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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
Give two examples each of conductors and insulators of heat.
Select the correct alternative
Heat in a liquid is transferred by
Why is the freezing chest in a refrigerator fitted near its top?
Explain briefly the process of heat transfer by radiation.
Maximum heat is absorbed by a ______ coloured object.
Conduction of heat takes place through a ______ substance.
The earth receives heat from the sun by ______.
Heat is the transfer of energy between two objects at different temperatures.
Wrap a thin paper strip tightly around an iron rod. Try to burn the paper with candle while rotating the iron rod continuously. Does it burn? Explain your observation.
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.
