55.A person does not sink in the Dead Sea because
   (a) the sea contains a large amount of other salts besides sodium chloride
   (b) the density of the person is less than the density of the Dead Sea water
   (c) of the surface tension due to salt water in the Dead Sea
   (d) of difference in mass
Ans: (b)
56.A ship sailing from a river to the sea
   (a) sinks less in the sea
   (b) sinks more in the sea
   (c) neither sinks more nor less in the sea
   (d) sinking more or less depends on sea
Ans: (a)
57.When a body is partly or wholly immersed in a liquid the apparent loss of
   weight is equal to the weight of the liquid displaced by the submerged
   portion. This is known as
   (a) Pascal"s law
   (b) Bernoulli"s law
   (c) Archimedes" law
   (d) Boyle"s law
Ans: (c)
58.A bucket of water is hung from a spring balance. A piece of iron is
   suspended in the water without touching the sides or touching the bottom of
   the bucket. The reading of the spring balance
   (a) will increase
   (b) will decrease
   (c) does not change
   (d) varies with the increase of depth of the immersion of the iron piece
Ans: (a)
59.A boat loaded with rocks floats in the middle of a swimming pool. A man in
   the boat throws the rocks overboard. The level of water in the pool will
   (a) increase
   (b) decrease
   (c) remain the same
   (d) first decrease and then increase
Ans: (b)