Advertisements
Advertisements
प्रश्न
Select the correct alternative
If we add a lump of ice to a tumbler containing water,
पर्याय
heat flows from water to ice
heat flows from ice to water
heat flows from water to ice if water is more
heat flows from ice to water if ice is more
Advertisements
उत्तर
heat flows from water to ice
APPEARS IN
संबंधित प्रश्न
Look at Figure. Mark where the heat is being transferred by conduction, by convection and by radiation.
Stainless steel pans are usually provided with copper bottoms. The reason for this could be that ______.
Fill in the blank
Heat transfer in liquids and gases is by ________.
Select the correct alternative
In the process of convection, heat travel
Select the correct alternative
The vacuum kept in between the walls of a thermos flask reduces the heat transfer by
Explain briefly the process of heat transfer by radiation.
Maximum heat is absorbed by a ______ coloured object.
The earth receives heat from the sun by ______.
Take a sheet of paper. Draw a spiral on it as shown in Figure. Cut out the paper along the line. Suspend the paper as shown in Figure above a lighted candle. Observe what happens. Think of an explanation.
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.
