61. If an ordinary glass tube and a glass capillary tube are both dipped in a beaker of water, water rises in
62. Surface tension in a liquid is due to :
63. 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
64. The oil in the wick of an oil lamp rises up due to:
65. Fog is an example of
66. If the diameter of a capillary is doubled, then the rise of water in it will be
67. A needle or a pin floats on the surface of water because of
68. Materials for rain proof coats and tents owe their water proof properties to
69. Soap bubble attains spherical shape due to ________
70. Water drops cannot stick to the oily surface due to
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