World Geography
The magnetic field of earth, Magnetosphere expands to about

None of these
64,000 km above the earth's surface
9600 km above the earth's surface
8000 km above the earth's surface

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

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

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