Waste Water Engineering MCQs

Option A: 5 cm

Option B: 10 cm

Option C: 15 cm

Option D: 20 cm

Correct Answer: 5 cm ✔

Option A: 2 hours

Option B: 3 hours

Option C: 4 hours

Option D: 5 hours

Correct Answer: 4 hours ✔

Option A: Velocity of flow

Option B: Viscosity of water

Option C: Size and shape of solid

Option D: All the above

Correct Answer: All the above ✔

Option A: 0.30 m/sec

Option B: 0.35 m/sec

Option C: 0.40 m/sec

Option D: 0.45 m/sec

Correct Answer: 0.45 m/sec ✔

Option A: House sewer

Option B: Lateral sewer

Option C: Branch sewer

Option D: Sewer outfall

Correct Answer: Sewer outfall ✔

Option A: CO

Option B: SO2

Option C: CO2

Option D: O3

Correct Answer: CO ✔

Option A: 100 cm

Option B: 120 cm

Option C: 140 cm

Option D: 160 cm

Correct Answer: 160 cm ✔

Option A: Turbidity

Option B: Colour

Option C: Odour

Option D: All the above

Correct Answer: All the above ✔

Option A: Alkaline

Option B: Acidic

Option C: Highly decomposed

Option D: A source of objectionable odour

Correct Answer: Alkaline ✔

Option A: Average demand

Option B: Twice the average demand

Option C: Thrice the average demand

Option D: Four times the average demand

Correct Answer: Thrice the average demand ✔

Option A: Potassium permanganate

Option B: Sulphuric acid and napthamine

Option C: Phenol-di -sulphuric acid potassium hydroxide

Option D: None of these

Correct Answer: Sulphuric acid and napthamine ✔

Option A: Magnetic compass

Option B: Theodolite

Option C: Level

Option D: Clinometer

Correct Answer: Level ✔

Option A: 213.5 cm/sec

Option B: 313.5 cm/sec

Option C: 413.5 cm/sec

Option D: 500 cm/sec

Correct Answer: 313.5 cm/sec ✔

Option A: Kinchling

Option B: Lloyd Davis

Option C: Frubling

Option D: All the above

Correct Answer: All the above ✔

Option A: Leaping weir

Option B: Overflow weir

Option C: Siphon spill way

Option D: None of these

Correct Answer: Siphon spill way ✔

Option A: 10 cm

Option B: 12 cm

Option C: 15 cm

Option D: 18 cm

Correct Answer: 15 cm ✔

Option A: Full depth

Option B: Half full

Option C: Two third full

Option D: Three fourth full

Correct Answer: Half full ✔

Option A: [(100 + P1)/(100 – P2)] V1

Option B: [(100 – P1)/(100 + P2)] V1

Option C: [(100 – P1)/(100 – P2)] V1

Option D: [(100 + P2)/(100 – P1)] V1

Correct Answer: [(100 – P1)/(100 – P2)] V1 ✔

Option A: Anaerobic decomposition

Option B: Aerobic decomposition

Option C: Parasitic decomposition

Option D: None of these

Correct Answer: Anaerobic decomposition ✔

Option A: Chezy

Option B: Manning

Option C: Bazin

Option D: Kutter

Correct Answer: Manning ✔

Option A: 100 mg/l

Option B: 200 mg/l

Option C: 300 mg/l

Option D: 400 mg/l

Correct Answer: 300 mg/l ✔

Option A: Both A and R are true and R is the correct explanation of A

Option B: Both A and R are true but R is not a correct explanation of A

Option C: A is true but R is false

Option D: A is false but R is true

Correct Answer: Both A and R are true and R is the correct explanation of A ✔

Option A: Industrial sewage

Option B: Domestic sewage

Option C: Storm water

Option D: Inclusive of domestic and industrial sewage but excludes storm water

Correct Answer: Storm water ✔

Option A: Nitrites

Option B: Nitrates

Option C: Free ammonia

