Advertisements
Advertisements
प्रश्न
Write true or false for a given statement.
Liquids are heated by conduction and radiation.
पर्याय
True
False
Advertisements
उत्तर
False.
APPEARS IN
संबंधित प्रश्न
Give two examples each of conductors and insulators of heat.
Look at Figure. Mark where the heat is being transferred by conduction, by convection and by radiation.

Select the correct alternative
Heat in a liquid is transferred by
Explain briefly the process of heat transfer by radiation.
Why is the outer coat of the penguins of Antarctica black?
Heat is the transfer of energy between two objects at different temperatures.
When ice changes into a liquid, it absorbs energy.
When a liquid boils, energy is absorbed.
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.
