Advertisements
Advertisements
प्रश्न
______ of heat does not require a medium.
पर्याय
radiation
white
conduction
blue
convection
bad conductor
good conductor
black
reflection
Advertisements
उत्तर
Convection of heat does not require a medium.
Explanation:
In convection, when the temperature of a substance increases due to heat, its molecules move faster, causing them to rise. As a result, cooler and denser objects sink to the bottom. This process is possible only when a substance (liquid or gas) is present, as it requires the mobility and movement of molecules.
संबंधित प्रश्न
Stainless steel pans are usually provided with copper bottoms. The reason for this could be that ______.
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 ______
Select the correct alternative
The vacuum kept in between the walls of a thermos flask reduces the heat transfer by
Maximum heat is absorbed by a ______ coloured object.
How does a fever get lowered by putting a cold compress on the forehead of a patient?
Why are heaters fitted near the floor and air conditioners near the ceiling of a room?
The handles of cooking utensils are made of ______.
When a liquid boils, energy is absorbed.
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.