Option D: Aluminoid nitrogen

Correct Answer: Nitrates ✔

Option A: Silting

Option B: Low discharge

Option C: Greasy and oily matters

Option D: All the above

Correct Answer: All the above ✔

Option A: House sewer

Option B: Lateral sewer

Option C: Intercepting sewer

Option D: Main sewer

Correct Answer: House sewer ✔

Option A: 1 in 60

Option B: 1 in 100

Option C: 1 in 120

Option D: None of these

Correct Answer: 1 in 120 ✔

Option A: From low lying areas

Option B: From flat areas

Option C: From basements

Option D: All the above

Correct Answer: All the above ✔

Option A: Water test

Option B: Ball test

Option C: Mirror test

Option D: All of these

Correct Answer: All of these ✔

Option A: Centrifugal pump

Option B: Reciprocating pump

Option C: Pneumatic ejector

Option D: None of these

Correct Answer: Centrifugal pump ✔

Option A: 20% of the design discharge

Option B: Slightly less than 5% of the design discharge

Option C: Slightly more than 5% of the design discharge

Option D: None of these

Correct Answer: Slightly less than 5% of the design discharge ✔

Option A: Size

Option B: Shape

Option C: Weight

Option D: None of these

Correct Answer: None of these ✔

Option A: Should be sunk by 20 cm

Option B: Should be kept 20 cm above the adjacent portion

Option C: Should be sunk by 50 cm

Option D: Need not be sunk

Correct Answer: Should be sunk by 50 cm ✔

Option A: 0.68 m

Option B: 0.88 m

Option C: 1.36 m

Option D: 1.76 m

Correct Answer: 1.36 m ✔

Option A: Kgs

Option B: Joules

Option C: Newtons

Option D: Watts

Correct Answer: Watts ✔

Option A: 3 ppm

Option B: 4 ppm

Option C: 5 ppm

Option D: 10 ppm

Correct Answer: 4 ppm ✔

Option A: Alum

Option B: Ferric chloride

Option C: Ferric sulphate

Option D: Chlorinated copperas

Correct Answer: Ferric chloride ✔

Option A: 1/4

Option B: 1/3

Option C: 1/2

Option D: 3/4

Correct Answer: 1/3 ✔

Option A: Screening

Option B: Skimming

Option C: Filtration

Option D: None of these

Correct Answer: Skimming ✔

Option A: Velocity of flow

Option B: Diameter of the sewer

Option C: Discharge

Option D: All the above

Correct Answer: All the above ✔

Option A: 1 day

Option B: 2 days

Option C: 3 days

Option D: 5 days

Correct Answer: 5 days ✔

Option A: One hour

Option B: Two to three hours

Option C: Three to four hours

Option D: Six hours

Correct Answer: Three to four hours ✔

Option A: 100 cm

Option B: 110 cm

Option C: 120 cm

Option D: 150 cm

Correct Answer: 120 cm ✔

Option A: Invert level of a branch sewer is more than 60 cm that of the main sewer

Option B: Sewer line runs along a main road

Option C: Ordinary manhole cannot be built

Option D: Two sewer lines intersect

Correct Answer: Invert level of a branch sewer is more than 60 cm that of the main sewer ✔

Option A: Carbon dioxide

Option B: Hydrogen

Option C: Ammonia

Option D: All the above

Correct Answer: All the above ✔

Option A: House sewers

Option B: Lateral sewers

Option C: Branch sewers

Option D: Main sewers

Correct Answer: House sewers ✔

Option A: Anaerobic bacteria

Option B: Aerobic bacteria

Option C: Both types of bacterias

Option D: None of these

Correct Answer: Anaerobic bacteria ✔

Option A: Minimum flow

Option B: Maximum flow

Option C: Both A. and B.

