Radio waves are reflected back by:
(a) Mesosphere
(b) Stratosphere
(c) Troposphere
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The hymns of Rig Veda are the work of: (a) One author (b) Four authors (c) seven authors (d) many authors
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Lines connecting places with of equal atmospheric pressure are called: (a) Isobars (b) Isohalines (c) Isotherms
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