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Cement and concrete
Secure a small bag of Portland cement. Have the pupils mix it with water and put it in tin can covers, paper cups, or small pasteboard boxes unless it hardens. Study its appearance and its properties. Break a piece of cement and study it. Mix the dry cement with about twice as much sand or gravel. This will form concrete. After adding water and mixing thoroughly place it in moulds. Permit these to arden various days. Again study the appearance and the characteristics of these samples.
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
Energy Flow in the Ecosystem The principal source of energy for any ecosystem is sunlight. All food materials that we or other animals consume are manufactured directly or i
What is the only usual mineral to be strongly magnetic other than magnetite: Pyrrhotite
Explain the Sexually Transmitted Infections These include, for example, chlamydial infection, gonorrhoea, trichomniasis, syphilis, chancroid, genital herpes, genital warts (ca
To measure the volume of air in the longs Invert a bottle full of water so that its neck is in the surface of water in ajar. Introduce a glass or rubber tube into the neck and
Explain the Radioactive Red Blood Cells In order to make red blood cells radioactive, tagging of red blood cells with radioactive chromium ( 51 cr) is done. A small quantity of
ACTIVITY 1 TO CALCULATE CURRENT DRAWN BY THE GIVEN APPLIANCES AND SUGGEST PROPER FUSE RATING AND PLUG TYPE Here , you hence learnt how to calculate the current drawn by an
Flammable Liquids : Bulk supplies of all flammable liquids should be kept in a solvent store well away from main buildings. The store should be securely locked and fire warning no
what are the list of animals of nematoda
what is ecology
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