Top 10 viva/interview questions on total organic and inorganic solids in water and wastewater

Total volatile solids

Total volatile solids are the materials that are completely volatilised from water at higher temperature (550ºC). These solids are often referred to the organic content of the water. 

Total fixed solids

Total fixed solids are the materials which are not volatilized from water at higher temperature (550ºC). These solids are often referred to the inorganic content of the water.

Here are top 10 viva or interview questions on  total organic and inorganic solids in water and wastewater, which are generally asked,

1. The Total Volatile Solids determination is very important in the control of

a) Water treatment plant
b) Sewage treatment plant
c) Desalination plant
d) Effluent treatment plant

2. The crucible with sample, should be placed in the muffle furnace for atleast _______.

a) one hour
b) two hours
c) 20 minutes
d) 10 minutes

3. The Total Fixed Solids is the measure of

a) all the solids present
b) inorganic solids present
c) the salt content
d) organic solids

4. The method used for the determination of solids is _____.

a) volumetric method
b) gravimetric method
c) instrumentation method
d) visual method

5. The crucible after ignition should be cooled in a desiccator

a) because it is hot
b) to avoid moisture absorption
c) to cool
d) to incubate

6. Putrescible solid means

a) pure solids
b) dissolved solids
c) solids with high BOD
d) suspended solids

7. The solid organic matter (sludge) digested by Aerobic treatment.

a) True
b) False

8. The determination of total volatile solids is interfered by

a) Loss of volatile solids during the drying process
b) Large volatile solids water sample
c) Dissolved salts
d) Suspended salts

9. While placing the crucible in muffle furnace it is advisable to wear gloves made of

a) Leather
b) Rubber
c) Resin
d) Polythene

10. The Total Volatile Solids is the measure of

a) all the solids present
b) organic solids present
c) the salt content
d) inorganic salts present

ANSWER KEY:
1) b
2) c
3) b
4) b
5) b
6) c
7) False
8) a
9) a
10) b

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