Description : If Organic sources of carcinogenic compounds in water persist even after chlorination, then what is the correct sequence among treatment processes listed below if all these are considered compulsory ? 1. Coagulation 2. Sedimentation 3. Filtration in ... c) 4- 2- 3- 1- 5 and 6 d) 1-5-2-3-4 and 6
Last Answer : d) 1-5-2-3-4 and 6
Description : Iron & manganese present in the polluted water is removed by (A) Simple filtration (B) Oxidation followed by settling & filtration (C) Chemical coagulation (D) Chlorination only
Last Answer : (B) Oxidation followed by settling & filtration
Description : 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 (A) Chlorination (B) Treating in biological oxygen pond (C) Chemical coagulation (D) None of these
Last Answer : (B) Treating in biological oxygen pond
Description : Very fine suspended and colloidal impurities are removed from water by a process called (A) Sedimentation (B) Coagulation (C) Disinfection (D) Softening
Last Answer : (B) Coagulation
Description : During sewage treatment, effluent from which one of the following treatment units has minimum wt/vol amount of suspended solids? (a) Detritus channel (b) Primary sedimentation tank (c) Secondary sedimentation tank (d) Activated sludge process aeration tank
Last Answer : (d) Activated sludge process aeration tank
Description : During treatment of water, sedimentation is done (A) Before filtration (B) After filtration (C) Simultaneously with filtration (D) Along with chlorination
Last Answer : (A) Before filtration
Description : Chlorination of water does not remove (A) Ammonia content (B) B.O.D. (C) Organic matter content (D) Dissolved oxygen
Last Answer : (D) Dissolved oxygen
Description : Rapid sand filter (A) Should be preceded by coagulation and sedimentation (B) Uses rapid sand as filter media (C) Is used after slow sand filtering has been done (D) Can combine disinfection also
Last Answer : (A) Should be preceded by coagulation and sedimentation
Description : Which is the most practical and economical method for removal of suspended solid matter from polluted water? (A) Sedimentation (B) Skimming off (C) Chlorination (D) Biological oxidation
Last Answer : (A) Sedimentation
Description : The domestic sewage in large cities (a) has a high BOD as it contains both aerobic and anaerobic bacteria (b) is processed by aerobic and then anaerobic bacteria in the secondary treatment in ... sewage contains adequate oxygen (d) has very high amount of suspended solids and dissolved salts.
Last Answer : (b) is processed by aerobic and then anaerobic bacteria in the secondary treatment in Sewage Treatment Plants (STPs)
Description : Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by (A) Natural aeration of water stream (B) Photosynthetic action of algae (C) Both (A) & (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) & (B)
Description : Removal of __________ is accomplished by aeration of water. (A) Dissolved gases (B) Suspended solids (C) Dissolved solids (D) None of these
Last Answer : (A) Dissolved gases
Description : The most commonly used chemical for de-chlorination of water, is (A) Sodium thiosulphate (B) Sodium bisulphate (C) Sodium sulphite (D) Sulphur-dioxide
Last Answer : (C) Sodium sulphite
Description : Separation of solid suspended in liquid into a supernatant clear liquid and a denser slurry employs a process termed as the (A) Coagulation (B) Flocculation (C) Sedimentation (D) Clarification
Last Answer : (C) Sedimentation
Description : In water treatment, alum [Al2 (SO4 )3 ] is used for the process of (A) Filtration (B) Coagulation (C) Sedimentation (D) Disinfection
