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प्रश्न
Write true or false for a given statement.
On touching a lump of ice, we feel cold because some heat passes from our body to the ice.
पर्याय
True
False
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उत्तर
True.
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संबंधित प्रश्न
Look at Figure. Mark where the heat is being transferred by conduction, by convection and by radiation.
Fill in the blank
A hot metallic piece is placed in tap water contained in a bucket. Heat will flow from _______ to _________
Select the correct alternative
The vacuum kept in between the walls of a thermos flask reduces the heat transfer by
Give one example of heat transfer by radiation.
How does a fever get lowered by putting a cold compress on the forehead of a patient?
Why are the houses in Rajasthan painted white?
What are the modes of heat transfer?
Why is the outer coat of the penguins of Antarctica black?
When ice changes into a liquid, it absorbs energy.
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.
