Biochemical Oxygen Demand (B.O.D.) of safe drinking water must be
(A) Nil
(B) 5
(C) 10
(D) 15
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 : B.O.D. of treated water should be (A) 10 ppm (B) 25 ppm (C) 20 ppm (D) Nil
Last Answer : (D) Nil
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 : 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 : 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
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
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.
Last Answer : (b) consumption of organic matter in the water is higher by the microbes
Last Answer : (c) petroleum industry
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 : 5 days-biochemical oxygen demand (BOD5) is taken at a temperature of A. 0°C B. 15°C C. 20°C D. 25°C
Last Answer : ANS: C
Description : Biochemical oxygen demand measures:
Last Answer : Biochemical oxygen demand measures: A. Industrial pollution B. Air pollution C. Dissolved ... for decomposers D. Pollution capacity of effluents
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 : 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.
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*
Last Answer : Biochemical oxygen demand
Description : The permissible amount of nitrites present in potable water, is (A) 10 ppm (B) 15 ppm (C) 45 ppm (D) Nil
Description : Match List-I (Type of Unemployment) with List-II (Characteristics) and select the correct answer using the codes given below: L ist-I L ist -I I (Type of (Char acter ist ics) Unem ... contribution by the additional labour is nil E. Cyclical V. Job opportunities during certain months in the year
Last Answer : (1) A-V, B-III, C-IV, D-II, E-I
Description : Points & Crossing is laid at a cant of a. 1 in 20 b. 1 in 10 c. 1 in 15 d. NIL*
Last Answer : d. NIL*
Description : Consider the statements given below regarding contraception and answer as directed thereafter. (1) Medical termination of pregnancy (MTP) during first trimester is generally safe. (2) Generally chances of conception are nil until mother breast- ... are correct? (a) 1, 3 (b) 1, 2 (c) 2, 3 (d) 3, 4
Last Answer : (a) 1, 3
Description : Volumetric composition of flue gas analysed with the Orsat apparatus is : CO2 = 12%, O2 = 8%, CO = nil, N2 = 80%. This flue gas composition indicates that (A) Pure oxygen has been used for combustion ... very high (C) Excess air has been used for combustion (D) Hydrogen is not present in the fuel
Last Answer : (C) Excess air has been used for combustion
Description : Lead pipes are not safe for carrying drinking water because water containing dissolved oxygen attacks lead thereby forming poisonous Pb (OH)2 . Lead pipes are readily corroded by (A) Dilute HCI (B) Acetic acid (C) Concentrated H2SO4 (D) None of these
Last Answer : (B) Acetic acid
Description : Lead pipes are not safe for carrying drinking water, because water, containing dissolved oxygen attacks lead thereby forming poisonous Pb(OH)2 . Lead pipes are readily corroded by (A) Dilute HCl (B) Acetic acid (C) Concentrated H2SO4 (D) None of these
Description : The BOD values of water indicate the (1) amount of organic debris (2) amount of oxygen used for biochemical oxidation (3) amount of oxygen used for biochemical reduction (4) amount of ozone used for biochemical oxidation
Last Answer : amount of oxygen used for biochemical oxidation
Description : The maximum permissible nitrites in public water supplies, is (A) Nil (B) 0.5 P.P.M. (C) 1.0. P.P.M. (D) 1.5 P.P.M
Last Answer : (A) Ni
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 : Demand for public uses in a city, does not include water required for (A) Watering of public parks (B) Watering of public gardens (C) Sprinkling on roads (D) Drinking purposes
Last Answer : (D) Drinking purposes
Description : The live load to be considered for an inaccessible roof, is (A) Nil (B) 75 kg/m2 (C) 150 kg/cm2 (D) 200 kg/m
Last Answer : Answer: Option B
Description : The live load to be considered for an accessible roof, is (A) Nil (B) 75 kg/m3 (C) 150 kg/m2 (D) 200 kg/cm
Last Answer : Answer: Option C
Description : In scanty rainfall regions, the camber provided will be (A) Nil (B) Flatter (C) Steeper (D) None of these
Description : Pick up the correct statement from the following: (A) The height of head light above road surface, is taken as 0.75 m (B) The beam of head light is up to one degree upwards from the grade of road (C) While designing the valley curve, the height of the object is assumed nil (D) All the above
Last Answer : Answer: Option D
Description : Vibrated concrete needs ________________slump values (a) High (b) Less (c) Nil (d) None of these
Last Answer : (b) Less
Description : .A normal green male maize is crossed with albino female. The progeny is albino because (a) trait for a albinism is dominant (b) the albinos have biochemical to destroy plastids derived from green male (c) plastids are inherited from female parent (d) green plastids of male must have mutated.
