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प्रश्न
Explain the following:
A hydrometer is made heavy near the bottom.
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उत्तर
The bottom of the hydrometer is made heavier by loading it with lead shots so that it floats vertically with some of its portion outside the surface of the water in the jar.
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संबंधित प्रश्न
Explain the following :
Icebergs floating in sea are dangerous for ships.
For a floating body, its weight W and upthrust FB on it are related as :
A test tube weighing 17 gf, floats in alcohol to the level P. When the test tube is made to float in water to the level P, 3 gf of the lead shots are added in it. find the R.D. of alcohol.
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.
A block of wood of volume 25 cm3 floats in water with 20 cm3 of its volume immersed in water.
Calculate:
(1) density of wood
(2) the weight of block of wood.
Name an instrument based on this principle. State two uses of the instrument that you describe.
Explain the following:
Icebergs floating in the sea are very dangerous for ships.
Why does a helium balloon float in air?
Name different types of Hydrometers with their applications.
Describe the purpose, principle, and working of the Lactometer.
