Physics
One should not connect a number of electrical appliances to the same power socket because

this can damage the appliances due to overloading
this can damage the electrical meter
this can damage the domestic wiring due to overloading
the appliance will not get full voltage

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Physics
Why two thin shirts can keep us warmer than a single thick shirt in winter ?

Air layer between two shirts works as good conductor
No radiation of heat takes place
Two thin shirts become thicker so prevent transmission of heat
Air layer between two shirts behaves like insulating media

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Physics
A standing wave occurs when

A wave reflects upon itself
Two waves overlap
The speed of the wave is zero or near zero
The amplitude of a wave exceeds its wavelength

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