World Geography
The steady or initial phase of the magnetic storms is

a sharp increase of the field
None of these
magnetic storm at middle and low altitudes
preceded by storm sudden commencement

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

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

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World Geography
The rate of infiltration normally declines rapidly during the early part of rainstorm event and reaches a constant value after several hours of rainfall. The factors responsible for this phenomenon are I. the filling of fine soil pores with water, which reduces capillary forces II. moistened soil, clay particles to swell and reduce the size of pores III. raindrop impact breaking up with soil clumps, splashing fine particles into pores

II, III
I, II
All of these
I, III

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