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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
A block of wood is so loaded that it just floats in water at room temperature. What change will occur in the state of floatation, if
(a) Some salt is added to water, (b) Water is heated?
Give reasons.
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.
Explain the following :
Icebergs floating in sea are dangerous for ships.
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 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.
State the principle of floatation. What can you say about the average density of a ship floating on water?
Explain the following:
Icebergs floating in the sea are very dangerous for ships.
Name different types of Hydrometers with their applications.
Differentiate positive & negative buoyant.
