1. Tardigrade
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  3. Physics
  4. Assertion: Sky wave signals are used for long distance radio communication. These signals are in general, less stable than ground wave signals. Reason: The state of ionosphere varies from hour to hour, day to day and season to season.

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Q. Assertion : Sky wave signals are used for long distance radio communication. These signals are in general, less stable than ground wave signals.
Reason : The state of ionosphere varies from hour to hour, day to day and season to season.

AIIMSAIIMS 2018Communication Systems

Solution:

Correct answer is (a) If both assertion and reason are true and reason is the correct explanation of assertion