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The difference between hard and soft water
Collect some hard water from a stream(or make some as defined in the next experiment). Also secure some soft water like as rain water or distilled water. Make some soap solution by dissolving soap shavings or powdered soap in a little warm water. Place equivalent amounts of hard and soft water in every of two bottles. Add soap solution to the soft water with a dropper, some drops at a time. Shake the bottle well after every addition. Count the number of drops of soap solution required to produce suds about 1 cm thick on the top.
To study the relation between volume and pressure of air Get a rubber bung or 'door stop' which just fits in a narrow glass jar or measuring cylinder. Attach it to the lowe
a ray of light falls on a transparent slab of refractive index u.if the reflected and refracted rays are mutually perpendicular to each other,find the angle of incidence.
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Question 1 Define Epidemiology and describe in detail about Disease frequency, Disease distribution and Disease determinants Question 2 Write a short note on mortality data a
a) Name the primary minerals present in an igneous rock. a ) Quartz (SiO2), feldspars, amphiboles, pyroxenes and micas are the most common primary minerals in igneous rock
The diagram below shows a baffled tank with a six blade turbine agitator: FIGURE 1 (a) Is a side view (b) Is a bottom view (c) Gives dimensions of the tu
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Which is NOT true about the concentration of methane gas in the atmosphere: It is generated as a byproduct of refrigerants and aerosols
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