71. Ohm's law is valid in case of
72. Electrical burns occur principally because of
73. The SI unit of resistance is:
74. Electrical Energy is the energy of
75. As water is cooled from 4 deg C to 0 deg C, its density
76. Fish and other aquatic creatures can live inside a deep frozen pond because
77. The density of a gas is maximum at
78. Lakes freeze in cold countries in winter, leaving the water underneath at
79. A bimetal made copper and iron strips welded together is straight at room temperature. It is held vertically with iron strip towards left and copper strip towards right. If this bimetal is heated, it will
80. Thermal expansion of materials arises from
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