The filament of an electric bulb is made of
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Carbon, diamond, and graphite are together called
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Galvanised iron sheets have a coating of
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What is the purpose of adding baking soda to dough?
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An element that does not occur in nature but can be produced artificially is
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Which of the following pairs is not correctly matched?
| |
Mineral |
|
Industrial use |
| (a) |
Zirconium |
- |
Nuclear reactor |
| (b) |
Manganese |
- |
Dry battery |
| (c) |
Mica |
- |
Bleaching powder |
| (d) |
Bauxite |
- |
Tanning |
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The element found on the surface of the moon is
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The average salinity of sea water is
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The metallic constituents of hard water are
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The high temperature superconductors are
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The variety of coal in which the deposit contains recognisable traces of the original plant material is
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Which of the following is the important ore of magnesium?
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An atom of an element with mass number 23 and atomic number 11 will have
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In vulcanisation, natural rubber is heated with
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Which of the following is used as a filler in rubber tyres?
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Which one of the following fertilisers has more nitrogen content?
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Dialysis is used for people with defective kidneys. It involves the process of
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Which of the following compounds are responsible for "acid rain"?
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The substance coated on plastic tape-recorder tapes is
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