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Solar energy:
The energy we get today from the fossil fuels like coal, is in reality sun's energy, trapped in them millions of years ago. Plants make their food and grow because they use solar energy for photosynthesis. Millions of years ago, huge forests got buried in the earth's crust and under great pressure and temperature, they were converted into coal or oil. Hence coal and oil are called fossil fuels. Solar energy is the great source for production of vegetation which serves as food and fuel for us. However, nowadays, we have learnt to trap solar energy for various purposes. Solar energy can be used directly to give us hot water during winter, or run a refrigerator. It can be used for heating rooms in colder regions. It can also be used, with the help of a "photocell" to produce electricity for driving vehicles and illumination of streets. In a desert like Rajasthan, the earth's surface receives solar energy at the rate of 200 watts per square metre per hour. Since this is an unfailing source of energy, it would be a great advantage to develop cheap and efficient photocells or photovoltaic devices to harness solar energy. A feature of using solar energy is that it can be generated where needed. Solar cookers are being used in many homes to cook food. Photocells are also becoming common, though their efficiency has to be improved and their price brought down.
Reduction reaction Aldoses and ketoses are reduced to the corresponding polyhydroxy alcohols by sodium borohydride, sodium amalgam, etc. So, in this reaction, glucose
Dissolution and dilution : Water soluble1 miscible chemical wastes which are harmless in high dilution may be run into the drainage with plenty of water. It may be noted that al
For the model of Fall River and Butte Creek in HEC-RAS, (a) Output the cross-section of all three flood events for station 9.8 on one figure. Include only the water surface and
Physico-chemical properties of vitamin E are as follows: a) Tocopherols are yellow, oily liquids. b) They are freely soluble in fat solvents. c) The compounds are
Treatment of soil sickness Due to overuse without rest, soil becomes deficient in the requisite nutrients and loses its fertility. Rotation of crops and vegetables, such as
Define the Blood Groups We start our discussion by answering the question - do all of us have the same blood group? No, each individual has a different blood group. The differ
what is monera
Define age related changes in Cardiovascular system There is a decrease in elasticity of the aorta and other large arteries as age increases. Thickness of blood vessels increas
Dilute hydrochloric acid (HCl) oxidizes only the terminal -CH20H group with the formation of uronic acid. Glucose is thus oxidized to glucuronic acid.
Enchinoderms classification for kingdom,Phylum,Class,Order,Family,Genus,Species
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