71. It is difficult to cook rice
72. Which of the following principles does the refrigerator work on?
73. On which we gets the absolute zero pressure?
74. Blowing air with open pipe is an example of
75. Statement I While putting clothes for drying up, we spread them out.
Statement II The rate of evaporation increases with an increase in surface area.
Statement II The rate of evaporation increases with an increase in surface area.
76. During the melting of solid, its temperature
77. The amount of heat required to change a liquid to gaseous state without any change in temperature is known as
78. To convert the temperature taken on the Kelvin scale to the Celsius scale-
79. Why boiling point of water decreases at high altitudes?
80. The lowest temperature is recorded by
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