Option D: None of these

Correct Answer: C. Both A. and B. ✔

Option A: D8/3 = 4 b8/3

Option B: D3/8 = 4 b3/8

Option C: D2/3 = 4 b2/3

Option D: D3/2 = 4 b3/2

Correct Answer: D8/3 = 4 b8/3 ✔

Option A: The change of gradient

Option B: The change of direction

Option C: The junctions of sewers

Option D: All of these

Correct Answer: All of these ✔

Option A: In freshly produced sewage

Option B: At sewer pipes

Option C: In sewer treatment plants

Option D: None of these

Correct Answer: In freshly produced sewage ✔

Option A: Screening

Option B: Sedimentation

Option C: Oxidation

Option D: All the above

Correct Answer: All the above ✔

Option A: 0.5 to 1.0 kg

Option B: 1 kg to 2.0 kg

Option C: 5 kg to 7.5 kg

Option D: 7.5 kg to 10 kg

Correct Answer: 0.5 to 1.0 kg ✔

Option A: 1 in 60

Option B: 1 in 100

Option C: 1 in 120

Option D: None of these

Correct Answer: 1 in 60 ✔

Option A: Hydrochloric acid

Option B: Sulphuric acid

Option C: Nitric acid

Option D: Citric acid

Correct Answer: Sulphuric acid ✔

Option A: House sewer

Option B: Out-fall sewer

Option C: Branch sewer

Option D: Main sewer

Correct Answer: Out-fall sewer ✔

Option A: Hydrogen sulphide

Option B: Carbon dioxide

Option C: Methane

Option D: Oxygen

Correct Answer: Hydrogen sulphide ✔

Option A: Carbondioxide

Option B: Hydrogen sulphide

Option C: Methane

Option D: All of these

Correct Answer: All of these ✔

Option A: 100 to 500

Option B: 500 to 1000

Option C: 1000 to 1500

Option D: 1500 to 2000

Correct Answer: 500 to 1000 ✔

Option A: D²

Option B: D²

Option C: D²

Option D: D²

Correct Answer: D² ✔

Option A: Flushing

Option B: Cane rodding

Option C: Wooden pills

Option D: None of these

Correct Answer: Flushing ✔

Option A: Hydrogen sulphide (H2S)

Option B: Carbon dioxide (CO2)

Option C: Methane (CH4)

Option D: All the above

Correct Answer: All the above ✔

Option A: 1/3

Option B: 0/2

Option C: 0/3

Option D: 2 /3

Correct Answer: 2 /3 ✔

Option A: More than the rate of water supply

Option B: Equal to the rate of water supply

Option C: Less than the rate of water supply

Option D: At 150 litres per capita

Correct Answer: At 150 litres per capita ✔

Option A: 10.0

Option B: 5.0

Option C: 2.0

Option D: 0.25

Correct Answer: 0.25 ✔

Option A: R.C.C.

Option B: P.C.C.

Option C: Cast iron

Option D: Glazed stonewares

Correct Answer: Glazed stonewares ✔

Option A: 2.25

Option B: 2.50

Option C: 2.55

Option D: 2.65

Correct Answer: 2.65 ✔

Option A: Parabolic shaped

Option B: Horse shoe shaped

Option C: Egg shaped

Option D: Circular shaped

Correct Answer: Horse shoe shaped ✔

Option A: R.C.C.

