61. In a railway track, two rails are joined end to end with a gap in between them because
62. Air coolers are more suitable for
63. We feel cool when we sit near the fan, this is because
64. When hot-water is sprinkled on a hotter glass tumbler, it breaks because
65. A gap is left between two rails of a railway track to accommodate...... of the metal.
66. Which of the following is arranged in order of decreasing conductivity?
67. Every hot object emits ________
68. Which metal is the best conductor of heat?
69. When hot liquid is poured into a thick glass tumbler, it cracks because glass :
70. Mud houses are cooler in summers and warmer in winters as compared to brick houses because
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