Q. Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO₂ in air is __________ ppm.

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Q. Main pollutants released from iron & steel industry is

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Q. Exposure to chemicals having carcinogenic properties cause

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Q. The commonest form of iron & manganese found in ground water as pollutant is in the form of their

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Q. 80% less than 200 mesh size particles are called

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Q. Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal

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Q. Inhalation of lead compounds present in the automobile exhausts (using leaded petrol) causes

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Q. TLV of ozone (O₃) and phosgene (COCl₂) in air is __________ ppm.

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Q. Most of the atmospheric air pollutants are present in large quantity in

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Q. Pick out the wrong statement.

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Q. 'Pneumoconiosis' is a disease caused by the inhalation of __________ dust.

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Q. The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the

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Q. Pick out the wrong statement.

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Q. The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by

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Q. Phenolic water generated in coke ovens & by-product plant attached to an integrated steel plant containing phenol in concentration of less than 100 mg/litre can be removed by

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Q. Which of the following dust collection equipments is the least efficient (for sub-micronic particles) ?

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Q. Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is

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Q. Dust collection efficiency of a cyclone separator depends upon its

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Q. Which of the following is the most detrimental for water used in high pressure boiler ?

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Q. Turbidity of water is an indication of the presence of

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