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Why does a white paper appear white, when light is not to
fall on it ?
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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 ?
Fresh form of water is obtained from?
Which substance has the highest specific heat ?
What is determining factor in the oxidation reduction reaction?
Mention a few application of cod test in environmental engineering practice.
Why does water boil above 100 o C in mines ?
When carbon is made to burn in an atmosphere of oxygen, what is produced ?
what is the process for separating the components of gunpowder?
Explain about Match Industry ?
Why are wires used to carry electricity ?
We see the sun before it rises above the horizon in the morning. Why?
What is photoelectric colorimeter?
Organic Chemistry 
