅ Correct Answer: 2

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

✅ Correct Answer: 4

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

✅ Correct Answer: 4

Sphere shaped bacteria are called

1. trichobacteria
2. cocci
3. bacilli
4. spirilla

✅ Correct Answer: 2

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

✅ Correct Answer: 1

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

✅ Correct Answer: 2

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

✅ Correct Answer: 3

The chemical most commonly used to increase speed of sedimentation of sewage is

1. lime
2. sodium permanganate
3. sodium permanganate
4. sodium permanganate

✅ Correct Answer: 1