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What color is the sky?

blue

Explanation:

A cloudless sky in the daytime, appears blue to the human eye. The reason why sky looks blue during the day is because when the sun rays hit the atmosphere they get scattered into their constituent colors and it's the blue color that scatters the most so we see that the sky is largely blue.

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sonar - device which is used to find the submit submarines, sankalp ship. sonar waves consists of a transmitter and detector which are installed in the observation centre on board of a ship. the ultrasonic waves are sent into the sea at high frequency about 1000 khz in all direction.