Which of the following is used as a lubricant?
Graphite
Silica
Iron Oxide
Diamond
Additional Questions
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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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Among the various allotropes of carbon, |
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The group of metals Fe, Co, Ni may best called as |
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Heavy water is |
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