While standing on railway platform and heating the whistle of an engine coming towards us , we hear the sound increasing; bit when the engine is receding from us it appears to fall why ?

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Explain about Graham?s law of Diffusion ?

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How is food preserved ?

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Why does the filament of an electric lamp glow, when current passes through it ?

2 Answers   Apple,

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Why are substances like caustic soda and calcium chloride called hygroscopic substances ?

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Define what is avogadro’s law?

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Explain the Atom?

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Which metal is used for coating the backs of the mirrors ?

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Does domestic/household used kerosene oil which is available in blue color (In India) can change its color over the due course of time say 8-10 years if keeping in plastic bottle? If so, in which color it will be turned to change, yellow or transparent or any other color. Please provide me the reply with strong technical approach. Since it has been asked during an interview. Please reply fast. I will be thankful to you if anyone can provide the supporting journals/write-ups/reference to favour of response.

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What is glacial acetic acid?

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Why is acetic acid added?

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Why metallic tools used by blacksmiths have wooden handles ?

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