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तामिळनाडू बोर्ड ऑफ सेकेंडरी एज्युकेशनएस.एस.एल.सी. (इंग्रजी माध्यम) इयत्ता ९

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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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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Principle of Floatation (Laws of Flotation)
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 3: Fluids - Exercise [पृष्ठ ३७]

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सामाचीर कलवी Science [English] Class 9 TN Board
पाठ 3 Fluids
Exercise | Q IX. 3. | पृष्ठ ३७

संबंधित प्रश्‍न

A body is held immersed in a liquid. (i) Name the two forces acting on the body and draw a diagram to show these forces. (ii) State how the magnitudes of two forces mentioned in part (i) determine whether the body will float or sink in liquid when it is released. (iii) What is the net force on the body if it (a) sinks and (b) floats? 


A solid iron ball of mass 500 g is dropped in mercury contained in a beaker. (a) Will the ball float or sink? Give reasons. (b) What will be the apparent weight of the ball? 


A body floats in a liquid A of density ρ1 with a part of it submerged inside the liquid, while in liquid B of density ρ2 it is totally submerged inside the liquid. The densities ρ1 and ρ2 are related as : 


A weather forecasting plastic balloon of volume 15 m3 contains hydrogen of density 0.09 kg m-3. The volume of equipment carried by the balloon is negligible compared to its own volume. The mass of an empty balloon alone is 7.15 kg. The balloon is floating in air of density of 1.3 kg m-3. Calculate:

(i) The mass of hydrogen in the balloon,
(ii) The mass of hydrogen and balloon,
(iii) The total mass of hydrogen, balloon and equipment if the mass of equipment is x kg,
(iv) The mass of air displaced by balloon and
(v) The mass of equipment using the law of floatation.
 


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A test tube loaded with lead shots weighs 25 gf and floats upto the mark X in water. When the test tube is made to float in brine solution, it needs 5 gf more of lead shots to float upto level X. Find the relative density of brine solution.


Explain the following:

An egg sinks in fresh water but floats in a strong solution of salt.


How does an object’s density determine whether the object will sink or float in water?


Why do petroleum-based products float on the surface of the water?


Hydrometer is based on the principle of ______.


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