The hardest substance available on earth is
Gold
Iron
Diamond
Platinum
The hardest substance available on earth is
The variety of coal in which the deposit contains recognisable traces of the original plant material is |
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Tetraethyl lead is used as |
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Which of the following is used as a lubricant? |
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The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is |
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The gases used in different types of welding would include |
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The property of a substance to absorb moisture from the air on exposure is called |
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In which of the following activities silicon carbide is used? |
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The average salinity of sea water is |
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When an iron nail gets rusted, iron oxide is formed |
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Galvanised iron sheets have a coating of |
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