World Geography
The main objective of multi-purpose river projects are

flood controls and making rivers navigable
All of these
power generation by constructing hydro power stations
extension of irrigation facilities by constructing dams to store surplus water during the rainy seas

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World Geography
The initial increase of magnetic field in magnetic storms is caused

when the gust wind itself engulfs the magnetosphere
when there is a large decrease in field intensity
when the shock wave, associated with the gusty solar wind, compresses the magnetosphere
None of these

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