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Q. Potassium nitrate is used in
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Q. Which type of waves used by radar for detecting the presence of aircraft?
Q. If all bullets could not be removed from gun shot injury of a man, it may cause poisoning by
Q. Plants differ from animals in having
Q. In which of the following era began the Self replicating RNA molecules on Earth ?
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Q. The age of most ancient geological formations is estimated by
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