Polythene is industrially prepared by the polymerisation of
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According to Daltons atomic theory the smallest particle which can exist independently is
One fathom is equal to
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Lightening cause rainfall because
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Apparatus invented by Archimedes is :
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Cell membrane is
The metal that is present in Photo Films is
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The removal of top soil by water or wind is called
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Glass is made from the mixture of
Which of the following elements is non-radioactive?
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Quartz crystals normally used in quartz clocks etc. is chemically
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