Solve this :

70. When all ice floating in water melts the level of water in container
(a) falls                                                   (b) rises
(c) remains unchanged                           (d) none of these                               

71. A jet plane flies in air because
(a) Streamlined flow of air causes lift
(b) upward thrust of air balances its weight
(c) No gravity acts on plane
(d) None of these 

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