Physics
Which of the following is arranged in order of decreasing conductivity?

Aluminium, Silver, Copper, Steel
Copper, Silver, Aluminium, Steel
Copper, Aluminium, Steel, Silver
Silver, Copper, Aluminium, Steel

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Physics
A balloon filled with hydrogen will

Reach a particular height and remain floating
Continue going upwards uninterrupted
Burst after reaching some height
Reach a particular height and start coming down

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