Statement - 1 : Sky wave signals are use...

Statement - 1 : Sky wave signals are used for long distance radio communication. These signals are in general, less stable than ground wave signals. Statement - 2 : The state of ionosphere varies from hour to hour, day to day and season to season.

Statement -1 is true , Statement -2 is true , Statement -2 is the correct explanation of Statement -1.

Statement -1 is true , Statement -2 is true , Statement -2 is not the correct explanation of Statement -1 .

Statement -1 is false, Statement -2 is true .

Statement -1 is true , Statement -2 is false.

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The correct Answer is:

Since ionospheric properties change with time, these signals are in general less stable than ground wave signals.

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The waves used for the line - of - sight (LOS) communication is

space waves

sky waves

ground waves

sound waves

these lights have beautiful colouration

these are visible from long distance

these can penetrate through fog and mist

both (2) and (3) are correct reasons.

placenta only

placenta as well as fully developed foetus

oxytocin released from maternal pituitary

fully developed foetus only