Deck 5: Water Treatment and Pollution Control

Question 1

Which of the following option is incorrect about the sludges?

A)Sludges are soft, loose and slimy precipitate
B)They are non-adherent deposits and can be easily removed
C)Formed generally at heated portions of the boiler
D)Can be removed by blow down operation

Answer 1

Formed generally at heated portions of the boiler

Question 2

The propulsion of water into steam drum by extremely rapid, almost explosive boiling of water at the heating surface is called ___________

A)Foaming
B)Priming
C)Corrosion
D)Caustic embrittlement

Answer 2

Priming

Question 3

The phenomenon during which the boiler material becomes brittle due to accumulation of caustic substances is known as ___________

A)Foaming
B)Priming
C)Corrosion
D)Caustic embrittlement

Answer 3

Caustic embrittlement

Question 4

Foaming is caused by the formation of ___________

A)Acids
B)Alcohols
C)Oils and alkalis
D)Ketones

Question 5

The term 'Sullage' refers to:

A)Fresh wastewater
B)Septic wastewater
C)Wastewater from kitchen, laundry
D)Toxic wastewater

Question 6

Wastewater can become septic by the loss of:

A)Dissolved oxygen content
B)Carbon content
C)Organic compounds
D)Water content

Question 7

Which one of the below is not an attribute of drinking water?

A)Aesthetics
B)Economic
C)Safety
D)Source

Question 8

The extent of water treatment depends on how many factors?

A)5
B)2
C)3
D)4

Question 9

What is added to the water treatment tank to settle the colloidal particles?

A)Alum
B)Alum and lime
C)Lime
D)Potash

Question 10

Disinfection of water in our country is mainly done by ____________

A)Oxygenation
B)Hydration
C)Chlorination
D)Filtration

Question 11

Which minerals and in what form are present in ground water?

A)Fe & Mn in Ferrous and Manganous
B)Fe & Cu in Ferric and Cupric
C)Fe & Mn in Ferric and manganous
D)Cu & Mn in Cuprous and manganous

Question 12

How many types of wastewater treatment plants are there based on the type of wastewater?

A)5
B)4
C)2
D)3

Question 13

On how many conditions does the intervention of wastewater depend on?

A)5
B)7
C)6
D)4

Question 14

The surface water quality is affected by _______ and infiltration from rainfall.

A)Precipitation
B)Run off
C)Wetlands
D)Farming

Question 15

_________ are constructed for water supply, electricity generation, recreation, irrigation and others.

A)Swimming pools
B)Ponds
C)Reservoirs
D)Tanks

Question 16

What is the next step after water abstraction in wastewater treatment?

A)Supply to consumers
B)Treatment
C)Combine with stormwater
D)Supply to receiving body

Question 17

Which of the following requires aesthetically pleasant water?

A)Domestic use
B)Industrial use
C)Irrigation
D)Aquaculture

Question 18

The addition of substances or energy forms that directly or indirectly alter the nature of the water body is called?

A)Water contamination
B)Water pollution
C)Sanitation
D)Water treatment

Question 19

What is the type of pollution where the pollutants reach the water body in points called?

A)Point-source pollution
B)Diffuse pollution
C)Point-source contamination
D)Diffuse contamination

Question 20

What percentage of solids does wastewater contain?

A)0.5%
B)5%
C)0.1%
D)1%

Question 21

What is the growth of huge amounts of algae and other aquatic plants leading to the deterioration of the water quality called?

A)Eutrophication
B)Algae growth
C)Nitrification
D)Denitrification

Question 22

The optimum temperature for bacterial activity is in what range?

A)25-35 degree Celsius
B)50 degree Celsius
C)20 degree Celsius
D)40 degree Celsius

Question 23

The fluoride concentration for prevention of dental caries is ____________

A)1mg/l
B)2mg/l
C)3mg/l
D)4mg/l

Question 24

In which process, the fluoride content of water is raised?

A)Chlorination
B)Fluoridation
C)Defluoridation
D)Flocculation

Question 25

Which of the following is not used as a fluoride compound?

A)Sodium fluoride
B)Sodium silico fluoride
C)Hydrofluosilicic acid
D)Sodium fluro carbonate