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प्रश्न
Select the correct alternative
In the process of convection, heat travel
पर्याय
sideways
downwards
upwards
in all directions
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उत्तर
upwards
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संबंधित प्रश्न
Look at Figure. Mark where the heat is being transferred by conduction, by convection and by radiation.
Write true or false for a given statement.
Black surfaces are the poor absorbers of heat radiations.
Maximum heat is absorbed by a ______ coloured object.
The earth receives heat from the sun by ______.
Explain which mode of heat transfer causes sea breezes and land breezes.
Why is the outer coat of the penguins of Antarctica black?
Why are heaters fitted near the floor and air conditioners near the ceiling of a room?
Heat is the transfer of energy between two objects at different temperatures.
When a liquid boils, energy is absorbed.
Take two similar transparent glass bottles having wide mouths. Put a few crystals of potassium permanganate or pour a few drops of ink in one bottle. Fill this bottle with hot water. Fill the other bottle with cold water. Cover the cold water bottle with a thick piece of paper such as a postcard. Press the postcard firmly with one hand and hold the bottle with the other hand. Invert the bottle and place it on top of the hot water bottle. Hold both the bottles firmly. Ask some other person to pull the postcard. Observe what happens. Explain.
