61. Calculate the pressure (in Pa) if a thrust of 1000 N is applied to an area of 5 m2.
62. 200 gm of water is filled in a weightless balloon. Its weight in water will be
63. A deep sea diver may hurt his ear drum during diving because of
64. If the amount of water vapour in the air is high, what will be the rate of evaporation-
65. Four wires of same material and dimensions as mentioned below are stretched by a load of same magnitude separately. Which one of them will be elongated maximum?
66. Fish can survive in a frozen lake because
67. An application of Bernoulli's equation for fluid flow is found in
68. Which of the following is not based on the principle of Archimedes?
69. What is another name for the buoyancy force exerted by water to a submerged body?
70. If an unsaturated sugar solution is prepared by mixing 100 grams of sugar with half litre of water, which of the following physical quantities will not change?
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