71. Which of these liquids has the highest viscosity?
72. The absorption of ink by blotting paper involves
73. Water from soil enters into the root hairs owing to :
74. Which of the following liquids has the least density ?
75. A small drop of oil spreads over water because :
76. Two rods, one of copper and other of steel, experience the same upthrust when placed in water.Thus, both have
77. If ice floating on water in a vessel melts, the water level in the vessel ________ .
78. On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because
79. The velocity of falling rain drops attains a terminal value because of
80. Which one is the unit of surface tension of a liquid
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