Advertisements
Advertisements
प्रश्न
Why are chimneys provided over furnace in factories?
Advertisements
उत्तर
Chimneys are provided over the furnace in factories. This is because the hot gases coming out of the furnace are less dense than the air. They rise up through the chimney. The smoke, fumes etc. around the furnace rush in so as to take their place and they are sucked out. Thus, the chimney helps to remove the undesired fumes, smoke etc. from the premises.
APPEARS IN
संबंधित प्रश्न
Fill in the blank
_________ determines the degree of hotness or coldness of a body.
Fill in the blank
On heating a body, its temperature _______.
Fill in the blank
Liquids expand _______ than the solids.
Fill in the blank
Metals are _______ of heat.
Fill in the blank
Black and dull surfaces are ______ of heat.
Why is a cement floor laid in small pieces with gaps in between?
Describe one experiment to show that liquids expand on heating.
State one application of thermal expansion of liquids.
Name a solid which is a good conductor of heat.
Select good and bad conductors of heat from the following:
copper, mercury, wood, iron, air, saw-dust, cardboard, silver, plastic, wool.
