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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.
Starch is not soluble in water ?? It forms colloid in aqueous medium called as micelles. Iodine reacts with both amylose and amylopectin, but the former produces a co
Modern Concept of Preventive Medicine: Now let us see how the current concept of preventive medicine came into being. The story began only 150 years ago. People returning
3 human adaptations to help differential survivability, and three re differential fecundity
role of scial science in human behaiver
Stellar Motion: Stars are not fixed in the heavens. They are moving within the galaxies. The speed of a star moving toward or away from the Earth is indicated by a shift of
What is Synthesis of Specialized Products from Amino Acids In addition to serving as building blocks for proteins, amino acids are precursors of many nitrogen containing compou
What is Tongue? The tongue is a major organ. You will agree that the tongue precisely reflects the state of our digestive system. How? Well, you may have experienced that occas
Question: a) How does temperature changes in the stratosphere? Give a physical explanation and illustrate your answer using a diagram. b) Write a short note on ozone in the
Some Physical Features of the Oceans: The oceans are so vast that they stagger one's imagination. They cover more than 70 per cent of the earth's surface. The depth of ocean
Judicious use of Plant/Animal Material for Lab. Purposes Live or preserved biological material is an essential requirement in all bio-labs. This material needs to be brought in
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