World Water Day Quiz
How many known sources of fresh water are there?
When is world water day celebrated every year?
What percentage of the water on earth is fresh water?
Which one of the two uses most amount of water in the developed countries?
Who uses more water Developed country's household usage or developing?
World Water Day Quiz
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Underwater vehicles Quiz
Which submersible is certified to go any depth in the ocean (full ocean depth) at present?
Which of these is also a submersible?
Are all underwater vehicles called submarine?
What is a submarine ?
What is the name of the submersible that found RMS Titanic ship ?
Underwater vehicles Quiz
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