81. A small gap is left at the joints of rails in a railway track to
82. Pipelines in cold countries often burst in winter, because
83. In severe winter, in cold countries water pipes burst because
84. Railway tracks are banked on curves so that
85. The density of the liquid when heated
86. Thermocouple consists of
87. Water has maximum density at
88. When water freezes its density
89. Which of the following are methods of heat transfer?
90. Heat energy is transferred by conduction whenever molecules
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