When did wool first become widely used? Ever since the days of Ancient Greece, wool has played a very important part in clothing. Roman togas were made of wool and it continued to be woven during the Dark Ages. In fact, it was the only material available to most people. The woollen clothes worn during the first half of the Middle Ages were simple and made for warmth. Houses and...
Continue reading »
September 13, 2017 evirtualguru_ajaygourParagraph WritingNo Comment
Who wove the finest linen in the Ancient World? The ancient Egyptians grew an enormous amount of flax which was then spun and woven into linen. Linen is strong and cool and smooth to wear, and Egyptian linen was incredibly fine, sometimes almost trans-parent. This fine weaving has never been matched, even with the advanced machines used in textile mills today. It was the quality of material that distinguished the...
Continue reading »
September 13, 2017 evirtualguru_ajaygourParagraph WritingNo Comment
When did man first wear clothes? Look at the clothes you are wearing, you will ‘ find that they are made of a great variety of fabrics. We are fortunate that they are all available, imagine what it must have been like with nothing to protect you from the bitterest weather! We do not know when man first wore clothes, but large numbers of flint scrapers found in Old Stone...
Continue reading »
September 13, 2017 evirtualguru_ajaygourParagraph WritingNo Comment
What other kinds of energy can we use? You have seen in the previous question the stages through which the Sun’s energy passes before we can tap it as the fossil fuel, petrol. It has taken millions of years for the world’s reserves of oil to be built up and we have consumed much of it in a few decades. We need energy in our homes and in industry and for...
Continue reading »
September 13, 2017 evirtualguru_ajaygour10th Class, 9th Class, Class 11, Class 12, General Knowledge, Paragraph WritingNo Comment
How does the Sun power a Racing Car? A racing car as you know has a petrol-driven engine. The petrol is a fossil fuel ultimately depending on the Sun’s energy, as we shall see. On a sunny day you can feel the Sun’s rays warming your face. The Sun is applying energy in the form of heat. Solid as it may look, the Sun is completely made up of gas, so...
Continue reading »
September 13, 2017 evirtualguru_ajaygour10th Class, 9th Class, Class 11, Class 12, General Knowledge, Paragraph WritingNo Comment
How do we know what the bottoms of oceans are like? Over two-thirds of the Earth’s surface is covered with water. Most of this is very deep and we call it ocean. People cannot go down very far because the pressure of the water on them increases the deeper they go. Deep-sea divers wear protective clothing to stop their bodies being crushed. However, people have gone down to great depths using...
Continue reading »
September 13, 2017 evirtualguru_ajaygour10th Class, 9th Class, Class 11, Class 12, General Knowledge, Paragraph WritingNo Comment
Why do we build dams? Man-made dams are large walls built across rivers or lakes so that the water builds up on one side of them. The water can be let out of the dams if required. Dams are useful to us in many ways. We need water to drink and to grow our food but in many parts of the world, at different times, there is sometimes too much water...
Continue reading »
September 13, 2017 evirtualguru_ajaygour10th Class, 9th Class, Class 11, Class 12, General Knowledge, Paragraph Writing1 Comment
Can water climb? Water usually flows downwards, pulled by the force of gravity. However, in certain circumstances, it can move upwards or climb! If you place a thick and a thin plastic straw in a beaker of coloured Water, the water will rise up the straws above the level of the water in the beaker. The water will rise further up the thin straw than the thick straw. The ability...
Continue reading »
September 13, 2017 evirtualguru_ajaygour10th Class, 9th Class, Class 11, Class 12, General Knowledge, Paragraph WritingNo Comment