Description : For plain chlorination of water, the quantity of chlorine used, is (A) 0.1 mg/litre (B) 0.2 mg/litre (C) 0.3 mg/litre (D) 0.5 mg/litre
Last Answer : (D) 0.5 mg/litre
Description : Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre)? (A) Lagooning (B) Activated carbon adsorption (C) Biological oxidation pond (D) Chemical coagulation
Last Answer : (B) Activated carbon adsorption
Description : In slow sand filters, the turbidity of raw water can be removed only up to (A) 60 mg/litre (B) 75 mg/litre (C) 100 gm/litre (D) 150 mg/litre
Last Answer : (A) 60 mg/litre
Description : One degree of hardness of water means a content of salts of (A) 10.25 mg/litre (B) 12.25 mg/litre (C) 14.25 mg/litre (D) 16.25 mg/litre
Last Answer : (C) 14.25 mg/litre
Description : An identified source of irrigation water has ion concentrations of Na+ , Ca++ and Mg++ as 20, 10 and 8 milliequivalents per litre, respectively. The SAR of this water is approximately : a) 2.06 b) 6.67 c) 2.67 d) zero
Last Answer : b) 6.67
Description : The maximum permissible hardness for public supplies is (A) 95 mg/litre (B) 105 mg/litre (C) 115 mg/litre (D) 125 mg/litre
Last Answer : (C) 115 mg/litre
Description : Pick out the wrong statement. (A) Biological oxygen demand (BOD) is a characteristic and not a constituent of water (B) BOD is a measure of the amount of oxygen which will be demanded & used in 5 days ... BOD is expressed in mg/litre (typically, BOD=2.5 mg/litre for potable water) (D) None of these
Last Answer : (D) None of these
Description : Maximum permissible residual chlorine in treated water should be __________ mg/litre. (A) 0.001 to 0.01 (B) 0.2 to 0.3 (C) 2 to 3 (D) 5 to 10
Last Answer : (B) 0.2 to 0.3
Description : The water fluoridation is 0.5ppm; what is the recommended supplemental fluoride concentrations for 3 years-old child: A. 0.25mg B. 0.50mg C. 1.00mg D. 0 mg
Last Answer : D. 0 mg
Description : The daily fluoride intake should not exceed (A) 0.5 mg (B) 1 mg (C) 2 mg (D) 3 mg
Last Answer : Answer : D
Description : Recommended daily intake of fluoride for a normal adult is (A) 1.5–4.0 mg (B) 0–1 mg (C) 5–10 mg (D) 10–20 mg
Last Answer : Answer : B
Description : Dose of chlorine for disinfection of water is about __________ mg/litre of water. (A) 0.01 (B) 0.1 (C) 0.3 (D) 1
Last Answer : (D) 1
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 : Lagoons used for purification of polluted water (A) Are large shallow artificial lakes also known as clarification lakes, maturation ponds or oxidation ponds (B) Use micro-organisms/bacteria in presence of dissolved oxygen (C) Gives an ... 1 mg/litre and BOD = 3.8 mg/litre (D) All (A), (B) & (C)
Last Answer : (D) All (A), (B) & (C)
Description : Pick out the correct statement. (A) Chemical oxygen demand (COD) is a measure of chemically oxidisable organic matter present in water (B) COD is determined by oxidising the organic matter present in water with potassium dichromate ... of potable water may be 1-2 mg/litre (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is A. 50 mg/l B. 100 mg/l C. 150 mg/l D. 250 mg/l
Last Answer : ANS: D
Description : BOD of raw municipal sewage may be in the range of about __________ mg/litre. (A) 1-2 (B) 5-10 (C) 150-300 (D) 2000-3000
Last Answer : (C) 150-300
Description : COD of raw municipal sewage may be in the range of about __________ mg/litre. (A) 1-2 (B) 5-10 (C) 90-120 (D) 1500-2500
Last Answer : (C) 90-120
Description : How many mg of fluoride ions are obtained from 2.2 mg tablet of NaF A. 0.5mg B. 1 mg C. 1.5mg D. 10mg
Last Answer : B. 1 mg
Description : The optimum dissolved oxygen level (in mg/litre) required for survival of aquatic organisms is - (1) 4 - 6 (2) 2 - 4 (3) 8 - 10 (4) 12 - 16
Last Answer : (1) 4 - 6 Explanation: Oxygen is one of several dissolved gases important to aquatic systems. Dissolved oxygen is necessary to maintain aerobic conditions in surface waters and is ... approach saturation - that concentration which is in equilibrium with the partial pressure of atmospheric oxygen.
Description : In sewage, the solids in mg per litre is A. 100 to 500 B. 500 to 1000 C. 1000 to 1500 D. 1500 to 2000
Last Answer : ANS: B
Description : The optimum dissolved oxygen level (in mg/litre) required for survival of aquatic organisms is : (1) 4 – 6 (2) 2 – 4 (3) 8 – 10 (4) 12 – 16
Last Answer : 4 – 6
Description : Fluoride in water community of 4ppm will result in: A. No mottling B. Mottling in almost all permanent teeth except some molars C. Mottling in permanent premolars only
Last Answer : B. Mottling in almost all permanent teeth except some molars
Description : Fluoride pollution mainly affects (a) brain (b) heart (c) teeth (d) kidney.