Description : Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal (A) By chemical coagulation (B) In sedimentation tanks equipped with mechanical scrapper (C) In vacuum filter (D) In clarifiers
Last Answer : (B) In sedimentation tanks equipped with mechanical scrapper
Description : Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted waterstream? (A) Sedimentation tank (B) Circular clarifier (C) Mechanical flocculation (D) Chemical coagulation
Last Answer : (D) Chemical coagulation
Description : __________ is the process of killing organism in water. (A) Coagulation (B) Sterilisation (C) Disinfection (D) Sedimentation
Last Answer : (C) Disinfection
Description : Drinking (potable) water treatment does not involve (A) Coagulation (B) Sedimentation (C) Softening (D) Disinfection
Last Answer : (C) Softening
Description : Pick out the true statement pertaining to water treatment. (A) Slow sand filters can remove colour completely (B) Activated carbon can be used for taste & odour control without subsequent filtration ... of water (D) Normally, the turbidity is removed by adding a coagulant prior to sedimentation
Last Answer : (D) Normally, the turbidity is removed by adding a coagulant prior to sedimentation
Description : The best process of disinfection of public water supply, is by (A) Boiling (B) Chlorination (C) Adding lime (D) Adding ozone
Last Answer : (B) Chlorination
Description : In plain sedimentation tanks under normal conditions, impurities are removed upto (A) 60 % (B) 70 % (C) 80 % (D) 90 %
Last Answer : (B) 70 %
Description : In the activated sludge process A. Aeration is continued till stability B. Aeration is done with an admixture of previously aerated sludge C. Sludge is activated by constant stirring D. Water is removed by centrifugal action
Last Answer : ANS: B
Description : Iron & manganese present as pollutant in water cannot be removed by (A) Ion exchange process (B) Oxidation followed by settling & filtration (C) Lime soda process or manganese zeolite process (D) Chlorination
Last Answer : (D) Chlorination
Description : Iron and manganese present as pollutants in water cannot be removed by_____ (1) oxidation followed by settling and filtration (2) chlorination (3) ion exchange process (4) lime soda process or manganese zeolite process
Last Answer : chlorination
Description : The gas dissolved in water that makes it basic is – (1) ammo (2) sulphur dioxide (3) hydrogen (4) carbon dioxide
Last Answer : (2) sulphur dioxide Explanation: Ammonia has that dissolves in water forms a solution of ammonium hydroxide (NH4OH). This solution (including the gas) is a strong base and will make the solution alkaline.
Description : With regard to the transport of carbon dioxide in blood: a. 25% of carbon dioxide is dissolved in blood b. carbonic anhydrase is found in plasma c. 50% of carbon dioxide is carried as bicarbonate d. deoxygenated haemoglobin facilitates the transport of carbon dioxide
Last Answer : deoxygenated haemoglobin facilitates the transport of carbon dioxide
Description : The carbon dioxide is transported via blood to lungs mostly (a) in combination with haemoglobin only (b) dissolved in blood plasma (c) in the form of bicarbonate ions (d) as carbamino-haemoglobin and as carbonic acid.
Last Answer : (c) in the form of bicarbonate ions
Description : The majority of carbon dioxide produced by our body cells is transported to the lungs as (a) attached to haemoglobin (b) dissolved in the blood (c) as bicarbonates (d) as carbonates.
Last Answer : (c) as bicarbonates
Description : Approximately seventy percent of carbon dioxide absorbed by the blood will be transported to the lungs (a) as bicarbonate ions (b) in the form of dissolved gas molecules (c) by binding to RBC (d) as carbamino - haemoglobin.
