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

Steam Locomotives The first steam locomotive was built by George Stephenson in the year 1825 and was called ‘Locomotion’. The steam locomotive simply defined is a large water boiler on wheels. The front of the engine comprises of a boiler which houses a large number of metal tubes, in the middle is the driver’s cab and in the rear is a separate cab in which coal is carried. Water is filled...
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Paragraph on “Automobiles Technology” complete paragraph for Class 9, Class 10, Class 11 and Class 12

Automobiles Technology The first cars were developed in the 18th century with steam engines. Modern day cars have internal combustion engines which comprise of a number of air tight chambers in which a series of flat topped pistons are located. The lower end of these pistons is connected to a shaft which allows them to move up or down within the cylinder. A mixture of petrol and air is sprayed into...
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Paragraph on “Motorcycles” complete paragraph for Class 9, Class 10, Class 11 and Class 12

Motorcycles The first motorcycle was built in the year ‘1885 by a German called Gottlieb Daimler. It was a very crude version of the modern day motorcycle, it was only a wooden bicycle frame fitted with a small petrol engine. Today motorcycles in contrast are complicated machines. They have engines which are similar to a car but smaller in size and are generally two stroke or four stroke internal combustion air...
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Paragraph on “Computers” complete paragraph for Class 9, Class 10, Class 11 and Class 12

Computers   Computers are capable of doing small things like playing games to bigger ones like guiding a spacecraft in outer space. Simply put, the computer is like a storage cabinet which is capable of storing data in an organised manner, besides this it is also capable of accessing the data very quickly and also analysing it based upon our requirements. The description may seem fascinating but a computer is not...
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Paragraph on “Telephone” complete paragraph for Class 9, Class 10, Class 11 and Class 12

Telephone The invention which transformed the world of communication, the Telephone, was invented by Alexander Graham Bell. Its frequent use has today made it an inseparable part of our lives and we hardly stop to think how it may work. Telephones are made in various shapes and sizes but some of the essential features include a circular or push button dialling pad and a hand piece alongwith a base unit, in...
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Paragraph on “Washing Machine” complete paragraph for Class 9, Class 10, Class 11 and Class 12

Washing Machine Washing of clothes is carried out by forcing detergent and water through them with the hands. In a washing machine the activity of the hands is substituted by the rapid movement of the machine either with the help of a rotating agitator arm or in a cylinder equipped with fins. Once the dirty laundry is put into a machine, adequate quantity of detergent is put into a compartment. A...
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Paragraph on “Microwave Ovens” complete paragraph for Class 9, Class 10, Class 11 and Class 12

Microwave Ovens Various types of ovens are used for a variety of purposes but the latest addition to household appliances is the Microwave oven. Unlike gas and electric ovens, which cook or heat food by increasing the temperature, the Microwave ovens generate electromagnetic waves with the help of a magnetron tube. These waves agitate food molecules by inverting them, this disturbance results in friction thus causing the food to heat up...
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