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प्रश्न
If you put one ice cube in a glass of water and another in a glass of alcohol, what would you observe? Explain your observations.
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उत्तर
Ice floats in water and not in alcohol. This is because the density of ice is `"0.917g"/"cc"` which is lower than that of water which is 1. Whereas, the density of ethanol (alcohol) is only `"0.789g"/"cc " `which is lesser than ice, hence it floats in alcohol.
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संबंधित प्रश्न
State the principle of floatation.
Draw a diagram to show the forces acting on a body floating in water with its some part submerged. Name the forces and show their points of application. How is the weight of water displaced by the floating body related to the weight of the body itself?
A piece of ice floating in a glass of water melts, but the level of water in the glass does not change.
Give reasons.
Hint: Ice contracts on melting.
A hollow metal cylinder of length 10 cm floats in alcohol of density 0.80 g cm-3, with 1 cm of its length above it. What length of cylinder will be above copper sulphate solution of density 1.25 g cm-3?
A test tube loaded with lead shots, weighs 150 gf and floats upto the mark X in water. The test tube is then made to float in alcohol. It is found that 27 gf of lead shots have to be removed, so as to float it to level X. Find R.D. of alcohol.
Explain the following:
An egg sinks in fresh water but floats in a strong solution of salt.
Hydrometer is based on the principle of ______.
Where do we use lactometers?
Differentiate positive & negative buoyant.
