Physics
The ''Greenhouse effect' is mainly due to increase in atmospheric

Nitrogen
Ozone
Sulphur dioxide
Carbon dioxide

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Physics
In the process of magnetisation of a bar

Only the surface of the bar gets magnetised
Only some parts of the outer layers of the bar get magnetised
Only the ends of the bar get magnetised
The entire bulk of the bar gets magnetised

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Physics
Light houses are places with powerful lights to :

Guide and help large crowds at religious gathering during nights
Indicate to the incoming warships, the location of a harbour during night
Guide and warn the ships coming from different directions in the ocean
Guide and resolve traffic jams in crowded metro-cities during nights

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