Page 1 :
CLASS:V, LESSON-15, , BLOW HOT, BLOW COLD, , I ANSWER THE FOLLOWING, , 1. What is evaporation?, Ans: Evaporation is the process by which water changes into water vapour on, heating., 2. What is condensation?, Ans: Condensation is the process where water vapour becomes liquid on cooling., It is the reverse process of evaporation., 3. Write any five wind instruments., Ans: 1) Flute, 2) Clarinet, 3) Trumpet, 4) saxophone, 5) Bagpipe., 4. How do you cool some food, when it is too hot?, Ans: When a food is too hot, we cool it in the following ways., i) Blowing air with mouth., ii) Pouring it in broader vessel., iii) Leaving it under the fan for some time., , 5. How does the air from mouth help in cleaning the spectacles?, Ans: Some people blow on their spectacles to wipe them clean. Air we blow, from mouth is wet and helps in cleaning the glass., , *********************