Archives October 2013

JEE Main(AIEEE)Mathematics Solutions have been prepared keeping in mind the present scenario where students find mathematics as a difficult subject. The Mathematics problems here are explained to you through the videos. It’s the human tendency that whatever a person sees remembers it for a longer time period like every movie a person sees remains in his mind. Similarly StudyAdda have come up with the same thought that whatever videos StudyAdda has uploaded relating to the mathematics problems and their solutions will help the students to clarify their doubts. JEE Main Mathematics video lectures have been prepared by going through the current curriculum of these exams. These videos are very helpful to all the JEE aspirant students who are in 11th and 12th std. StudyAdda are continuously uploading a number of video lectures on various topics in mathematics. The students who want video lectures on some topics could mention them on more...

Shri Jai Prakash Narayan, the sarvodaya leader of India, is known popularly as Loknayak. He was the social reformer with socialistic zeal. He was the man who raised voice against the emergency rule of Mrs. Indira Gandhi and her government. He was an author too. Shri Jai prakash Narayan was born on October 11,1902 in Sitabdiara village of Chhapra district in Bihar. His father was Shri Harsood Lal and mother was Smt. Phool Rani. The auspicious day on which he was born was Vijay Dashmi.  He got his early education in his native village. 1919 he passed Matriculation Examination. After that he joined a college but he could not continue his studies. That was the time  when India was under the British Rule and all the true sons of the motherland were engaged in making efforts to free their country. Jai Prakash Narayan was also a great patriot. He could more...

" Mr Jaiprakash is an extraordinary worker. He has command over Socialism."                               Shri Jaiprakash Narayan was born on October 11, 1902 in Sitabdiara Village of Chhapra district in Bihar. He was the son of Shri Harsood Lal and Smt. Phool Rani. He was born on VijaiDashmi. He started his education in his village. He passed Matriculation Examination in 1919. Then he joined a famous college but he had to stop his studies because he joined the Freedom struggle. In 1922 he went to San-Francis where he did his graduation with his own efforts. Thus he was a self made student. In 1929 he returned to India. He made up his mind to live and die for his country in 1921. He dedicated his life to the struggle for freedom in 1934. In 1934 he became more...

"There are nearly as many types of rope as there are fibrous materials on Earth." Brendan McGuigan, writer One of the oldest artifacts in the world, rope is still extensively used in many environments. It seems unlikely that it will be replaced for many years. Traditionally made from natural fibers such as hemp, jute, or coir, rope is now also made from synthetic materials such as nylon and even steel. Rope is braided fiber, twisted to form a supple, strong medium. Its strength is tensile, so its main use is to link objects, one of which acts as a stable anchor for the others to hang from or pull against. The oldest evidence of man-made rope was found in the caves of Lascaux, southwest France, and date from 17,000 B.C.E. Rope has always been used to tie and carry prey, making it an essential hunting tool. Before machinery made it more...

"Wood was credited with 'opening up two new worlds; the worlds at each end of the spectrum'..." Professor Robin Williams, RMIT University, Australia Traditional photography relies upon the interaction of visible light with film or plates to produce an image. As visible light makes up only a small portion of the electromagnetic spectrum, it follows that images could also be produced by infrared (IR) or ultraviolet (UV) light, which flank the visible in the spectrum. The first intentionally produced infrared images were taken by Professor Robert W. Wood. (1868-1955) and displayed in 1910. Wood used a filter over the camera lens to remove all but the infrared light and a film that was sensitive to IR. The technique was used initially for landscapes, because of its long exposure times. Chlorophyll reflects large guantities of infrared light, making foliage appear bright white, while clear blue sky appears almost black. IR photography more...

"The hours of folly are measured by the clock; but of wisdom, no clock can measure." William Blake, poet Clocks usually have two jobs. One is to display the right time; the other is to give a measurement of a time interval. Digital clocks are numeric. Hours, minutes, and seconds are represented by numbers and the display can be made small and linear. Although German inventor Josef Pallweber patented a digital watch as early as 1883, the development of the digital clock proper is closely associated with the history of digital displays. The earliest examples of these were the glowing end of valve tubes that could indicate numbers. These were much loved by the nuclear physics instrumentation industry in the 1950s. The modern digital clock relied significantly on the development of the light emitting diode (LED) and liquid crystal display (LCD). The first commercially usable LEDs were developed in the more...

When John Deere (1804-1886) developed and manufactured the first commercially successful steel plow in 1837, he greatly enhanced agricultural methods in regions encumbered by heavy soils. Since the earliest recorded usage of an effective plow in 5500 B.C.E. by the Sumerians and Babylonians, the moldboard and cast-iron plow were the most notable innovations in design, but neither could effectively counteract the problems of sticky soil. It was the threat of bankruptcy in his native Vermont that persuaded Deere to seek his fortune out west, journeying to Grand Detour, Illinois, where he opened a blacksmith's shop. He soon learned through the frequent repairs he had to undertake that the cast- iron plow that performed so well in the light, sandy New England soil was not suited to the heavy, sticky soils of the Midwest. Farmers complained that the-soil had to be continually removed from the bottom of the plow by hand, more...

India is a land of villages. More than seventy five percent of the population lives in villages. The main occupation in villages is agriculture. Entire family works in the fields in the agricultural work of ploughing, sowing, watering and reaping. Ours is a family of farmers. Ours is a family of five members. Our house is in the one corner of our field. My father is fond of keeping a cow at home. Last year he bought a pair of bullocks and pure white cow with a small calf from a village animal fair. In the morning and evening he prepares fodder to feed them. He cleans the shed daily in the morning. Then he goes in the shed again with a bucket. He washes the teats with water and milks the cow gently and leaves some milk for her little calf. He takes his bath then and within half more...

The buckle originated in circa 700 B.C.E. Many examples survive from ancient Greece and Rome, and indeed from all over Europe into the Middle Ages. The word buckle corner from the Latin word bucca meaning "cheek." Due to its ease of use and manufacture, the buckle continues as a solution to the many fastening problems posed by clothing and equipment. Early buckles were manufactured from bone, ivory, and metal and were used on military gear, harnesses, and armor, being favored mainly because of their durability. The use of the buckle was not restricted to these areas though; they were commonly used as fasteners on boots and shoes and, prior to the invention of the zip, on clothing. The addition of decorative ornamentation lifted the buckle out of its utilitarian realm. Buckles made of silver and bronze and inlaid with precious stones have been found in graves and tombs such as more...

"Carbon paper was initially manufactured entirely by hand and on a craft basis." Bruce Arnold, writer In 1806 the potter and inventor Ralph Wedgwood (1766-1837) was issued a patent for what he called his "stylographic manifold writer," a device that assisted the blind to write by employing a metal stylus rather than simply drawing by hand with the dominant writing implement of the day, a quill pen. His writing machine was a board crisscrossed with metal wires that helped guide the hand of the blind as they wrote. Wedgwood then took a sheet of paper, saturated it in printer's ink, dried it, and placed it between a sheet of tissue paper and a second sheet within the stylographic's writing frame. Its metal stylus was then used to transfer the ink from the carbonized paper to the sheet below, eliminating any concern about keeping quill pens filled with ink. Carbon paper, more...