Description : 72. Measuring Biochemical Oxygen Demand (BOD) is a method used for (1) Working out the efficiency of R.B.Cs. about their capacity to carry oxygen (2) Estimating the amount of ... driven automobile engines (4) Measuring the activity of Sacccharomyces cerevisae in producing curd on a commercial scale
Last Answer : Estimating the amount of organic matter is sewage water
Description : Measuring Biochemical Oxygen Demand (BOD) is a method used for (a) estimating the amount of organic matter in sewage water (b) working out the efficiency of oil driven automobile engines ... commercial scale (d) working out the efficiency of RBCs about their capacity to carry oxygen.
Last Answer : (a) estimating the amount of organic matter in sewage water
Description : Measuring Biochemical Oxygen Demand (BOD) is a method used for (a) estimating the amount of organic matter in sewage water (b) working out the efficiency of oil driven automobile engines (c) ... a commercial scale (d) working out the efficiency of RBCs about their capacity to carry oxygen.
Description : (2) amount of oxygen used for biochemical oxidation Explanation: Biochemical oxygen demand or B.O.D. is the amount of dissolved oxygen needed by aerobic biological organisms in a body of water to ... quantitative test, although it is widely used as an indication of the organic quality of water.
Last Answer : The addition of gypsum to port-land cement helps in : (1) increasing the strength of cement (2) rapid setting of cement (3) preventing rapid setting of cement (4) reduction in the cost of cement
Description : High value of BOD (Biochemical Oxygen Demand) indicates that (a) water is less polluted (b) consumption of organic matter in the water is higher by the microbes (c) water is pure (d) water is highly polluted.
Last Answer : (b) consumption of organic matter in the water is
Last Answer : (b) consumption of organic matter in the water is higher by the microbes
Description : BOD stands for : (1) Biological oxidation demand (2) Biological oxygen demand (3) Biochemical oxygen demand (4) Biotic oxidation demand
Last Answer : (3) Biochemical oxygen demand Explanation: BOD stands for Biochemical Oxygen Demand. It is the amount of dissolved oxygen needed by aerobic biological organisms to break down organic material present in a ... in milligrams of oxygen consumed per litre of sample during 5 days of incubation at 20°C.
Last Answer : Biochemical oxygen demand
Description : Biochemical Oxygen Demand (BOD) of sewage is the (a) Oxygen required to oxidise (b) Oxygen required to oxidise biologically inactive organic matter* (c) a and b both (d) none of these
Last Answer : (b) Oxygen required to oxidise biologically inactive organic matter*
Description : Biochemical Oxygen Demand (BOD) may not be a good index for pollution for water bodies receving effluents from:
Last Answer : Biochemical Oxygen Demand (BOD) may not be a good index for pollution for water bodies receving ... sewage C. Dairy industry D. Petroleum industry
Description : Biochemical oxygen demand (BOD) in a river water
Last Answer : Biochemical oxygen demand (BOD) in a river water A. Increases when sewage gets mixed with river ... water D. Gives a measure of Salmonella in water
Description : Biochemical oxygen demand (BOD) in a river water (a) has no relationship with concentration of oxygen in the water (b) gives a measure of Salmonella in the water (c) increases when sewage gets mixed with river water (d) remains unchanged when algal bloom occurs.
Last Answer : (c) increases when sewage gets mixed with river water
Description : Biochemical Oxygen Demand (BOD) may not be a good index for pollution for water bodies receiving effluents from (a) domestic sewage (b) dairy industry (c) petroleum industry (d) sugar industry.
Last Answer : c) petroleum industry
Last Answer : (c) petroleum industry
Description : High value of BOD (Biochemical Oxygen Demand) indicates that:
Last Answer : High value of BOD (Biochemical Oxygen Demand) indicates that: A. Highly polluted water B. Less ... in water C. Less sewage D. Less microorganisms.
Last Answer : High value of BOD (Biochemical Oxygen Demand) indicates that: A. consumption of organic matter in ... is highly polluted D. water is less polluted
Description : Measuring Biochemical Oxygen Demand (BOD) is a method used for:
Last Answer : Measuring Biochemical Oxygen Demand (BOD) is a method used for: A. Measuring the activity of ... out the efficiency of oil driven automobile engines
Description : Biological Oxygen Demand (BOD) is a measure of: a. Industrial wastes poured into water bodies b. Extent to which water is polluted with organic compounds c. Amount of carbon monoxide inseparably combined with haemoglobin d. Amount of oxygen needed by green plants during night
Last Answer : Ans: A
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 : Which of the following processes is involved in the biochemical treatment of sewage effluents? (A) Oxidation (B) Reduction (C) Dehydration (D) Fermentation
Last Answer : (A) Oxidation
Description : The biochemical treatment applied to sewage effluents is a process of (A) Dehydration (B) Reduction (C) Oxidation (D) Polymerisation
Last Answer : (C) Oxidation
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 : The reaction between oxygen and organic material is a/an __________ reaction. (A) Exothermic (B) Endothermic (C) Biochemical (D) Photochemical
Last Answer : (A) Exothermic
Description : Assertion: Amount of biodegradable organic matter present in water is measured by BOD of water Reason: During biodegradation of organic compounds. Oxy
Last Answer : Assertion: Amount of biodegradable organic matter present in water is measured by BOD of water Reason: ... but reason is wrong D. both are wrong
Description : The magnitude of BOD of wastewater is related to A.bacterial count B.amount of organic material C.amount of inorganic material D.all of the above
Last Answer : B.amount of organic material
Description : When caring for a patient receiving autolytic debridement therapy, the nurse a) advises the patient about the foul odor that will occur during therapy. During autolytic debridement ... Pancrease. Commercially available enzymatic debriding agents include Accuzyme, Clooagenase, Granulex, and Zymase.
