Science and technology Quiz 2
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Composing about 78 percent of the air at sea level, what is the most common gas in the Earth's atmosphere? a) Oxygen b) Nitrogen c) Carbon dioxide
b) Nitrogen
Who invented the aeroplane ? a) James Watt b) Amelia Earhart c) Wright brothers
c) Wright brothers
What is the element present on lead pencils? a) Carbon b) Lead c) Zinc
a) Carbon
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