| 1. | Which one of the following is used for making pencil lead ? | |
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Diamond
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None
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Graphite
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Sulphur
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Report Question| 2. | Which of the following element is a metalloid ? | |
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Calcium
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Carbon
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Silicon
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Nitrogen
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| 3. | The metal liquid at room temperature is ? | |
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Sodium
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Mercury
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Aluminium
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Copper
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| 4. | In extraction of copper, the flux used is ? | |
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FeSiO3
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FeO
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SiO2
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CaO
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| 5. | Which of the following is the correct arrangement of the given metals in ascending order of their reactivity Zinc, Iron, Magnesium, Sodium ? | |
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Sodium > Magnesium > Zinc > Iron
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Sodium > Zinc > Magnesium > Iron
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Zinc > Iron > Magnesium > Sodium
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Sodium > Magnesium > Iron > Zinc
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| 6. | Annealing is done to ? | |
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increase brittleness
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increase Transparancy
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decrease brittleness
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increase refractive inded
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| 7. | Soda Acid for extinguisher contains ? | |
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sodium chloride and sulphuric acid
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sodium carbonate and carbonic acid
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sodium carbonate and nitric acid
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sodium hydrogen carbonate and sulphuric acid
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| 8. | Which one of the following is used for making pencil lead ? | |
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Diamond
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Graphite
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Sulphur
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None
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| 9. | Which of the following metal cannot displaced hydrogen ? | |
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Gold
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Silver
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Copper
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All of these
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| 10. | Hard glass is prepared by ? | |
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fusing a mixture of potassium carbonate and any oxide
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fusing a mixture of sodium carbonate, calcium carbonate and silica
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fusing a mixture of potassium carbonate, calcium carbonate and silica
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none of the above
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