Ragpre Education

 

‘The last year was all work, no play for Punjab boy Achin Bansal and Mumbai girl Ankita Sharma.. Their lives revolved around books, coaching classes and cramming till all hours of the night. Today, their hard work has paid off and how. The IIT-Joint Entrance Exams (IIT-JEE) results are out and Achin has emerged the topper among boys and Ankita among girls.

Achin, who hails from a small town called Kot Kapura in Punjab, is the son of a medical practioner. He told the Press Trust of India over telephone that he intended to do a computer science course from IIT-Bombay.

“The feeling has yet to sink in,” said Ankita. “I didn't expect a rank. So I am very excited.” The 17-year-old, who dropped an academic year and headed for coaching classes in Rajasthan to prepare for the exam, is also headed for IIT-Bombay. But she is yet to decide between computer science and electrical engineering.

With three IITians in the family, the Sharmas are more than happy with another addition.

It has also been a very good year for the Delhi zone — which includes Punjab, Himachal Pradesh, Jammu and Kashmir and the National Capital Region. Approximately 46,000 candidates appeared for the IIT-JEE from this zone; 1,398 of them made it.
Right behind Achin on the rank list is Nitish Shrivastava, a student of Delhi Public School, R.K. Puram. “It was his sincerity and hard work that worked. He never took any additional coaching,” said his principal Dr Shyama Chona.

Professor Chattopadhyay, chairman, IIT-JEE, Delhi, attributed the good showing to the changed exam pattern, whereby students were required to sit for two papers, which had only objective type questions. “The idea was to de-stress students by improving exam timings, so that students coming from far off places were not placed under added time constraints.”

Indians - Believe in Yourself

As India continues to rise, the belief in Indians that they are nothing less is important. The dominance of the western world, western names in science and other fields may make a non-westerner start doubting his/her own abilities.

Any student of science/maths gets to hear about more and more western names given the credit for inventions/discoveries. Many voices have been raised by different people in India to claim otherwise on several fronts. But, these voices have not risen to enhance each other collectively but have been raised singularly.

Students of science/maths at 10+ level know about the importance of calculus. One can not imagine about learning Physics without being exposed to calculus. When one learns chapter on gravitation, one can occasionally read that calculus was invented by Newton and Leibniz. One can find the mention of the same names while learning calculus. The following is mentioned in page 319, new NCERT maths eBook for class.

Here is a good news to cherish and to make us believe in our abilities:

Calculus Created in India 250 Years Before Newton: Study

The progress of a civilization largely depends on the dreams of the people. Dreams are influenced by role models. It is important that the hidden real heroes are brought into the limelight. I hope that revelations like this invoke self-belief, inspire dreams leading towards achievement and contribution.

Determination Of Alcohol Content In Blood
Because blood passes through the arteries in the lungs, an equilibrium is established between the alcohol in one's blood and the alcohol in one's breath. So if the concentration of one is known, the concentration of the other can be estimated.

The test that law enforcement agencies use to approximate a person's blood alcohol level is based on the oxidation of breath ethanol by sodium dichromate. A sealed glass tube is used, which contains the oxidising agent impregnated onto an inert material. The ends of the tube are broken off. One end of the tube is attached to a mouthpiece and the other to a balloon-type bag. The person undergoing the test blows into the mouthpiece until the bag is filled with air.

Ethanol in the breath is oxidized as it passes through the column. When ethanol is oxidized, the red-orange oxidizing agent (Cr2O72-) is reduced to green chromic ion. The greater the concentration of alcohol in the breath, the farther the green colour spreads through the tube.

C2H5OH + Cr2O72– ——–> Cr+3 + CH3COOH
red-orange green

If the person fails this test — determined by the extent to which the green colour spreads through the tube — a more accurate Breathalyser test is administered. This test also depends on the oxidation of breath ethanol by sodium dichromate, but it provides more accurate results. Here, an accurate volume of breath is bubbled through an acidic solution of sodium dichromate. The concentration of chromic ion is measured precisely using a spectrophotometer.

 

 

 

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