Deck 1: Water Quality and Demand Measurements

Question 1

Suspended solids are measured by which of the following?

A)turbidity rod
B)gravimetric test
C)chromatography
D)jackson's turbidity meter

Answer 1

gravimetric test

Question 2

The maximum permissible limit for suspended solids is________                

A)10 mg/l
B)20 mg/l
C)30 mg/l
D)40 mg/l

Answer 2

30 mg/l

Question 3

Identify the correct relation between the following?

A)dissolved solid = total solid + suspended solid
B)dissolved solid = total solid - suspended solid
C)total solid = dissolved solid / suspended solid
D)dissolved solid = suspended solid - total solid

Answer 3

dissolved solid = total solid - suspended solid

Question 4

Which method is used to measure the color of water?

A)gravimetric analysis
B)chromatography
C)tintometer method
D)hydrometer analysis

Question 5

1 TCU (True Color Unit) is equivalent to

A)the color produced by 1 g of platinum cobalt
B)the color produced by 1 mg of platinum cobalt
C)the color produced by 1 mg of platinum cobalt in 1l of distilled water
D)the color produced by 1 mg of platinum cobalt in 1ml of distilled water

Question 6

Threshold odour number testing is preferred in hot water.

Question 7

One JTU is equivalent to turbidity produced by________            

A)1mg of fine silica dissolved in 1l of distilled water
B)1g of fine silica dissolved in 1l of distilled water
C)1g of fine silica dissolved in 1ml of distilled water
D)1mg of fine silica dissolved in 1ml of distilled water

Question 8

If the PO value is 6, what does it imply?

A)no perceptible odour
B)very faint odour
C)very distinct odour
D)extremely strong odour

Question 9

The permissible limit of turbidity of domestic water is________ppm.

A)5-10
B)1-5
C)10-50
D)10-30

Question 10

What is the full form of NTU in context with turbidity?

A)number of transfer unit
B)neurological turbidity unit
C)nephelometric turbidity unit
D)network terminal unit

Question 11

When depth of insertion of turbidity rod increases, the reading in the turbidity rod________   

A)decreases
B)increases
C)first decrease, then increase
D)remains constant

Question 12

The average quantity of water (in lpcd) required for domestic purposes according to IS code is________        

A)100
B)120
C)70
D)135

Question 13

The average consumption of water required in factories in lpcd is________              

A)10-15
B)20-30
C)30-45
D)70-80

Question 14

In which type of water demand, minimum average consumption of water takes place?

A)domestic water demand
B)industrial water demand
C)institutional and commercial water demand
D)fire demand

Question 15

Water lost in theft and waste contributes to how much % of total consumption?

A)5
B)10
C)15
D)20

Question 16

What are the factors affecting per capita demand?

A)size of city
B)size of city, habit of people
C)cost of water, quality of water, size of city
D)cost of water, quality of water, size of city, habit of people

Question 17

Which of the following statement is correct?

A)rich class consumes less water
B)intermittent water supplies leads to less water consumption
C)loss of water is more if the pressure in the distribution system is less
D)water consumption is less in flush system

Question 18

If the annual average hourly demand of the city is 10000m³, what is the maximum hourly consumption?

A)2700 m³
B)27000 m³
C)270000 m³
D)2700000 m³

Question 19

If in a city, the maximum daily draft is 25MLD, fire draft is 35MLD and maximum hourly draft is 40MLD, what is the coincident draft?

A)60mld
B)40mld
C)25mld
D)35mld

Question 20

What is the design period for the water treatment unit?

A)10 years
B)15 years
C)20 years
D)30 years

Question 21

What is the design discharge for intake structures?

A)maximum daily demand
B)maximum hourly demand
C)maximum weekly demand
D)average daily demand

Question 22

In which of the following units, design period is maximized?

A)distribution system
B)demand reservoir
C)water treatment unit
D)pipe mains

Question 23

A hydel power project has been envisaged to serve the water supply and irrigation needs of the area at its inception stage. The dam reservoir so constructed is known as

A)multipurpose reservoir
B)single-purpose reservoir
C)distribution reservoir
D)retarding reservoir