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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.
A lamp chimney lift pump Use a straight-sided lamp chimney as a pump cylinder. Fit a two-hole stopper into the chimney for a piston. If the stopper is a little small wrap some
A self-starting siphon Secure a piece of glass or plastic tube about 2.5 cm in diameter and 8 to 10 cm in length. Fit single end with a one-hole stopper, carrying a short lengt
The important physico-chemical properties of thiamin are as follows: a) Thiamin hydrochloride is a white, needle-shaped crystalline substance. b) It has a characteristic sm
Explain Interferon Interferon interferes with viruses (hence the name) and is produced by most cells in the body. Interferons, like antibodies and complements, are proteins, an
What are the ratios allowed for three year olds and Child Care Centers in Colorado and what is the citation of the rules that addresses ratios?
Explain the Alpha Fetoprotein Screening (AFP) This is a blood test that measures the level of alpha-fetoprotein in the mothers' blood during pregnancy. AFP is a protein normall
Objectives After studying this unit, you should be able to: 1. explain the need for reporting lab accidents, 2. state the accident reporting procedure, 3. list the
Explain the Constituents and Examination of Urine The quantity of urine in 24 hours in adult normal individual varies from 600 ml to 2500 ml. It is pale yellow in colour, hyper
Mr. X is probably well adjusted (Mt=42). Neither he nor others see him as anxious (Pt=59), and he either denies or does not experience depressiveness (DEP=41). He does not wake up
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