71. During hot weather, the fan produces a feeling of comfort. This is because
72. The flow of thermal energy is called
73. On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because :
74. Which of the following is an insulator?
75. 'Therm' is the unit of
76. Heat flows as a result of difference of ________
77. Light beam which is highly directional is called:
78. Speed of light is maximum in ________
79. Light travels in a straight line (rectilinear propagation of light). This statement does hold if the medium of travel for light is
80. The speed of light will be minimum while passing through
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