Last Answer : (c) plastids are inherited from female paren
Description : Cells must constantly manage metabolic pathways, and this is often done by balancing specific biochemical reactions within a pathway. For example, the metabolic product of one pathway may block the formation ... the pathway to prevent a buildup of that specific product. What is this process called?
Last Answer : Feedback inhibition
Description : To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of A. Hydrochloric acid B. Sulphuric acid C. Nitric acid D. Citric acid
Last Answer : ANS: B
Description : The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known A. Bio-Chemical Oxygen Demand (B.O.D.) B. Dissolved Oxygen (D.O.) C. Chemical Oxygen Demand (C.O.D.) D. None of these
Description : Pick out the wrong statement. (A) Biological oxygen demand (B.O.D.) value of a sewerage sample is always lower than its chemical oxygen demand (C.O.D.) value (B) Environmental pollution by ... in but does not allow the short wavelength infra red radiation to escape out of the earth's atmosphere
Last Answer : (D) The characteristic of a green house body is that it allows the long wavelength incoming solar radiation to come in but does not allow the short wavelength infra red radiation to escape out of the earth's atmosphere
Description : While designing a water supply of an industrial township, industrial and commercial water demand of total supply, is assumed (A) 10 % (B) 10 to 15 % (C) 15 to 20 % (D) 20 to 25 %
Last Answer : (D) 20 to 25 %
Description : According to I.S. : 456 specifications, the safe diagonal tensile stress for M 150 grade concrete, is (A) 5 kg/cm2 (B) 10 kg/cm2 (C) 15 kg/cm2 (D) 20 kg/cm
Last Answer : Answer: Option A
Description : PH is the negative logarithm of the hydrogen Ion Concentration express4ed in moles/liter of aqueous solution. PH of buffer solution is calculated by. Henderson's equation Name the best ... Chemical kinetics deals with study of. Rates and mechanisms of chemical and Biochemical reactions
Last Answer : What does Thermodynamics helps in predicting ?
Description : Which one of the following tests employs ferroin indictor ? (a) Chemical oxygen demand (b) Ammonia nitrogen (c) Nitrate nitrogen (d) Fluoride
Last Answer : (a) Chemical oxygen demand
Description : In testing a pile by load test, pile platform is loaded with one and half times the design load and a maximum settlement is noted. The load is gradually removed and the consequent rebound is measured. For a safe pile, the net ... load should not exceed (A) 10 mm (B) 15 mm (C) 20 mm (D) 25 mm
Description : A 53-year-old man presented with hypertension of 150/110 mmHg. He is generally asymptomatic and has no previous medical history of note. He is a smoker of 5 cigarettes daily and drinks ... Adrenocortical adenoma 2) Bartter's syndrome 3) Liddle's syndrome 4) Liquorice ingestion 5) Pheochromocytoma
Last Answer : Answers-1 This patient is most likely to have Conn's syndrome as reflected by the hypokalaemic hypertension. Liquorice ingestion or Liddle's syndrome are again possible causes of ... hypertension (often diastolic hypertension), muscular weakness, paresthesias, headache, polyuria, and polydipsia."
Description : A colour blind man marries a woman with normal sight who has no history of colour blindness in her family. What is the probability of their grandson being colour blind ? (a) Nil (b) 0.25 (c) 0.5 (d) 1
Last Answer : b) 0.25
Description : Assume CO2 equivalent emissions by the use of a 60 W incandescent lamp are of the order of 60 g/hr. If it is replaced by a 5 W LED lamp then the equivalent CO2 emissions will be a) nil b) 5 g/hr c) 12 g/hr d) 300 g/hr
Last Answer : b) 5 g/hr