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What is ETP ?

Effluent Treatment Plant cleans industrial effluents, contaminated water from rivers and lakes, and so on just in order to reuse the water for additional purposes.

What is STP ?

Sewage Treatment Plant

What is BOD & COD ?

COD or Chemical Oxygen Demand is the total measurement of all chemicals (organics & in-organics) in the water / waste water; BOD is a measure of, the amount of oxygen that require for the bacteria to degrade the organic components present in water / waste water.

Which is higher in between BOD & COD ?

COD is higher than BOD.

What is the pH balance in Normal Water?

6.5 to 8.5

What is KLD?


What is Waste Management?

Waste Management is the Collection, Transportation & disposal of waste materials.

What is E-Waste?

E-Waste or electronic waste consists of batteries, Computer parts, Wiires, electrical equipment of any kind , electrical equipment of any kind electrical & electronic toys , remotes, watches, cell phones, bulbs, tube lights and CFLs.

What are Hazardous Waste?

Hazardous Waste include three sub categories- E-Waste, toxic substances such as paints, cleaning agents, solvents, insecticides and their containers, other chemicals & biomedical Waste.

What is the desirable limits of TDS in Drinking Water?


What is the method for testing of COD?

Open Reflux Method.

What is RO Water?

Reverse Osmosis Water

What is Incineration?

Incineration is a waste treatment process that involves the combustion of Organic substances contained in Waste cmaterials .Incineration of waste materials converts the waste into ash, flue gas & heat. In some cases, the heat generated by incineration can be used to generate electric power.

What is CETP?

Common & Combined Effluent Treatment Plants.

Water treatment processes are how many types? & What are those?

3 types & they are Primary treatment, Secondary treatment & Tertiary treatment.

What is the desirable limit of Iron in Normal Water?

0.3 mg/L

What is the difference between mg/L or in PPM?

Both are same.

Which Solution used in pH electrode?


What is UASB?

Upflow Anaerobic Sludge Blanket

In between PM 2.5 & PM 10, Which Particulate matter is more toxic?

PM 2.5

What is the full form of NAAQS?

National Ambient Air Quality Standards

What is the unit of Noise?



1dB= 10 log 10

What is the normal noise level in work place?

85 decibell

What is the unit of intensity of illumination?


In which treatment plant COD is much higher?

Effluent Treatment Plant

Which elements present in hard water?

Calcium & Magnesium

What is Alkalinity?

This is the Capacity of Water to neutralize an acid or a base. So that the pH of the water will not Change.

What is the range of pH Scale?

1 to 14

What is the Moisture Content in Water?


What is rectified Spirit?

70 % Ethyl Alcohol

What is the effect of temperatue on gases?

volume increases & density decreases

What is NTP?

Normal Temperature & Pressure.
Normal Temperature = 25°C & Normal Pressure = 1 atm

Which Chemical is known as "King of Chemical"?

Sulfuric Acid (H2So4)

What is the temperature of main body of refrigerator?


Distilled Water contains Minerals. (True/False)