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Paragraph on “Electricity” complete paragraph for Class 9, Class 10, Class 11 and Class 12

Electricity “Life without electricity! impossible.” yes it is true. Today most things are not possible without electricity, for that matter this book could not have been printed without it either. We owe it to Alessandro Volta who, in the year 1800, invented the first battery which made possible the providing of a continuous electrical current. In those days there were various machines which provided electricity in surges but not a continuous...
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Paragraph on “The Postal System” complete paragraph for Class 9, Class 10, Class 11 and Class 12

The Postal System Today we put a letter into as letter box and take it for granted that our letter would reach the person we have addressed it to, it would be worthwhile to understand how the postal system started. The postal system dates back to the times of the Romans and the Persians, but in those days the government took responsibility only of its own official messages. Later in the...
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Paragraph on “Submarines and Ships” complete paragraph for Class 9, Class 10, Class 11 and Class 12

Submarines and Ships The development of ships began with reed boats and rafts more than 6000 years ago. The first boats were used by the Egyptians and they were made of a wicker frame covered with the skins and hides of animals, these were small crafts and could he used by one or two persons. Subsequent to this they invented the sails in the year 3200 B.C. and larger boats made...
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Paragraph on “Transportation” complete paragraph for Class 9, Class 10, Class 11 and Class 12

Transportation In the earlier days man was his own beast of burden, i.e. if you wanted something transported, you had to carry it. As man learned how to tame animals like donkeys, buffaloes, horses etc he shifted his weight on to their backs. Thus the first forms of transportation came into being. These crude means sufficed for many years but then with the need to travel frequently, also developed the need...
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Paragraph on “The Automobile” complete paragraph for Class 9, Class 10, Class 11 and Class 12

The Automobile Unlike other inventions, the credit of inventing the automobile cannot be given to one single person. This necessity of our life was developed with the consolidated efforts of many scientists and engineers over the years. Today a new car is being made almost every second and we take it as a part of our lives, yet in the 1880s people laughed at these contraptions and called them `horseless carriages’...
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Paragraph on “The Petrol Engine” complete paragraph for Class 9, Class 10, Class 11 and Class 12

The Petrol Engine The petrol engine was first developed by a German called Nicholas Otto in 1878. And subsequently Karl Benz and Gottlieb Daimler in 1880. This engine did not require a separate furnace like the steam engine as a result of which it was much smaller and lighter compared to a steam engine of equivalent horsepower. The modern engines are however far more efficient than the ones used in those...
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