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The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known

The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known Correct Answer Dissolved Oxygen (D.O.)

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The amount of Oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known as
Which of the following statements is correct regarding the oxidation number of Oxygen? I. The oxidation number of Oxygen in most compounds is -2. II. When Oxygen is bonded to Fluorine in compounds like Oxygen difluoride and Dioxygen diflouride, the Oxygen is assigned an oxidation number of +2 and +2 respectively. III. In peroxide, an Oxygen atom is assigned an oxidation number of -1 and in Superoxide, each oxygen atom is assigned an oxidation number of -1/2.
The electricity bill of a certain establishment is partly fixed and partly varies with the number of units of electricity consumed. In a certain month when 540 units are consumed, the bill is Rs. 1,800. In another month the consumed units are 620 and the bill is Rs. 2,040. If 500 units of electricity is consumed in a month, the bill for that month is
Consider the following statements: 1. Ammonia nitrogen is a measure of nitrogen present as ammonium hydroxide and ammonium salts. It will progressively decrease as sewage gets treated. 2. Organic nitrogen is the total nitrogenous matter in sewages excepting that present as ammonia nitrogen, nitrites and nitrates. It becomes ammonia in anaerobic decomposition and nitrites or nitrates in aerobic decomposition. Which of the above statements is/are correct?
The pie chart given below shows the amount spent by a boy on the purchase of six different items. The total amount spent on all these six items is Rs. 54000. The amount spent on a specific item is represented as a degree with reference to the total amount spent on all these six items. Which of the following statement(s) is/are correct? I. The amount spent on article A is Rs.900 less than the amount spent on article B. II. The amount spent on article C is Rs 2400 more than the amount spent on article D. III. The ratio of the amount spent on article B to the amount spent on article E is 4 : 1.
Aerobic bacterias
A measure of the amount of oxygen consumed in the biological process that break down organic matter is known as
In a well aerated and agitated microbial culture, the 'supply' of oxygen is equal to 'demand' (uptake) of the growing culture. The KLa for such a system will be (KLa = volumetric mass transfer coefficient, C* = dissolved oxygen concentration in liquid in equilibrium with gaseous oxygen, C = instantaneous value of dissolved oxygen concentration, 'r' = specific oxygen uptake rate per unit weight of cells, X = dry weight of the cells per unit volume)
The electricity bill of a certain establishment is partially fixed and partially varies as the number of units of electricity consumed. Wen in a certain month 540 units are sonsumed. the bill is TK 1800. In another month 620 units are consumed are the bill is Tk 2040. Inayet another month if 500 units are consumed what would be the bill (in Tk) for that month?
The following table shows the number of families and the total quantity of rice (in kilograms) consumed by them in the six villages of a district in the years 2016 and 2017. Study the table and answer the following question.   Village 2016 2017 Number of families in the Village Rice Consumed  (in kg) Number of families in the Village Rice Consumed  (in kg) A 480 5040 490 5200 B 630 6100 640 6150 C 950 7900 900 8100 D 540 4325 520 4300 E 750 6600 760 6800 F 150 1200 140 1150 In how many villages, the per family consumption of rice has decreased in 2017 as compared to the immediately preceding year?