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Test # 365 [01-Jul-2018]


1.
The one big fear of all world economies is that of ________ .

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  • Science Experiments Ideas

    Gas pipe

    Roll a thin piece of tin foil round a pencil to make a tube about four inches long, and hold it with one end in the middle of a candle flame. If you hold a burning match at the other end of the tube, a second flame will be lit there.
    Like all solid and liquid fuels, stearin produces combustible gases when heated, and these accumulate inside a flame. They burn, with the oxygen of the air, in the outer layer and tip of the flame. The unburnt stearin vapour in the middle can be drawn off, like town gas from the gas works.


    Chourishi Systems