True or false with reasons:1. Heat can’t travel in the vacuum 2. Gases expand the most while solids expand the least on heating 3. Room heaters warm the rooms by conduction 4. Blankets keep us warm at night in winters5. The wooden handle of a pressure cooker prevents conduction of heat to the hand

1. False. Radiation is the mode of heat transfer that takes place in a vacuum. Conduction and Convection do not occur in Vacuum but Radiation occurs
2. True. In gases, there are less intermolecular forces are very weak, so they expand easily on heating. In solids, the intermolecular forces are strong so they expand less
3. False. A room heater heats all the air in a room by setting up convection currents in the air.
4. True. Our body continuously generates heat due to metabolism. Blankets help us to retain the heat generated by our body and keep us warm at night in winters.
5. True. Wood is a bad conductor of heat. The wooden handle of a pressure cooker prevents conduction of heat from cooker to hand.

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Updated on: 10-Oct-2022

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