AIEEE 2011 Solved Paper

This question has Statement - 1 and Statement - 2. Of the four choices given after the statements, choose the one that best describes the two statements.
Statement −1 : Sky wave signals are used for long distance radio communication. These signals are in general, less stable then ground wave signals.
Statement −2 : The state of ionosphere varies from hour to hour, day to day and season to season.