Last Answer : (c) teeth
Description : Recession of gingiva of several anterior teeth caused by exposure and softened cementum; what would you do? A. Scrap the soften cementum and apply fluoride B. Scrap the soften cementum and use GIC C. Class V amalgam
Last Answer : B. Scrap the soften cementum and use GIC
Description : Of all the factors that increase the resistance of teeth to dental caries, THE MOST EFFECTIVE is,** A. The general nutrition of a child during the period of tooth formation B. The ... eruption D. Sufficient intake of calcium and Vitamin D during the period of enamel mineralization and maturation
Last Answer : B. The intake of fluoride during the period of enamel mineralization and maturation
Description : Pick up the incorrect statement from the following regarding fire hydrants (A) Fire hydrants are fitted in water mains at 100 m to 150 m apart at fire (B) The minimum water pressure hydrants, is kept 1.5 kg/ ... to 1.5 kg/cm2 is made available for 4 to 5 hours for constant use (D) None of these
Description : The difference in the reservoir level and the lowest point of the water mains is 180 m. The expected pressure due to water hammer is 7.5 kg/cm2 in a pressure conduit of diameter 1 m. Assuming the efficiency of the ... , is (A) 10 mm (B) 15 mm (C) 20 mm (D) 25 mm
Last Answer : (C) 20 mm
Description : Air inlet valve in water mains, is generally provided at (A) Summit of the pipe (B) Upstream of sluice valve (C) Downstream of sluice valve (D) Both (a) and (c) of above
Last Answer : (D) Both (a) and (c) of above
Description : The factor affecting per capita demand, is (A) Size of the city (B) Climatic conditions (C) Pressure in water mains (D) All the above
Last Answer : (D) All the above
Description : The approximate diameter of a water mains for supplying 7.2 mld with a velocity 1.2 m/sec, is (A) 24 cm (B) 26 cm (C) 28 cm (D) 30 cm
Last Answer : (D) 30 cm
Description : Pressure relief valves are provided in water mains (A) To reduce the pressure (B) At low points (C) Upstream of sluice (D) All the above
Description : Most commonly used pump for lifting water in water supply mains, is (A) Axial flow pump (B) Reciprocating pump (C) Rotary type pump (D) Centrifugal pumps
Last Answer : (A) Axial flow pump
Description : Distribution mains of any water supply, is normally designed for its average daily requirement (A) 100 % . (B) 150 % (C) 200 % (D) 225 %
Last Answer : (D) 225 %
Description : In pressure supply mains, water hammer pressure is reduced by providing (A) Sluice valves (B) Air valves (C) Pressure relief valves (D) None of these
Last Answer : (C) Pressure relief valves
Description : According to National Building Code, the hydrants in water mains is provided at minimum interval of (A) 50 m (B) 60 m (C) 75 m (D) 90 m
Last Answer : Option C
Description : Sluice valves are fitted in a distribution system (A) Along straight length of pipes at suitable intervals (B) At the junctions of the pipes (C) At the branching off points of sub-mains (D) All the above
Description : How To Buy Proper Childrens Shoes?
Last Answer : Buying shoes for children is perhaps one of the biggest expensesfor parents because it often seems that children outgrow theirshoes from one day to the next. It is important for children'sshoes to fit the ... the shoe. There shouldalways be a thumb's width between the end of the longest of thechild'
Description : What can be proper letter spacing for a children's book?
Last Answer : If you mean for a manuscript, typically 12-point font is recommended. If you're talking about for an actual book, that tends to vary depending on the type of children's book (picture book, easy reader, chapter book) and on the length and illustrations.
Description : Did anyone besides me keep their children's "tooth fairy" teeth?
Last Answer : answer:I did, and a good thing, too. I trained my sons to put the newly lost tooth in an envelope addressed to the tooth fairy, so I wouldn't have to feel around under the pillow for a single tooth ... and returned a tooth to my son. Catastrophe averted. If he ever caught on to me, he never let on.
Description : Do Diet Coke/Diet Pepsi/Diet Colas really rot children's teeth?
Last Answer : Diet sodas have artificial sweeteners, right? Those things are terrible for you. I avoid them at all cost, and wouldn't give them to my children. We drink natural soda, and when my children are old enough ... they can drink it as well. I think it's a moderation thing. Too much can hurt the teeth.
Description : How do you service a cooling tower? • Ensure Proper Airflow. . Clean Your Tubes. • Inspect the Water Pump. • All of above
Last Answer : all of above
Description : How do you service a cooling tower? • Ensure Proper Airflow. Clean Your Tubes. • Inspect the Water Pump. • All of above
Last Answer : All of above
Description : What is the reason to service a cooling tower? a) to ensure proper air flow b) to clean the tubes c) to inspect the water pump d) all of these
Last Answer : all of these
Description : How should I measure my child to ensure I buy the proper size costume?
Last Answer : Measure their waist and height. The packaging in-store should tell you if it will fit your child.
Description : Assistant Superintendents attached to the Mail offices to be perform a) To exercise overall supervision over the work done in the mail office. He will be responsible for proper maintenance of discipline, and ... Officers of the Civil Aviation, IAC, Police, Custom, Railways etc d) All the above;
Last Answer : d) All the above;
Description : Quality fiber-end preparation is essential for proper system operation. What properties must an optical fiber-end face have to ensure proper fiber connection?
Last Answer : Be flat, smooth, and perpendicular to the fiber axis.
Description : If tomatoes are picked green or before they are fully mature, how should they be handled to ensure proper ripening and full flavor?
Last Answer : A. Never refrigerate tomatoes if immature when picked. Place them in a single layer at room temperature, and allow them to develop full color. When fully ripe, place them in the refrigerator where they can be stored for several weeks.
Description : Slow sand filter is used if maximum turbidity of raw water is less than (A) 10 gm/litre (B) 20 gm/litre (C) 30 gm/litre (D) 50 gm/litre
Last Answer : (D) 50 gm/litre
Description : Rapid gravity filter can only remove turbidity of water upto (A) 15 to 25 gm/litre (B) 25 to 30 gm/litre (C) 30 to 35 cm/litre (D) 35 to 40 gm/litre
Last Answer : (D) 35 to 40 gm/litre