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Making a simple reflecting telescope
A simple reflecting telescope can be made from a concave mirror obtained from a shaving mirror. The mirror is arranged wooden box of suitable size in such a way that it can be tilted at dissimilar angles. An upright made of wood is attached to the box so that its angle may also be varied. Two short focus lenses are fixed in corks which are then placed in a short length of mailing tube as an eye-piece. Then join this eye- piece attached to the wood upright exactly at the focal
Explain the Nephrotic Syndrome A type of nephritis (an inflammation of the kidneys) that is characterized by low serum albumin, proteinuria and swelling (oedema). Swelling, wei
Explain Rh Blood Grouping System Some individuals also have a so called Rh antigen on the surface of their RBCs. Those who have it are called Rh (+) and those who do not have i
Explain Maintenance of pH - Functions of Bile Maintenance of pH: Bile neutralises the hydrochloric acid and helps to maintain a suitable pH. This prevents the injurious effects
Explain Bile - External Defence Mechanism It is an alkaline secretion of the liver, which checks the growth of foreign bacteria on the partially digested food.
Poisons : It is essential that all dangerous substances, such as cyanides, are always kept under strict control. Steps to ensure such control are as follows: i) All substances
How Complement System Helps To Handle Microbial Invasion 1) Some components of a complement system coat microorganisms. These organisms with such a coat can be easily phagocyt
Conducting experiments on animals (i) The qualifications or experience of the person(s) performing experiments on animals. (ii) Comfortable conditions provided, and animals
two forces of magnitude 6 N and 4 N act on a 3.2 kg. body. What is the acceleration produced when these force are acting in the same direction? What it the acceleration produced wh
Improvement of Techniques and Crafts : In this period, there was a spurt in agriculture, as new techniques and seeds were introduced. More importantly, the crafts greatly improv
Explain Gut secretions - External Defence Mechanism From the saliva and respiratory tract, bacteria reach the gut, here they are killed by the hydrochloric acid and proteolytic
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