Last Answer : a) advises the patient about the foul odor that will occur during therapy. During autolytic debridement therapy a foul odor will be produced by the breakdown of cellular debris. This odor does not indicate that the wound is infected.
Description : Of the following man-made disasters, which is socially induced? (1) Debris Avalanche (2) Salt Water Intrusion (3) Arson (4) Ozone depletion
Last Answer : (3) Arson Explanation: Arson is the crime of intentionally and maliciously setting lire to buildings, wild land areas, vehicles or other property with the intent to cause damage. Distinct from ... and natural wildfires, it is considered to be a man-made disaster which is socially induced.
Description : Of the following man-made disasters, which is socially induced ? (1) Debris Avalanche (2) Salt Water Intrusion (3) Arson (4) Ozone depletion
Last Answer : Arson
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 : (1) the action of ultraviolet rays on oxygen Explanation: The majority of tropospheric ozone formation occurs when nitrogen oxides (NOx), carbon monoxide (CO ) and volatile organic compounds (VOCs), such as xylene, ... violet rays. NOx, CO, and VOCs are called ozone precursors. CO + 2O2 + CO2 + O3
Last Answer : Water is not effective in extinguishing a fire caused by petrol because - (1) the flame is too hot for water to cool it down (2) water and petrol react chemically (3) water and petrol are ... (4) water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn
Description : Which of the following causes the rusting of iron? a. Oxidation b. Reduction c. Chemical reaction with oxygen d. Chemical reaction with CO2 (1) a and b (2) b and c (3) c and d (4) a and c
Last Answer : a and c
Description : Pheretima posthuma is highly useful as (a) their burrows make the soil loose (b) they make the soil porous, leave their castings and take organic debris in the soil (c) they are used as fish meal (d) they kill the birds due to biomagnification of chlorinated hydrocarbons.
Last Answer : (b) they make the soil porous, leave their castings and take organic debris in the soil
Description : Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N2) to the atmosphere? (a) Aerobic nitrate oxidation and nitrite reduction (b) ... fixation by Rhizobium in root nodules of legumes (d) Anaerobic ammonium oxidation and denitrification
Last Answer : (d) Anaerobic ammonium oxidation and denitrification
Description : Which reagent does not give oxygen as one of the product during oxidation with ozone?
Last Answer : Which reagent does not give oxygen as one of the product during oxidation with ozone? A. `SO_(2)` B. `SnCl_(2)//HCl` C. `H_(2)S` D. both 1 & 2
Description : Ozone on reaction with one of the following reagents uses all its 3 oxygen atoms for oxidation
Last Answer : Ozone on reaction with one of the following reagents uses all its 3 oxygen atoms for oxidation A. `SO_(2)` B. ` ... of HCl C. `CH_(2)=CH_(2)` D. All
Description : In the context of the chemical process industries, the term BOD is normally associated with the (A) Characterisation of solid wastes (B) Organic concentration in gaseous effluents (C) Characterisation of liquid effluents (D) Characterisation of boiler feed water
Last Answer : (C) Characterisation of liquid effluents
Description : Consider the following statements : Activated sludge process can be said to comprise : 1. Conversion of dissolved organic matter into biological flocs 2. Removal of dissolved BOD of the waste water 3. Digestion of the sludge Which ... 2 and 3 (b) 1 and 2 only (c) 2 and 3 only (d) 1 and 3 only
Last Answer : (b) 1 and 2 only
Description : Enzymes are organic catalysts used in the __________ reactions. (A) Chemical (B) Biochemical (C) Photochemical (D) Electrochemical
Last Answer : (B) Biochemical
Description : Assertion : BOD of river polluted by sewage is more than 20 ppm. Reason: Polluted river contains excess of organic matter.
Last Answer : Assertion : BOD of river polluted by sewage is more than 20 ppm. Reason: Polluted river contains excess ... true but reason is wrong D. Both are wrong
Description : BOD is connected with a) Organic matter b) microbes c) Microbes and Organic matter d) None of the above.
Last Answer : c) Microbes and Organic matter
Description : Disc type furrow openers are especially suited to A. Stoney and root infested soils B. Poorly prepared bed in trashy soil C. Hard and sticky soil with considerable amount of debris and mulch D. All of the above
Last Answer : C. Hard and sticky soil with considerable amount of debris and mulch
Description : Shoe type furrow openers especially suited to A. Stoney and root infested fields B. Poorly prepared bed in trashy soils C. Hard and sricky soil with considerable amount of mulch and debris D. All of the above
Last Answer : B. Poorly prepared bed in trashy soils
Description : Biochemical Oxygen Demand (B.O.D.) of safe drinking water must be (A) Nil (B) 5 (C) 10 (D) 15
Last Answer : (A) Nil
Description : The term Biological Oxygen Demand (BOD) is used in relation to (A) Potable water (B) Cooling water (C) Distilled water (D) Industrial effluents
Last Answer : (D) Industrial effluents
Description : Water pollution can be identified by testing its A. PH level B. Biological Oxygen Demand (BOD) C. Both (a) and (b) D. None of these.
Last Answer : C. Both (a) and (b)
Description : 8. If pollutants are added continuously in a water body they will cause a) increase in BOD b) decrease in BOD c) death of all plants d) increase in oxygen concentration
Last Answer : a) increase in BOD
Description : For individuals known to be dying by virtue of age and/or diagnoses, which of the following signs indicate approaching death: a) Increased restlessness As the oxygen supply to the ... Increased urinary output Based upon decreased intake, urinary output generally decreases in amount and frequency.
Last Answer : a) Increased restlessness As the oxygen supply to the brain decreases, the patient may become restless.