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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.
Explain Light source - Pre-requisites of Colour Perception No colour may be detected by the eyes or by an instrument in the dark i.e. in the absence of a light source emitti
Question: a) Define atmospheric pressure, stating clearly its unit in meteorology. The atmospheric pressure at the foot of hill is 1013 hPa. What would be the pressure at th
Define Age Related Changes in Blood Blood: Here the haemopoiesis (the formation of blood cells) slows down. Fatty marrows replace the heamopoietic (red) marrow. Thus, the proli
Fingerprinting the Stars: Astronomers use various methods to measure the distances to stars. For determining the distances to nearby stars, the method of stellar parallax is
Define age related changes in Nervous system Varying degrees of atrophy in neuronal areas can be observed neurotransmitter functions are hampered. The cholinergic deficits seen
Medieval Science: We can record the sum total of the medieval achievement in the natural sciences in a few lines. It can be put down as a few notes on natural history a
What is the literal translation of the word catholic?
Decay of Arab Culture and Science: The association of science with kings, wealthy merchants and nobles which was initially very fruitful, ultimately proved to be the weakness
can anyone tell me at least three adaptation that help humans have differential survivability, and three adaptations that help humans have differential fecundity? any help
Use of Fire Extinguishers : We know that one type of fire extinguisher cannot serve the purpose on all kinds of fire. In this subsection you will study about the use of different
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