Advertisements
Advertisements
प्रश्न
Look at Figure. Mark where the heat is being transferred by conduction, by convection and by radiation.

Advertisements
उत्तर
- Convection is taking place in boiling water.
- The heat coming into the stove is coming by conduction.
- The heat around the stove and utensils is coming from radiation.

APPEARS IN
संबंधित 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.
Write true or false for a given statement.
Liquids are heated by conduction and radiation.
Write true or false for a given statement.
Black surfaces are the poor absorbers of heat radiations.
Fill in the blank
Heat transfer in solids is by ______
Fill in the blank
Heat transfer in liquids and gases is by ________.
Select the correct alternative
Heat in a liquid is transferred by
Conduction of heat takes place through a ______ substance.
Why are the houses in Rajasthan painted white?
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.
