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Test: Quality Control of Water Supply - 2


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Test: Quality Control of Water Supply - 2 - Question 1

Electrical conductivity (EC) of water and total dissolved solids (TDS) are interrelated. The value of EC will

Detailed Solution for Test: Quality Control of Water Supply - 2 - Question 1

An approximate analysis for TDS is often made by determining the electrical conductivity of the water. The ability of water to conduct electricity is called specific conductance and it is a function of its ionic strength. Unfortunately, specific conductance and concentration of TDS are not related on a one to one basis. Only ionized substances contribute to specific conductance. Organic molecules and compounds that dissolve without ionizing are not measured. Additionally, the magnitude of specific conductance is influenced by the valence of the ions in the solution, their mobility and their relative numbers. The temperature also has an important effect with specific conductance increasing as the water temperature increases. The ions usually accounting for majority of TDS in natural waters are Na, Ca, Mg, HCO-3, SO2-4, Cl-, etc. Hence their presence increases the electrical conductivity of water.

Test: Quality Control of Water Supply - 2 - Question 2

In which one of the following tests is the organic matter in the waste water used as food by microorganisms?

Test: Quality Control of Water Supply - 2 - Question 3

Which one of the following organisms is responsible for enteric fever?

Detailed Solution for Test: Quality Control of Water Supply - 2 - Question 3

Salmonella typhi and Salmonella paratyphi (bacteria) cause enteric fever.
Enteric Cytopathogenic Human Orphan ECHO (virus) cause aseptic meningitis, epidemic exanthem, infantile diarrhoea.
Entamoeba histolytica (protozoa) cause dimebiasis (amebic dysentry, amebic enteritis, amebic colitis). Echmococcus (helminth) cause enchinococcosis (hydlatidosis, granulosis, dog tapeworm).

Test: Quality Control of Water Supply - 2 - Question 4

Presence of nitrogen in a waste water sample is due to the decomposition of

Test: Quality Control of Water Supply - 2 - Question 5

Which of the following cations impart(s) pseudo hardness to water?

Detailed Solution for Test: Quality Control of Water Supply - 2 - Question 5

Monovalent cations impart pseudo-hardness. Hardness is the concentration of multivalent cations.

Test: Quality Control of Water Supply - 2 - Question 6

Match List-l (Equipment) with List-ll (Parameter) and select the correct answer using the codes given below the lists:
List-l
A. Tintometer
B. Nephelometer
C. Imhoffcone
D. Muffle furnace

List-ll
1. Temperature
2. Colour
3. Turbidity
4. Settleable solids
5. Volatile solids

Codes:
     A B C D
(a) 4 3 1 5
(b) 2 5 4 3
(c) 4 5 1 3
(d) 2 3 4 5

Detailed Solution for Test: Quality Control of Water Supply - 2 - Question 6

Nephelometer is based on scattering principle for measurement of turbidity, Ituses formazin, a chemical compound, for standard. Formazin is more reproducible standard than SiO2. Tintometer is a color measuring instrument which compares colour of water in Nessler tubes which contain solutions of platinum Cobalt dissolved in water.

Test: Quality Control of Water Supply - 2 - Question 7

What is the most common cause of acidity in water?

Detailed Solution for Test: Quality Control of Water Supply - 2 - Question 7

CO2 reacts with water to form carbonic acid.

Test: Quality Control of Water Supply - 2 - Question 8

Match List-I (Parameter) with List-ll (Impact) and select the correct answer using the codes given below the lists: List-l
A. Excess sulphates
B. Lack of iodide
C. Excess hardness
D. Excess dissolved oxygen

List-ll 
1. Greater soap consumption
2. Laxative effect
3. Goitre
4. Corrosion of pipes

Codes:
     A B C D
(a) 2 1 3 4
(b) 4 3 1 2
(c) 2 3 1 4
(d) 4 1 3 2

Test: Quality Control of Water Supply - 2 - Question 9

Which one of the following tests of water/ wastewater employs Eriochrome Black T as an indicator?

Test: Quality Control of Water Supply - 2 - Question 10

The maximum permissible limit for fluoride in drinking water is

Detailed Solution for Test: Quality Control of Water Supply - 2 - Question 10

A fluoride concentration of less than 0.8-1.0 ppm may be harmful and may cause dental caries (tooth decay) due to the formation of excessive cavities in the teeth of young children during calcination of their permanent teeth. Higher fluoride concentrations, greater than 1.5 ppm or so, may again be harmful, causing spotting and discolouration of teeth, (a disease called fluorosis), which with continued excessive consumption of fuorides, may even cause deformation of bones.

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