51. A hydrogen balloon floats up because of
52. A boat will submerge when it displaces water equal to its own:
53. What is the principle of a ''Life Jacket"?
54. When a piece of stone is immersed in water, it displaces water of equal
55. It is easier for a man to swim in sea water, than in river water because
56. A piece of wood is held under water. The upthrust on it will be:
57. An egg sinks in soft water but floats in a concentrated solution of salt because
58. When a ship enters the sea from a river what will be the effect?
59. Two identical solid pieces, one of gold and other of silver, when immersed completely in water exhibit equal weights. When weighed in air (given that density of gold is greater than that of silver)
60. When a body is immersed in a liquid, the force acting on it is
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