Option B: Glazed stone wares

Option C: Asbestos cement

Option D: Glazed ware

Correct Answer: Glazed ware ✔

Option A: Surface loading

Option B: Overflow rate

Option C: Overflow velocity

Option D: All of these

Correct Answer: All of these ✔

Option A: Size

Option B: Shape

Option C: Weight

Option D: None of these

Correct Answer: None of these ✔

Option A: Settleable solids

Option B: Suspended solids

Option C: Dissolved solids

Option D: None of these

Correct Answer: Settleable solids ✔

Option A: 10% less

Option B: 20% less

Option C: 10% more

Option D: 20% more

Correct Answer: 20% less ✔

Option A: Silting occurs at bottom

Option B: Scouring occurs at bottom

Option C: Both silting and scouring occur at bottom

Option D: Neither silting nor scouring occurs at bottom

Correct Answer: Neither silting nor scouring occurs at bottom ✔

Option A: 1 –

Option B: 1 –

Option C: ½ (1 –

Option D: ½ (1 –

Correct Answer: 1 – ✔

Option A: Manually

Option B: Mechanically

Option C: Hydraulically

Option D: Electrically

Correct Answer: Manually ✔

Option A: 20 cm

Option B: 25 cm

Option C: 40 cm

Option D: 50 cm

Correct Answer: 50 cm ✔

Option A: Carbon dioxide

Option B: Nitrates

Option C: Sulphates

Option D: All the above

Correct Answer: All the above ✔

Option A: House sewer

Option B: Lateral sewer

Option C: Branch sewer

Option D: All of these

Correct Answer: All of these ✔

Option A: 10 cm

Option B: 12.5 cm

Option C: 15 cm

Option D: 25 cm

Correct Answer: 15 cm ✔

Option A: 0.010

Option B: 0.011

Option C: 0.012

Option D: 0.013

Correct Answer: 0.013 ✔

Option A: Boiling

Option B: Adding potassium permanganate

Option C: Adding sulphuric acid

Option D: Phenol-di-sulphuric acid

Correct Answer: Boiling ✔

Option A: 3 years

Option B: 3.5 years

Option C: 4 years

Option D: 5 years

Correct Answer: 3 years ✔

Option A: Irrigation

Option B: Dilution

Option C: Oxidation

Option D: Purification

Correct Answer: Dilution ✔

Option A: 204 cu.m

Option B: 208 cu.m

Option C: 212 cu.m

Option D: 216 cu.m

Correct Answer: 216 cu.m ✔

Option A: Both A and R are true and R is the correct explanation of A

Option B: Both A and R are true but R is not a correct explanation of A

Option C: A is true but R is false

Option D: A is false but R is true

Correct Answer: Both A and R are true and R is the correct explanation of A ✔

Option A: Degradation

Option B: Active decomposition

Option C: Recovery

Option D: Cleaner water

Correct Answer: Degradation ✔

Option A: 500 litres/km/cm

Option B: 1000 litres/km/cm

Option C: 1500 litres/km/cm

Option D: 2000 litres/km/cm

Correct Answer: 2000 litres/km/cm ✔

Option A: Industrial areas

Option B: Large town ships

Option C: Hilly town ships

Option D: Cities in plains

Correct Answer: Hilly town ships ✔

Option A: Sanitary sewage

Option B: Storm sewage

Option C: Surface water

Option D: Ground water

Correct Answer: Sanitary sewage ✔

Option A: 1 in 60

Option B: 1 in 80

Option C: 1 in 10

Option D: 1 in 400

Correct Answer: 1 in 60 ✔

Option A: 6

Option B: 7

Option C: 5

Option D: 6.5

Correct Answer: 5 ✔

Option A: D

Option B: 1.25 D

Option C: 1.5 D

Option D: 1.75 D

Correct Answer: D ✔

Option A: 1 minute

Option B: 2 minutes

Option C: 3 minutes

Option D: 5 minutes

Correct Answer: 1 minute ✔

Option A: 1.5

Option B: 2.0

Option C: 2.5

Option D: 3.0

Correct Answer: 2.0 ✔

Option A: D

Option B: D /2

Option C: D/3

Option D: D/4

Correct Answer: D ✔

Option A: 5 – 10 years

Option B: 15 – 20 years

Option C: 30 – 40 years

Option D: 40 – 50 years

Correct Answer: 15 – 20 years ✔

Option A: Fit for discharge into any open drain

Option B: Foul and contains dissolved and suspended solids

Option C: As good as that from a complete treatment

Option D: None of these

Correct Answer: Fit for discharge into any open drain ✔

Option A: A particle to travel along its length

Option B: A particle to travel from top surface to bottom sludge zone

Option C: The flow of sewage to fill the tank

Option D: None of these

Correct Answer: The flow of sewage to fill the tank ✔

Option A: Liquid waste

Option B: Sullage

Option C: Sewage

Option D: None of these

Correct Answer: Sewage ✔