Advertisements
Advertisements
प्रश्न
Why are chimneys provided over furnace in factories?
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
Write true or false for a given statement.
Telephone wires are kept tight between the two poles in summer.
Write true or false for a given statement.
Kerosene contracts on heating.
Write true or false for a given statement.
Land and sea breezes are convection currents of cold and warm air.
Select the correct alternative
The temperature of pure melting ice is
What do you understand by thermal expansion of a substance ?
Why are gaps left between successive rails on a railway track ?
State which expands more, when heated to the same temperature : solid, liquid or gas ?
In summer, ice is kept wrapped in a gunny bag. Explain the reason.
Why are quilts filled with fluffy cotton?
Why do we prefer to wear white or light coloured clothes in summer and black or dark coloured clothes in winter ?
