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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.
Biochemical oxygen demand or BOD is a test of the amount of oxygen needed for bacteria to break down the organic matter in a water sample over a period of
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
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.
What is the amount of oxygen required by bacteria to break down organic matter present in certain volume of sample of water is called?
By studying all following options, select a pair that uses most closely similar reasoning. a. Researchers have looked at the communication between different animals and found that meerkats have a series of alerts and calls that fail into two categories, greetings and alarms. Since we can be sure that this meerkat is not calling as a greeting, we must accept that he is attempting to raise the alarm. b. Farmers must choose between using organic or non-organic fertilisers on their land. Organic fertilisers can produce a lower crop yield and farmers may find it difficult to change to organic methods if they have been using non-organic methods for some time. Farmers should, therefore, consider the longer-term impacts of their decisions. c. Either young persons are getting cleverer each year or examinations are becoming easier for students to pass. Since there is very little evidence from IQ testing and other supposed benchmarks that young persons are more intelligent now than in the past, we must conclude that the examination system is easier for students today than it was in the past. d. Closed wood burning chulhas are a better way to cook your food than open fire chulhas. Closed wood burning chulhas are highly efficient, whereas the open fire of open fire chulhas loses a great deal of heat in the air. More people should, therefore, use closed wood burning chulhas in their homes.
Which of the following statements is/are incorrect? 1. BOD (biochemical oxygen demand) of the effluent refers to the amount of carbon dioxide that would be consumed if all the organic matter in one litre of water were oxidised by bacteria.  2. The greater the BOD of wastewater, the more is its polluting potential. Select the correct answer using the code given below.
Which of the following chemical parameters are associated with the organic content of water? 1. Biochemical Oxygen Demand (BOD) 2. Chemical Oxygen Demand (COD) 3. Total Organic Carbon (TOC) and Total Oxygen Demand (TOD)
Dhanu, Fani, Ganu and Tinu were playing cricket. One of them threw the ball on window by mistake and glass was broken. They all know who has done this and each one makes a statement about this. Select the person who has done the mistake if only one of them is making true statement. Dhanu : I didn't make the mistake and Ganu also didn't break it. Fani : I didn't make the mistake and Dhanu also didn't break it. Ganu : I didn't make the mistake and Fani also didn't break it. Tinu : I didn't make the mistake and Dhanu also didn't break it.
In the following question, the 1st and the last part of the sentence/passage are numbered 1 and 6. The rest of the sentence/ passage is split into four parts and named P, Q, R and S. These four parts are not given in their proper order. Read the sentence/ passage and find out which of the four combinations is correct. 1. A gentleman was walking through an elephant camp. P. He spotted that the elephants weren’t being kept in cages or held by the use of chains.  Q. As the man gazed upon the elephants, he was completely confused as to why the elephants didn’t just use their strength to break the rope and escape the camp. R. Curious and wanting to know the answer, he asked a trainer nearby why the elephants were just standing there and never tried to escape. S. All that was holding them back from escaping the camp, was a small piece of rope tied to one of their legs. 6. The trainer replied, "When they are young and smaller, they are tied in these ropes which they are unable to break. By the time they grow bigger and strong enough to break the rope, they are already conditioned to believe that they can't break the ropes."