21. When a ring of metal is heated what happens to its hole ?
22. The earth is a
23. When temperature difference between liquid and its surroundings is doubled, the rate of loss of heat will:
24. The word ''insolation' means
25. Tap water is placed in an open pad and allowed to evaporate. After some time the temperature of water
26. Heat is transmitted from higher temperature to lower temperature through the actual motion of the molecules in
27. Energy travels from Sun to Earth through
28. Which best describes how air moves during convection?
29. When does land breeze occur?
30. The cooling by a desert Cooler is based on:
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