81. The cloudy nights are warmer than clear nights because
82. Woollen clothes keep the body warm because
83. The cooling by a desert Cooler is based on
84. What is the function of the thermostat of a refrigerator?
85. A circular plate, a cube and a sphere all made up of same material and having the same mass, are heated to 300°C and left in a room. Which of them will have the slowest rate of cooling?
86. Which of the following is a good conductor of heat but bad conductor of electricity?
87. The difference in temperature between two bodies is 30° C. What is the difference in degree Fahrenheit?
88. Consider the following statements.
Assertion (A): Space based solar power (SBSP), it is suggested be made a national goal.
Reason (R): Supply of SBSP is 99% uninterrupted throughout the year, besides the enormity of energy availability.
Select the correct answer:
Assertion (A): Space based solar power (SBSP), it is suggested be made a national goal.
Reason (R): Supply of SBSP is 99% uninterrupted throughout the year, besides the enormity of energy availability.
Select the correct answer:
89. When a piece of ice floating in a glass of water melts, the level of water will
90. We feel cool when we sit near the fan, this is because
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