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Q. The highest volume of gases in lower atmosphere is comprised of
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Q. A scientist from USA discovered 'BISIN', which
Q. The most important ore of lead is
Q. Who among the following proved that Bacteria don’t originate by spontaneous generation?
Q. The alum used for purifying water is
Q. A bomb explodes on the Moon. How long will it take for the sound to reach the Earth?
Q. Exposure to sunlight helps a person improve his health because:
Q. Which of the following determines the chemical properties of an element?
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