AIEEE Questions

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Sewage treatment generally involves three stages, called primary, secondary and tertiary treatment.

Primary treatment consists of temporarily holding the sewage in a quiescent basin where heavy solids can settle to the bottom while oil, grease and lighter solids float to the surface. This removes material that will either float or readily settle out by gravity. It includes the physical processes of screening, comminution, grit removal, and sedimentation.

Secondary treatment removes the soluble organic matter that escapes primary treatment. It also removes more of the suspended solids. Removal is usually accomplished by biological processes in which microbes consume the organic impurities as food, converting them into carbon dioxide, water, and energy for their own growth and reproduction.

Tertiary treatment includes removal of nutrients such as phosphorus and nitrogen and practically all suspended and organic matter from waste water.

Amazon Rainforest Forests are located in South America.

Polar lights (aurora polaris) are a natural phenomenon found in both the northern and southern hemispheres that can be truly awe inspiring.

Northern lights are also called by their scientific name, aurora borealis, and

Southern lights are called aurora australis.

Interest is usually associated with notes receivable.

We know that, elements in the same group of the periodic table have similar characteristics. Here magnesium and strontium are the same 2nd group elements and have same behavior. 

Therefore, strontium behaves same as magnesium. 

Virat Kohli becomes 1st player to win all 3 top ICC Awards :-

1. Sir Garfield Sobers Trophy for ICC Cricketer of the Year,

2. ICC Men’s Test Player of the Year &

3. ICC ODI Player of the Year for 2018.

Proof of Sum of cubes of first n even natural numbers ::

Hence, in other words, the sum of the first n cubes is the square of the sum of the first n natural numbers.