Electric Circuits
A piece of copper and another piece of germanium are cooled from room temperature to 80K. The resistance of

 each of them decreases.
 copper decreases and germanium increases.
 copper increases and germanium decreases.
 each of them increases.

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Electric Circuits
Two electric bulbs have transparent filament of same thickness. It one of them gives 60 W and other gives 100 W, then-

 60 W lamp filament has longer length.
 60 W lamp filament has shorter length.
 60 W and 100 W lamp filament have equal length.
 100 W lamp filament has longer length.

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