Last Answer : (a) as bicarbonate ions
Description : Which of the following is not a feature of potable water? a) It must be clean, colourless and odourless. b) It must be free from bacteria c) It must have excessive sodium ,calcium and magnesium d) It must contain dissolved oxygen and carbon dioxide
Last Answer : c) It must have excessive sodium ,calcium and magnesium
Description : Carbon monoxide is a poisonous gas for one of the following reasons. w) it is a powerful acid anhydride x) it combines with the hemoglobin of the blood y) it depletes the dissolved oxygen in the blood by forming carbon dioxide z) it is a strong oxidizing agent
Last Answer : ANSWER: X -- IT COMBINES WITH THE HEMOGLOBIN OF THE BLOOD
Description : When CO2 (carbon dioxide) is dissolved in water, i yields a solution that: a) has acidic properties b) has basic properties c) is neutral
Last Answer : ANSWER: A -- HAS ACIDIC PROPERTIES
Description : The gas dissolved in water that makes it basic is : (1) ammonia (2) sulphur dioxide (3) hydrogen (4) carbon dioxide
Last Answer : ammonia
Description : The process by which fine solids is removed from liquids is termed as (A) Decantation (B) Flocculation (C) Sedimentation (D) Classification
Description : Radioactive substances present in the polluted water stream can be removed by (A) Biological oxygen treatment (B) Coagulation and filtration (C) Adsorption in ion exchange materials (D) None of these
Last Answer : (C) Adsorption in ion exchange materials
Description : Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by (A) Chemical coagulation (B) Floatation & skimming (C) Centrifugation (D) Ultra filtration
Last Answer : (A) Chemical coagulation
Description : Soluble silica present in boiler feed water can be removed by (A) Coagulation (B) Filtration (C) Anion exchanger (D) Preheating it
Last Answer : (C) Anion exchanger
Description : The main process to purify water by filtration, is (A) Mechanical straining (B) Flocculation and sedimentation (C) Biological metabolism (D) All the above
Last Answer : (D) All the above
Description : Mixing vessel used for the chlorination of methane to produce methyl chloride is made of (A) Copper (B) Cast iron (C) Aluminium (D) High carbon steel
Last Answer : (B) Cast iron
Description : Upon the entry of carbon dioxide in the red blood cells, H+ionsare formed at a very rapid rate, and yet the blood does not turn acid because (a) H+ ions are rapidly exchanged at the ... haemoglobin and plasma (d) H+ ions are buffered by proteins of haemoglobin and proteins and phosphates of plasma
Last Answer : Ans:(c)
Description : How is carbon dioxide removed from blood before it is exhaled?
Last Answer : In humans, carbon dioxide is generated in the tissues during oxidation of glucose, in order to liberate energy, which is resumed to perform body functions. Before exhalation through lungs the gas is transported ... than the tissue capillaries. Nearly 23 per cent of CO{-2} is transported this way.
Description : Aeration of water is done to remove (A) Odour (B) Colour (C) Bacterias (D) Turbidity
Last Answer : (A) Odour
Description : Pick up the correct statement from the following: (A) The zone below water table, is called zone of saturation (B) The zone above water table, is called zone of aeration (C) The water which exists in the zone of saturation, is called ground water (D) All the above
Last Answer : Answer: Option D
Description : The Manufacturer of aeration devices reports the oxygen transfer rate of the device obtained through laboratory tests carried under standard conditions. Such standard condition are : (a) Wastewater at zero DO, 25°C and 760 mm ... DO, 20°C and 760 mm Hg (d) Wastewater at zero DO, 0°C and 700 mm Hg
Last Answer : (c) Tapwater at zero DO, 20°C and 760 mm Hg
Description : Consider the following zones : 1. Saturation zone 2. Capillary zone 3. Intermediate zone 4. Soilwater zone Which of these does not relate to the zone of aeration in the soil profile ? a) 1 and 2 b) 2 and 3 c) 4 only d) 1 only
Last Answer : d) 1 only
Description : Standard process of chlorination of water, is done by (A) Plain chlorination (B) Pre-chlorination (C) Post-chlorination (D) Double chlorination
Last Answer : (C) Post-chlorination
Description : Raw water treated with only chlorine, is known as (A) Plain chlorination (B) Pre-chlorination (C) First-chlorination (D) De-chlorination
Last Answer : (A) Plain chlorination
Description : De-chlorination is followed by (A) Post-chlorination (B) Pre-chlorination (C) Double-chlorination (D) Super-chlorination
Last Answer : (D) Super-chlorination
Description : At break point of chlorination, (A) Chlorine is used to oxidise (B) Residual chloride is zero (C) Residual chloride is maximum (D) Residual chlorine reappears
Last Answer : (D) Residual chlorine reappears