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Plaster of Paris
Secure some plaster of Paris and mix a small amount with water. It must be worked quickly or it will harden whereas being mixed. Place the mixture in moulds and let it set unless very hard. Study the appearance and properties of the samples. 3 Collections of building materials Collect samples of all the dissimilar types of rock or mineral building materials available in your locality like as marble, granite, slate, limestone, brick, cement, plaster, etc. These may be added to your collection after proper labels have been close to the samples
How soap acts towards fat Prepare another jar with warm water and oil just as you did in the experiment above. This time add about half a cup of either liquid soap or strong so
Beneficial Role of Soil Organisms The soil organisms play a significant role in the life cycles of plant and animals through decomposition, synthesis and transformation, in wh
Define the term Bel Bel, the unit of measurement of sound, is named after Alexander Graham Bell; Bell was the inventor of the telephone, but for some curious reason, is spelt w
Explain Vagus Nerve - Neural Control of Respiration The rhythm and depth of respiration are controlled by the reflexes from the vagus nerve. When the lungs are inflated, the
Explain Sinus Bradycardia - Electrocardiogram If the SA node discharge rate is slow, the heart rate is slow. ECG is normal in every respect except that the heart rate at rest i
State of Communication in the Past: Those of us who have experience of life in remote villages, far away from urban centres, are familiar with such features as poor roads whi
Define Unicellular Organisms and Multicellular Organisms You may be aware that some organisms are made up of only one cell, while others have more than one cell. Well, the sing
Explain causes of Fever - Immune System We have seen that due to injury, cut or bite, the inflammatory response develop and this is localized or systemic. The localized respons
Explain parasympathetic Nerves System Another system that runs parallel to the sympathetic system is termed as the parasympathetic system. This system has an effect just opposi
Why did the continents spread apart? This is because of the heat generated from the earth's interior and earthquakes - the convection currents deep within the earth due to the
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